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Senior Agentic Software Engineer

Full-time

ST6 Partners

Role Description

This is a production-focused engineering role for a senior Java developer who works agentically by default. You will deliver AI-augmented features, modernizations, and new capabilities across our Java/Python/AWS stack. You will also pair with existing engineers to transfer agentic working habits — not by lecturing, but by working together on real problems.

Please note:

  • Applicants must be authorized to work for any employer in the United States, including for any future work authorization needs (such as OPT/CPT). We are unable to sponsor or take over sponsorship of an employment visa at this time.

Key Responsibilities

  • Deliver production features and modernization work across our Java/Python/AWS stack using AI-augmented development as your primary mode of authorship.
  • Pair with existing engineers to build agentic practice organically through working sessions on real deliverables, not classroom instruction.
  • Participate in AI-augmented PR reviews while contributing to pattern libraries and review checklists.
  • Own production systems end-to-end: ship real things, stay accountable when they break, and close the loop.
  • Bring concrete judgment about when to let an agent run and when to intervene — and share that judgment with the team.

Qualifications

  • 5–9 years of professional software engineering experience.
  • Strong fluency in Java, with solid working knowledge of Python on AWS. This is a Java-specialized seat.
  • 6+ months of serious agentic tool use (Claude Code, Cursor, or equivalent) on production work, not pilots or side projects.
  • Production ownership history: you have shipped non-trivial systems and been on the hook when they broke.
  • At least one out-of-depth experience: a stack switch, domain change, or greenfield build in unfamiliar territory. You know what it feels like to be uncomfortable and productive at the same time.
  • The ability to catch non-obvious agent errors and concrete heuristics for when to trust output and when to verify.

Strong Plus

  • Experience with financial services, institutional investment platforms, or other high-correctness, regulated software domains.
  • Familiarity with brownfield modernization: improving existing systems with agents rather than rewriting them.
  • Background integrating or reviewing work you did not personally author.

Interview Process

We want this to be a great fit for both sides. After applying, you'll complete a short set of aptitude and personality assessments before connecting with a recruiter. Everyone goes through them, from interns to our CEO. The invitation will come from a member of our recruiting team — keep an eye on your inbox and check your spam folder just in case.

Vacancy posted 10 hours ago
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