Senior Fullstack Engineer in London

Senior Fullstack Engineer in London

London Full-Time 60000 - 80000 £ / year (est.) No working from home possible
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At a Glance

  • Tasks: Own projects from conception to production, enhancing our AI platform.
  • Company: Capsa AI, a fast-growing startup transforming private equity with AI.
  • Benefits: Hybrid work model, direct impact on company success, and fast career growth.
  • Other info: Work closely with founders and enjoy a dynamic, fast-paced environment.
  • Why this job: Join a mission-driven team and shape the future of private capital.
  • Qualifications: 4+ years in software engineering with experience in startups or top tech firms.

The predicted salary is between 60000 - 80000 £ per year.

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.

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:

  • 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:

  • Agentic assistant with a finance‑focused toolkit and advanced document authoring features
  • Scalable document ingestion and indexing pipeline
  • In‑house, streaming‑first agent framework

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.

Apply if:

  • 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.

Locations:

  • London, UK - International House, 101 King's Cross Road, WC1X 9LP
  • New York, US - 228 Park Ave S, New York, 10003

Senior Fullstack Engineer in London employer: Capsa AI Ltd

Capsa is an exceptional employer for Senior Fullstack Engineers, offering a dynamic and fast-paced work environment in London. With a strong focus on innovation and growth, employees have the unique opportunity to work closely with the founding team, directly influencing the company's vision and success. The hybrid work model promotes a healthy work-life balance while providing ample opportunities for professional development and career advancement in a rapidly expanding AI platform.

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Contact Details:

Capsa AI Ltd Recruitment Team

StudySmarter Expert Advice🤫

We think this is how you could land Senior Fullstack Engineer in London

Tip Number 1

Network like a pro! Reach out to folks in your industry on LinkedIn or at local meetups. We all know that sometimes it’s not just what you know, but who you know that can help you land that Senior Fullstack Engineer role.

Tip Number 2

Show off your skills! Create a portfolio showcasing your projects and contributions. We love seeing real-world applications of your work, especially if you've taken products from ideation to production.

Tip Number 3

Prepare for those interviews! Brush up on your technical skills and be ready to discuss your experience with Python, FastAPI, and other relevant technologies. We want to see how you think and solve problems!

Tip Number 4

Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we’re excited to find someone who’s as passionate about transforming private capital as we are!

We think you need these skills to ace Senior Fullstack Engineer in London

Python
FastAPI
Postgres
ElasticSearch
RabbitMQ
LLMs
Typescript

Some tips for your application 🫡

Show Your Passion:When you're writing your application, let your enthusiasm for the role and our mission shine through. We want to see that you’re not just looking for any job, but that you’re genuinely excited about transforming private capital with us!

Tailor Your Experience:Make sure to highlight your relevant experience in software engineering, especially if you've worked in a startup or with the technologies we use. We love seeing how your past projects align with what we're doing at Capsa.

Be Clear and Concise:Keep your application straightforward and to the point. We appreciate clarity, so avoid jargon and focus on what makes you a great fit for the Senior Fullstack Engineer role. Remember, less is often more!

Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you don’t miss out on any important updates from our team!

How to prepare for a job interview at Capsa AI Ltd

Know Your Tech Stack

Make sure you’re well-versed in the technologies mentioned in the job description, like Python, FastAPI, and React. Brush up on your knowledge of these tools and be ready to discuss how you've used them in past projects.

Showcase Your End-to-End Experience

Prepare to talk about specific projects where you took features from ideation to production. Highlight the impact of your work and how it contributed to the overall success of the product or company.

Understand Capsa's Mission

Familiarise yourself with Capsa's goals and the role of AI in private equity. Being able to articulate how your skills can help advance their mission will show that you're genuinely interested in the position.

Prepare for a Fast-Paced Environment

Since Capsa is a startup, be ready to discuss how you handle stress and adapt to rapid changes. Share examples of how you've thrived in similar environments and contributed to team success under pressure.