Senior Software Engineer Jobs in London, UK

<div class="content-intro"><h4><strong>Join Axon and be a Force for Good.</strong></h4> <p>At Axon, we’re on a mission to Protect Life. We’re explorers, pursuing society’s most critical safety and justice issues with our ecosystem of devices and cloud software. Like our products, we work better together. We connect with candor and care, seeking out diverse perspectives from our customers, communities and each other.<br><br>Life at Axon is fast-paced, challenging and meaningful. Here, you’ll take ownership and drive real change. Constantly grow as you work hard for a mission that matters at a company where you matter.</p></div><h4></h4> <h3>Your Impact</h3> <p>As a Senior Software Engineer II on Dedrone’s Infrastructure Services team, you will design, build, and evolve the core systems that power both our developer platform and key backend services. You will combine strong software engineering fundamentals with deep infrastructure expertise to ensure our platform is scalable, reliable, and secure. This role goes beyond operating infrastructure—you will build production-grade backend services, design cloud-native systems, and own the CI/CD and runtime environments that support our product ecosystem. You will influence engineering standards, developer experience, and architectural direction across Dedrone’s product teams.</p> <h3>What You’ll Do</h3> <p><strong>Work Location:</strong> This role is based out of our London office and follows a hybrid schedule. We rely on in-person collaboration and ask that team members work onsite Tuesdays through Fridays, with the flexibility to work remotely on Mondays, unless there is an approved workplace accommodation. We believe that connection fuels innovation, and our in-office culture is designed to foster meaningful teamwork, mentorship, and shared success.<br><strong>Reports to:</strong> Engineering Manager, Infrastructure Services</p> <p><strong>Backend & Platform Service Engineering</strong></p> <ul> <li>Design, build, and maintain production-grade backend services (primarily Java, Go, or Python) that power deployment orchestration, internal APIs, and developer platform capabilities.</li> <li>Contribute to architectural decisions including service boundaries, API design, persistence layers, scalability strategies, and fault tolerance.</li> <li>Improve performance, reliability, and maintainability of platform-owned services through strong testing practices and thoughtful system design.</li> <li>Maintain and evolve shared services owned by the Infrastructure Services team.</li> </ul> <p><strong>CI/CD & Developer Platform</strong></p> <ul> <li>Own, design, and optimize CI/CD systems supporting Dedrone’s distributed pr

<div class="content-intro"><h4><strong>Join Axon and be a Force for Good.</strong></h4> <p>At Axon, we’re on a mission to Protect Life. We’re explorers, pursuing society’s most critical safety and justice issues with our ecosystem of devices and cloud software. Like our products, we work better together. We connect with candor and care, seeking out diverse perspectives from our customers, communities and each other.<br><br>Life at Axon is fast-paced, challenging and meaningful. Here, you’ll take ownership and drive real change. Constantly grow as you work hard for a mission that matters at a company where you matter.</p></div><h3></h3> <h3>Your Impact</h3> <p>As a Senior Software Engineer on Dedrone’s Infrastructure Services team, you will design, build, and evolve the core systems that power both our developer platform and key backend services. You will combine strong software engineering fundamentals with deep infrastructure expertise to ensure our platform is scalable, reliable, and secure. This role goes beyond operating infrastructure—you will build production-grade backend services, design cloud-native systems, and own the CI/CD and runtime environments that support our product ecosystem. You will influence engineering standards, developer experience, and architectural direction across Dedrone’s product teams.</p> <h3>What You’ll Do</h3> <p><strong>Work Location:</strong> This role is based out of our London office and follows a hybrid schedule. We rely on in-person collaboration and ask that team members work onsite Tuesdays through Fridays, with the flexibility to work remotely on Mondays, unless there is an approved workplace accommodation. We believe that connection fuels innovation, and our in-office culture is designed to foster meaningful teamwork, mentorship, and shared success.<br><strong>Reports to:</strong> Engineering Manager, Infrastructure Services</p> <p><strong>Backend & Platform Service Engineering</strong></p> <ul> <li>Design, build, and maintain production-grade backend services (primarily Java, Go, or Python) that power deployment orchestration, internal APIs, and developer platform capabilities.</li> <li>Contribute to architectural decisions including service boundaries, API design, persistence layers, scalability strategies, and fault tolerance.</li> <li>Improve performance, reliability, and maintainability of platform-owned services through strong testing practices and thoughtful system design.</li> <li>Maintain and evolve shared services owned by the Infrastructure Services team.</li> </ul> <p><strong>CI/CD & Developer Platform</strong></p> <ul> <li>Own, design, and optimize CI/CD systems supporting Dedrone’s distributed produ

