[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, backed by Insight Partners. They are seeking a Senior Software Engineer to join their agentic development team, responsible for delivering features and modernizations, building multi-agent workflows, and ensuring quality in production systems.
Responsibilities
- Deliver features and modernizations across our stack using agentic development end-to-end
- Build and operate multi-agent workflows where distinct roles run in parallel and in coordination
- Work in brownfield environments with the same discipline as greenfield builds
- Validate agent output and know when to intervene — grounded in how well requirements were set upfront
- Pair with existing engineers to transfer agentic working habits through real production work
- Contribute consistently to sprint delivery and take ownership of quality over time
Skills
- 5–9 years of professional software engineering experience
- Strong fluency in Java or Python on AWS, or C# on Azure
- Production ownership history: you've shipped non-trivial systems and been accountable when things went wrong
- At least one significant out-of-depth experience — a stack switch, a domain change, or a greenfield build in unfamiliar territory
- 6+ months of serious, production-grade agentic tool use (Claude Code, Cursor, or equivalent) — production work only, not pilots or experiments
- Demonstrated ability to build product with AI, not just use AI within existing workflows
- Concrete understanding of when to let an agent run versus when to intervene, grounded in how well requirements were established before the work started
- Experience reviewing and validating work you did not write, including agent-generated output
- Familiarity with building multi-agent frameworks where distinct roles operate concurrently
Company Overview