Senior Software Engineer (Full Stack)

The opportunity: We're solving a multi-billion dollar problem: AML/KYC compliance is slow, expensive, and drowning in false positives. Castellum. AI is an all-in-one AI agents and screening platform that cuts false-positive alerts by up to 94% compared to legacy providers, and we're growing fast as new customers come on board. You'll join a growing engineering team and own meaningful projects end to end: data pipelines, our Go API layer, AI agents, and the platform our customers rely on every day. This is a high-agency role for someone who wants to take an ambiguous problem, decide how to solve it, and ship it. What your week actually looks like~1 hour/day in meetings. Standup, sprint planning, retro. We keep it light. The rest of the day is building. Feature work and bug fixes, going from architecture decision to shipped code. You'll use AI/LLMs as a force multiplier but you own the tradeoffs and QA your own changes. Real ownership. You take a project and run with it. You help decide what's in scope, what's out, and where it's okay to cut a corner. On-call. A one-week rotation shared across the team, mostly during ET business hours. We run a modern stack (Docker, Kubernetes, and similar tooling), and you have a dedicated DevOps engineer handling the heavy infrastructure lifting so you can stay focused on building. Our stackAPI layer: Go, gRPC, protobufs Agents & ETL / data pipelines: Python Frontend: TypeScript + ReactData: PostgreSQL, Elasticsearch Who thrives here Our strongest engineers share a few traits: High agency and urgency. They move quickly, take ownership, and understand that getting things done matters. They've worked on small teams that had to ship to survive. Architecture to code. They can write an architecture doc, break the work into manageable chunks, and then build it. Good judgment, including with AI. They use AI tools well without leaning on them blindly. They catch when the model makes the wrong tradeoff and they ship code they understand and stand behind. Clear communicators. They communicate well within engineering (and ideally with customers), understand customer requirements, and will push back on a decision but can disagree and commit.

Stipends: One-time: $350 stipend for home office setup Monthly:$350 coworking,$100 phone,$100 home internet Childcare or petcare when attending work events Annual: up to $5,000 professional development Castellum. AI is building a healthy, respectful, and intellectually rigorous environment. If this sounds like you, we'd love to talk.