<div class="content-intro"><h4><strong>Join Axon and be a Force for Good.</strong></h4> <p>At Axon, we’re on a mission to Protect Life. We’re explorers, pursuing society’s most critical safety and justice issues with our ecosystem of devices and cloud software. Like our products, we work better together. We connect with candor and care, seeking out diverse perspectives from our customers, communities and each other.<br><br>Life at Axon is fast-paced, challenging and meaningful. Here, you’ll take ownership and drive real change. Constantly grow as you work hard for a mission that matters at a company where you matter.</p></div><p><strong>Your Impact</strong></p> <p>As a Senior Software Engineer II in Forensic Intelligence, you'll use your deep technical skills and knowledge to shape the architecture and technical direction for the systems that enable public safety agencies to investigate, analyse, and trust video evidence at scale. You'll drive initiatives spanning media processing pipelines, browser-native forensic tools, and enabling novel video formats to be playable on our platform. You'll design systems that serve hundreds of thousands of users globally. You'll work closely with a growing team of engineers, help establish the technical quality bar, and partner closely with product and engineering leadership to deliver against the long-term vision for forensic capabilities within Evidence.com.<br><br></p> <p><strong>Work Location: </strong>This role is based out of our London office and follows a hybrid schedule. We rely on in-person collaboration and ask that team members work onsite Tuesdays through Fridays, with the flexibility to work remotely on Mondays, unless there is an approved workplace accommodation. We believe that connection fuels innovation, and our in-office culture is designed to foster meaningful teamwork, mentorship, and shared success.<br><br></p> <h4>What You'll Do</h4> <p><strong>Location: London, United Kingdom<br>Reports to: Director of Engineering, DEMS UK<br></strong></p> <ul> <li>Take ownership for the building and delivering advanced capabilities for Video Forensics, spanning media processing pipelines, forensic playback, investigation tooling, and video format R&D</li> <li>Design systems that span multiple applications and services, ensuring they scale, remain operable, and evolve gracefully over time</li> <li>Drive cross-team design reviews, ensuring consistent technical quality and alignment across independently operating teams</li> <li>Take contradictory, incomplete, or ambiguous requirements and turn them into coherent technical direction that the team can execute against</li> <li>Continuously raise the team’s quality bar throu

<div class="content-intro"><h4><strong>Join Axon and be a Force for Good.</strong></h4> <p>At Axon, we’re on a mission to Protect Life. We’re explorers, pursuing society’s most critical safety and justice issues with our ecosystem of devices and cloud software. Like our products, we work better together. We connect with candor and care, seeking out diverse perspectives from our customers, communities and each other.<br><br>Life at Axon is fast-paced, challenging and meaningful. Here, you’ll take ownership and drive real change. Constantly grow as you work hard for a mission that matters at a company where you matter.</p></div><h3>Your Impact</h3> <p>This role is for builders who thrive in 0→1. In Axon’s Global Artificial Intelligence pillar, you’ll build a stealth product with a small team and a big mission: deliver something the market hasn’t seen, and do it with pace.<br><br>As a Senior Software Engineer I, you’ll lead key areas of the product from concept through launch. You’ll make pragmatic architecture decisions, keep quality high while moving fast, and help the team turn prototypes into a scalable product.<span class="Apple-converted-space"> </span><br><br>This is an AI-native delivery role: AI is a primary lever for how you ship, not an add-on and you have true Product acumen and ability to craft and build products end to end. <em><br></em></p> <h3>What You’ll Do</h3> <ul> <li>Lead the build of major product surfaces and services; own features end-to-end from design to operations.</li> <li>Drive product clarity in ambiguity: define the problem, shape MVP scope, set success metrics, and align stakeholders on what “done” means.</li> <li>Build and ship software AI-natively across the SDLC (planning, implementation, testing, code review, debugging, and operations), with clear validation practices to maintain correctness and quality.</li> <li>Measure and improve delivery outcomes using engineering metrics (lead time, PR throughput, defect rates, test coverage, incident load) and iterate on how the team ships.</li> <li>Make architecture choices that balance speed and scalability—knowing when “temporary” becomes “permanent.”</li> <li>Build and enforce engineering hygiene that doesn’t slow you down (testing strategy, CI/CD, observability, sensible release practices).</li> <li>Partner tightly with Product and Design (and operate effectively when they’re not in the room) to prioritise, sequence, and ship the highest-value increments.</li> <li>Mentor engineers and help establish a high-trust, high-ownership culture.</li> </ul> <p><strong>Work Location: </strong>This role is based out of our London office and follows a hybrid schedule. We rel

