Senior / Staff Fullstack Engineer

Antler Co; Greater London; Hybrid; GBP 95,000 - 130,000; Full time

Benefits offered by this job

Private healthcare insurance

One month per year remote working

Home-Office budget

Job summary

Capsa AI in London is seeking a Staff / Senior Fullstack Engineer to own features end-to-end across the stack, from concept to production. You will contribute across the stack to improve our AI platform and data pipelines.

This role requires 4+ years of experience and strong skills in Python, FastAPI, Postgres, and frontend tech (TypeScript/React). Hybrid work with on-site presence in London; visa sponsorship is not available.

Qualifications

• 4+ years of software engineering in venture-backed startups or top tech firms.
• Experience taking features from ideation to production and measuring impact.
• Proficiency with Python, FastAPI, Postgres and frontend tech (TypeScript/React).

Responsibilities

• Own projects from conception to production for Capsa's AI platform.
• Develop features across backend and frontend with emphasis on data pipelines.
• Maintain high code quality and ship iteratively with the team.

Skills

Python

FastAPI

Postgres

Elasticsearch

RabbitMQ

LLMs

TypeScript

React

Job 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.
• Have the opportunity for fast career growth.
• Enjoy yourself!

Apply if

You'll likely be a great fit if most of the following describe you:

• You have 4+ years of experience as a software engineer in a venture backed startup or top tech firm.
• You have taken entire products or features from ideation to production and you've measured their impact.
• You have experience with the following technologies (or similar): Python, FastAPI, Postgres, ElasticSearch, RabbitMQ, LLMs, Typescript, React
• You enjoy diving deep into the domain, understanding the problem, and focusing on delivering value to the customer.
• You thrive in a fast paced environment.

Additional Perks

Alongside the core role and growth opportunity, we also offer:

• Private healthcare insurance.
• One month per year remote working.
• Budget for setting up your Home-Office.