[Remote] Senior Software Engineer, Agentic Development

Note: The job is a remote job and is open to candidates in USA. ST6 is a company that builds portfolio management and analytics software for institutional investors and is committed to becoming AI-native by the end of 2025. They are seeking a Senior Software Engineer to join their agentic development team, where the role involves delivering features, operating multi-agent workflows, and ensuring quality in production systems.ResponsibilitiesDeliver features and modernizations across our stack using agentic development end-to-endBuild and operate multi-agent workflows where distinct roles run in parallel and in coordinationWork in brownfield environments with the same discipline as greenfield buildsValidate agent output and know when to intervene — grounded in how well requirements were set upfrontPair with existing engineers to transfer agentic working habits through real production workContribute consistently to sprint delivery and take ownership of quality over timeSkills5–9 years of professional software engineering experienceStrong fluency in Java or Python on AWS, or C# on AzureProduction ownership history: you've shipped non-trivial systems and been accountable when things went wrongAt least one significant out-of-depth experience — a stack switch, a domain change, or a greenfield build in unfamiliar territory6+ months of serious, production-grade agentic tool use (Claude Code, Cursor, or equivalent) — production work only, not pilots or experimentsDemonstrated ability to build product with AI, not just use AI within existing workflowsConcrete understanding of when to let an agent run versus when to intervene, grounded in how well requirements were established before the work startedExperience reviewing and validating work you did not write, including agent-generated outputFamiliarity with building multi-agent frameworks where distinct roles operate concurrentlyCompany OverviewST6 is an experienced team of executives who drive the transformation of software businesses. It was founded in 2017, and is headquartered in Austin, Texas, USA, with a workforce of 2-10 employees. Its website is http://www.st6partners.com/.