<div class="content-intro"><h4><strong>Join Axon and be a Force for Good.</strong></h4> <p>At Axon, we’re on a mission to Protect Life. We’re explorers, pursuing society’s most critical safety and justice issues with our ecosystem of devices and cloud software. Like our products, we work better together. We connect with candor and care, seeking out diverse perspectives from our customers, communities and each other.<br><br>Life at Axon is fast-paced, challenging and meaningful. Here, you’ll take ownership and drive real change. Constantly grow as you work hard for a mission that matters at a company where you matter.</p></div><h3>Your Impact</h3> <p>As a senior engineer on the team, you will be intimately involved in architecture decisions that shape this product. You live and breathe cloud services that require high availability and fast, consistent performance.<br><br>You operate in an AI-first engineering environment, where you leverage advanced AI systems to inform design decisions, accelerate development, and improve system reliability. You are expected to drive adoption of AI-enabled engineering practices across teams, ensuring scalable and efficient development workflows.<br><br>You will work closely with product managers and designers to ensure we are building the right solution for our customers, while also mentoring engineers on both system design and AI-first development practices.</p> <h3>What You’ll Do</h3> <p><strong>Work Location: </strong>This role is based out of our London office and follows a hybrid schedule. We rely on in-person collaboration and ask that team members work onsite Tuesdays through Fridays, with the flexibility to work remotely on Mondays, unless there is an approved workplace accommodation. We believe that connection fuels innovation, and our in-office culture is designed to foster meaningful teamwork, mentorship, and shared success.<br><br></p> <ul> <li>Lead engineering architecture design reviews, incorporating AI-driven insights and system modeling</li> <li>Set a high technical bar through code and architecture reviews, including evaluation of AI-generated code and patterns</li> <li>Mentor engineers on scalable system design and AI-first development practices</li> <li>Drive adoption of AI-assisted development tools and workflows across the engineering organization</li> <li>Work across teams with Product, Design, and Engineering to create integrated solutions</li> <li>Improve engineering processes by embedding automation, AI tooling, and intelligent workflows into planning and execution</li> <li>Build services that adhere to high standards on availability and latency in a mission-critical environment</li> <li>Leverage AI systems to optimize performance

Senior Software Engineer at Swap. Apply via Ashby.

Senior Software Engineer at Causaly. Apply via Ashby.

Senior Software Engineer (Full Stack) at Humaans. Apply via Ashby.

Senior Software Engineer - Time - London at Personio. Apply via Ashby.

<div class="content-intro"><h2>Our Mission</h2> <p>At Ophelos, we believe in a different way to deal with debt. One that puts empathy and understanding front and centre, approaching our customers as individuals — no matter what they’re going through.</p> <p>For too long, people in debt have borne the brunt of poor industry practices. Intimidating tactics, time-consuming customer service and a one-size-fits-all approach that overlooks the reasons <em>anyone</em> can fall into debt in the first place. Meanwhile, businesses suffer too. Poor customer experience translates to poor customer satisfaction, high churn rates, bad brand reputation and ultimately missed opportunities.</p> <p>That’s why we’re taking a radically different approach. Pioneering an industry-first AI-native collections platform, we build products that help individuals clear their debts in a way that suits them, whilst providing businesses with an improved customer experience and game-changing insights into their customer base.</p> <p>Since our launch in 2021, we’ve worked with some of the UK’s leading companies, including Octopus, Scottish Power and Philips — helping millions of people move toward a more stable, debt-free future. In 2023, we were acquired by Intrum, Europe’s biggest credit management service and have begun the next phase in our growth — expansion into 17 European markets over the next two years.</p></div><h2>Senior Software Engineer (Full Stack) </h2> <p>We are seeking an enthusiastic and ambitious Senior Software Engineer with a keen eye for quality to join our growing Engineering function. You will be joining our Payments squad, responsible for building out our cross-market flexible Payments capability. This is a team which has recently transitioned to being “LLM-first” in their working style, so you would be joining at a critical moment to shape our ways of working and our approaches to LLM-based tooling. </p> <p>In this role, you’ll get to:</p> <ul> <li><strong>Design,</strong> implement and deliver software features with full ownership from start to finish.</li> <li><strong>Collaborate</strong> as part of a close & multi-disciplinary team. Your work will have meaningful and measurable impact on our organisation and products</li> <li><strong>Own</strong> business-critical components and ensure their stability and maintainability</li> <li><strong>Mentor</strong> other members of the team to ensure technical excellence and continuously raise the bar when it comes to engineering standards.</li> <li><strong>Share</strong> your ideas with the team and build products that make an incredibly impactful difference to society and people’s lives</li> </ul> <p>Ophelos Tech is an AI-f

