Principal Software Engineer

<div class="content-intro"><p> </p> <div> <h2><strong>Company Overview</strong></h2> </div> <div> <p>Arcesium is a global financial technology firm that solves complex data-driven challenges faced by some of the world’s most sophisticated financial institutions. We constantly innovate our platform and capabilities to meet tomorrow’s challenges, anticipate the risks our clients encounter, and design advanced solutions to help our clients achieve transformational business outcomes.   </p> </div> <p>Financial technology is a high-growth industry as change and innovation continue to disrupt the status-quo and prompt major transformation. Arcesium is at a particularly interesting time in our own growth as we look to leverage our successfully established market position and expand operations in pursuit of strategic new business opportunities. We value intellectual curiosity, proactive ownership, and collaboration with colleagues, and we empower you to meaningfully contribute from day one and accelerate your professional development.</p></div><p> </p> <p class="font-claude-response-body break-words whitespace-normal leading-[1.7]"><strong>Team Summary</strong></p> <p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">We're looking for a Principal Software Engineer who keeps a large, distributed platform fast, stable, and efficient as load and complexity grow. This is a role based in our Stockholm office, embedded in a team that owns and operates what it builds.</p> <p class="font-claude-response-body break-words whitespace-normal leading-[1.7]"><strong>What You'll Do</strong></p> <ul class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3"> <li class="font-claude-response-body whitespace-normal break-words pl-2">Own projects end-to-end from an architectural standpoint - driving them independently from requirement-gathering through design, delivery, and operation, with minimal oversight.</li> <li class="font-claude-response-body whitespace-normal break-words pl-2">Gather and validate requirements, translate them into high-level and low-level designs, and raise the quality bar on designs produced by others.</li> <li class="font-claude-response-body whitespace-normal break-words pl-2">Make, document, and review architectural decisions, articulating trade-offs clearly to both technical and non-technical stakeholders.</li> <li class="font-claude-response-body whitespace-normal break-words pl-2">Own non-functional attributes - performance, stability, scalability, an