Senior / Staff Fullstack Engineer
Fullstack engineer at Capsa AI, an early-stage startup whose platform uses AI agents to accelerate due diligence for private equity funds. You own features end to end across a Python/FastAPI, Postgres, Elasticsearch, RabbitMQ backend and a TypeScript/React frontend, including LLM agent tooling. London hybrid, 4 days in office.
- Compensation
- Not disclosed
- Location
- London, United Kingdom
- Work setup
- Not specified
- Seniority
- Staff
- Employment
- Not specified
- Experience
- 4+ years
- Category
- Fullstack
- Posted
Skills
Must have
- 4+ years of experience as a software engineer in a venture-backed startup or top tech firm
- Must have the right to work in the UK (no visa sponsorship)
- Experience with Python, FastAPI, Postgres, ElasticSearch, RabbitMQ, LLMs, Typescript, React (or similar)
- Has taken entire products or features from ideation to production and measured their impact
- Comfortable contributing across all layers of the application
Nice to have
- Enjoys diving deep into the domain and focusing on delivering customer value
- Thrives in a fast-paced environment
Full description
At a Glance
Capsa is an AI platform that accelerates due diligence and deepens insights for Private Equity funds. We are hiring Staff / Senior Fullstack Engineers who are comfortable contributing across all layers of the application and developing features end to end.
Details
- Role: Fullstack Engineer
- Location: London, UK (Hybrid, In-Person 4 days a week)
- Experience: Required: 4+ years
- Visa: Unfortunately, we don't sponsor visas yet. You must have the right to work in the UK.
About Capsa AI
At Capsa, we’re on a mission to transform how private capital firms source, analyse, and win deals. Our AI operating system accelerates due diligence, unlocks deeper insights, and helps funds focus on what matters — creating value.
We’re lean, ambitious, and obsessed with building a category-defining company. In just 12 months, we’ve grown ARR by 15x, achieved product–market fit with leading multi-billion-dollar PE firms, and expanded across the US, UK, and Europe. Backed by top VCs and senior PE execs from Warburg Pincus, KKR, and Goldman Sachs, we’re just getting started.
The Role
A senior software engineer at Capsa is expected to own projects and features from conception to production, working across the stack to deliver improvements to our AI platform.
Key responsibilities include:
- Improving our agent's capabilities - design and implement new features that endow our agent with human-level investment expertise.
- Improving connectivity - integrate and incorporate additional data sources into our agent loop, increasing the depth and breadth of the analyses that can be performed.
- Maintaining high code quality - uphold rigorous standards across our codebase, ensuring tech debt doesn't impede our velocity.
Recent projects include:
- Agentic assistant with a finance-focused toolkit and advanced document authoring features
- Scalable document ingestion and indexing pipeline
- In-house, streaming-first agent framework
- AI-assisted document editor
As an early stage startup, working at Capsa will be hard work, it will be messy and at times it will be stressful. However, you will:
- Work directly with our founding team.
- Participate in the upside of an ultra-growth venture.
- Shape the company's vision and will have a direct impact on its success.