<div class="content-intro"><h2>The Company You’ll Join</h2> <p>Carta connects founders, investors, and limited partners through world-class software, purpose-built for everyone in venture capital, private equity and private credit. Trusted by 65,000+ companies in 160+ countries, Carta’s platform of software and services lays the groundwork so you can build, invest, and scale with confidence.</p> <p>Carta’s Fund Administration platform supports 9,000+ funds and SPVs, representing nearly $185B in assets under management, with tools designed to enhance the strategic impact of fund CFOs. Recognized by Fortune, Forbes, Fast Company, Inc. and Great Places to Work, Carta is shaping the future of private market infrastructure.</p> <p>Together, Carta is creating the end-to-end ERP platform for private markets. Traditional ERP solutions don’t work for Private Funds. Private capital markets need a comprehensive software solution to replace outdated spreadsheets and fragmented service providers. Carta’s software for the Office of the Fund CFO does just that - it’s a new category of software to make private markets look more like public markets - a connected ERP for private capital. </p> <p>For more information about our offices and culture, check out our <a href="https://carta.com/careers/">Carta careers page</a>.</p></div><h2><strong>The Team You'll Work With</strong></h2> <p>You’ll enter our engineering interview process as part of a pooled hiring model. We’re excited to meet people who are energized by complex, ambiguous problems. We look for owners and problem-solvers who are eager to dive into the details of their craft, and are motivated by building products and experiences that meaningfully expand access to ownership. </p> <p>As you move through our process, we’ll transition from the general pool to a team-matching phase, ensuring that by the final interview, you are aligned with a specific team that matches your strengths and career goals. </p> <p><strong>High impact domains you might join include:</strong></p> <ul> <li><strong>Integrated CRM & ERP Solutions: </strong>Defining and delivering our next-generation CRM as part of a fully integrated ERP for private capital. You’ll build deep, greenfield product and data integrations at the heart of the platform, shaping a system that unifies front-office intelligence with financial and operational workflows. You’ll work closely with the founder of the CRM Product that <a href="https://carta.com/blog/listalpha-acquisition/">Carta has acquired. </a></li> <li class="p1"><strong>International Fund Administration:</strong> Building and scaling Carta's FA platform for all markets outside the US, adap

