Senior Software Engineer
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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 stack
API layer: Go, gRPC, protobufs
Agents & ETL / data pipelines: Python
Frontend: TypeScript + React
Data: 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.
What we're looking for
Required
Strong professional experience building web applications, APIs, and back-end systems (5+ years)
Python or Go experience
Plus strong experience in TypeScript. You don't need all three on day one; we expect you to ramp on the one you know least
Experience with PostgreSQL or similar relational databases technology
Clear written and verbal communication
Experience getting real value out of AI developer tools
Prior startup or small, fast-moving team experience
Nice to have
Experience with Elasticsearch, gRPC/protobufs
Experience building AI agents
Experience with containerization and distributed systems
How we work
Fully remote, US-based, working Eastern hours.
We work hard but we don't burn out. Expect ~45–50 hour weeks. Life happens, and there's real flexibility when it does.
We like each other. We have as much fun as we can while we work, and it's genuinely exciting to watch the business take off.
A straightforward hiring process:
We move fast and we don't beli
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