<p><strong>WHO WE ARE </strong></p> <p>Zeta Global (NYSE: ZETA) is the AI-Powered Marketing Cloud that leverages advanced artificial intelligence (AI) and trillions of consumer signals to make it easier for marketers to acquire, grow, and retain customers more efficiently. Through the Zeta Marketing Platform (ZMP), our vision is to make sophisticated marketing simple by unifying identity, intelligence, and omnichannel activation into a single platform – powered by one of the industry’s largest proprietary databases and AI. Our enterprise customers across multiple verticals are empowered to personalize experiences with consumers at an individual level across every channel, delivering better results for marketing programs. Zeta was founded in 2007 by David A. Steinberg and John Sculley and is headquartered in New York City with offices around the world. To learn more, go to <a href="https://www.zetaglobal.com">www.zetaglobal.com</a>.</p> <p><strong>The Role</strong></p> <p>As a Senior Software Engineer you will provide technical leadership to the group responsible for architecting, developing, and owning Addressability part of the Zeta Marketing Platform. You will collaborate with Engineers, Product Managers and Executives across the organization to develop a roadmap and subsequent projects to build the next generation comprehensive, multichannel marketing solution that unifies and unlocks data across digital touch points, driving return on marketing investment. </p> <p><br>This position will be responsible for the design and development of realtime systems of The Zeta Marketing Platform and LiveIntent, working on technology that enables access to core of Identity Solutions. You will mentor an organization of developers through your knowledge sharing sessions that will guide and strengthen their knowledge.<br>You should have a deep knowledge of distributed systems and cloud architecture. You will need extensive design and development experience and passion about working with large amounts of data and designing reliable low-latency data processing systems. </p> <p><span data-teams="true">This is a hybrid role based out of our London, UK office</span></p> <p><strong>Essential Responsibilities:</strong></p> <p>As a Senior Software Engineer, your responsibilities will include:</p> <ul> <li>Building, refining, tuning, and maintaining our real-time infrastructure</li> <li>Designing, developing and maintaining services responsible for data collection and real-time data processing</li> <li>Working with Product Managers to design and build data products</li> <li>Working with our DevOps team to scale and optimize our infrastructure</li> <li>Participate in architecture discussions, influen

<p><strong>WHO WE ARE </strong></p> <p>Zeta Global (NYSE: ZETA) is the AI-Powered Marketing Cloud that leverages advanced artificial intelligence (AI) and trillions of consumer signals to make it easier for marketers to acquire, grow, and retain customers more efficiently. Through the Zeta Marketing Platform (ZMP), our vision is to make sophisticated marketing simple by unifying identity, intelligence, and omnichannel activation into a single platform – powered by one of the industry’s largest proprietary databases and AI. Our enterprise customers across multiple verticals are empowered to personalize experiences with consumers at an individual level across every channel, delivering better results for marketing programs. Zeta was founded in 2007 by David A. Steinberg and John Sculley and is headquartered in New York City with offices around the world. To learn more, go to <a href="https://www.zetaglobal.com">www.zetaglobal.com</a>.</p> <h2> </h2> <h3><strong>THE ROLE</strong></h3> <p>As a Senior Software Engineer on the LiveIntent Real-Time Ad Serving team, you will design, develop, and own the business logic that powers programmatic advertising at scale — ad selection, targeting, frequency capping, budget pacing, and delivery optimization.</p> <p>The real-time platform is built on C++ and Lua: C++ provides the high-performance server framework, while Lua implements the business logic layer. You will work primarily in Lua, developing and evolving the features that directly serve LiveIntent's product — ensuring advertisers get the best outcomes and publishers maximize their revenue. While we're open to candidates with experience in any backend language, a willingness to work with Lua is essential — we provide time and the right environment to get up to speed.</p> <p>You will collaborate closely with Product, working on features that directly impact LiveIntent's customers — from ad targeting and delivery to reporting and optimization. This is a hands-on engineering role where your code runs in production handling billions of daily transactions.</p> <p>This is a hybrid/remote role based out of our Berlin, Germany or Prague, Czech Republic offices.</p> <h3><strong>ESSENTIAL RESPONSIBILITIES</strong></h3> <ul> <li>Develop and optimize business logic in Lua for ad selection, targeting, frequency capping, and budget pacing</li> <li>Design, build, and maintain real-time services processing 200K+ requests per second with strict latency requirements</li> <li>Work closely with Product to deliver features that meet advertiser and publisher needs</li> <li>Ensure code quality through code reviews, automated testing, and continuous integration</li> <li>Participate in architecture discussions and influence the

Senior software engineer (Node.js/TypeScript) at Seccl. Apply via Ashby.

<p>As a <strong>Senior Software Engineer</strong>, you will be part of one of our autonomous agile teams. You will help us develop the services that power the Blacklane, work on improving our back-office system, or solve problems around our products which allow business partners to integrate with the Blacklane platform.</p> <p><br><strong>Our environment</strong> is composed of Ruby, Go, Typescript and Java services, designed using DDD. These services are deployed to our Kubernetes cluster and communicate via domain events using SQS and Kafka. We use diverse data storage technologies such as Postgres, MySQL, Elasticsearch, Redis, and DynamoDB. As for infrastructure and cloud resources, we predominantly use AWS and manage provisioning through Terraform.<br><br></p> <h3 class="col-md-6 pull-left">YOUR CHALLENGE:</h3> <div class="col-md-6 pull-left"> <div class="border"> <ul> <li>Tackling unique challenges to tailor our products to specific markets.</li> <li>Upholding high standards through comprehensive test coverage, documentation, code reviews, and knowledge sharing.</li> <li>Investing time in optimizing the performance, usability, and maintainability of the systems under your care.</li> <li>Committing to personal growth by learning new skills and technologies.</li> <li>Contributing to a motivated, open-minded, and collaborative team focused on enhancing our guests' travel experiences.</li> </ul> <h3> </h3> <h3>ABOUT YOU:</h3> <ul> <li>You are proactive, curious, and a team player.</li> <li>You are experienced (at least 5 years) with two or more programming languages.</li> <li>You have knowledge and experience (at least 5 years) with at least one of these languages: Ruby, Go</li> <li>You're familiar with the HTTP protocol and have some experience with using and/or developing REST APIs.</li> <li>You write quality code, maintainable and follow best practices. You are familiar with at least some of the challenges of distributed systems. You are not scared of working on an existing codebase.</li> <li>You have experience with or want to learn more about Event-driven architecture and domain driven design.</li> <li>You have experience with Docker and containerized environments. Knowledge of Kubernetes and Terraform is a plus.</li> </ul> </div> </div> <div class="p-rich_text_section"> <div class="p-rich_text_section"> <div class="col-md-6 pull-left"> <div class="col-md-6 pull-left"> </div> </div> <p style="text-align: left;"> </p> <h4><a href="https://www.blacklane.com/en/">About Blac

Senior Software Engineer at Socure. Apply via Ashby.

<p><strong>About Tripadvisor</strong></p> <p>The Tripadvisor Group connects people to experiences worth sharing, and aims to be the world’s most trusted source for travel and experiences. We leverage our brands, technology, and capabilities to connect our global audience with partners through rich content, travel guidance, and two-sided marketplaces for experiences, accommodations, restaurants, and other travel categories. The subsidiaries of Tripadvisor, Inc. (Nasdaq: TRIP), include a portfolio of travel brands and businesses, including Tripadvisor, Viator, and TheFork.</p> <p>The Tripadvisor Experiences Engineering team is distributed across Europe and is responsible for Tripadvisor.com, the Tripadvisor mobile apps and all their supporting infrastructure. We run the systems that help operators build their businesses and those which enable third parties to utilise our inventory. We provide the tools which help our customer services team provide world class service to travellers and operators internationally.</p> <p><strong>About the Role</strong></p> <p>We’re looking for a <strong>Senior Software Engineer</strong> to join our fast-growing team. This role is open to candidates based within a commutable distance (generally up to 1.5 hours) of our Oxford office. We embrace flexibility in where and how work gets done and also value meaningful in-person moments to connect and collaborate. You can expect a remote-first working model with periodic in-person gatherings at your closest office for team connection, planning, or other key moments.</p> <p>At Tripadvisor our Engineers are versatile and enjoy working on a variety of technical challenges. This is a full-stack position in which you will be working mostly on the backend with some front end projects from time to time.</p> <p>Within Tripadvisor we have a fun and friendly environment where the key objective is getting things done. Working closely alongside product managers and designers, our engineers are part of the full process from software design, to code, to test, to deployment and back again. Most of our engineers release code to production every few days and we have a daily release cycle.</p> <p>Tripadvisor's web stack includes Java, React, Typescript, GraphQL, Kubernetes, SQL and NoSQL databases, and runs on AWS. You don’t need to have experience with everything listed and will be able to complete coding languages in any language of your choice. You do need to be hungry to learn and will learn our tech stack on the job, if you don't know it already.</p> <p><strong>Perks of Working at Tripadvisor</strong></p> <ul> <li><strong>Competitive compensation packages</strong>, including base salary, annual bonus, and more.</li> <li><strong>“Work your way”</strong> with flexi

Senior Software Engineer, 10 month FTC at Unmind. Apply via Ashby.

Full-Stack Senior Software Engineer at Civicmarketplace. Apply via Ashby.

Senior Software Engineer (Data) at Beamery. Apply via Ashby.