At a Glance
- Tasks: Build and ship production-grade backend services and APIs using Python and FastAPI.
- Company: Join a fast-moving team at a leading tech startup focused on AI investment tools.
- Benefits: Access to ambitious projects, direct support from recruiters, and long-term career growth.
- Other info: Mentor teammates and contribute to best practices as the team scales.
- Why this job: Shape the future of AI-powered investment tools and make a real impact.
- Qualifications: 5-15 years of experience in backend development, strong Python skills, and API deployment expertise.
The predicted salary is between 72000 - 88000 £ per year.
We are looking for a Senior Backend Engineer with 5-15 years of experience to join our engineering team and build the production infrastructure powering our agentic AI capabilities. You'll be a strong individual contributor who loves shipping real features used by real people, in this case, 300+ leading VC and PE firms discovering insights in private markets. We need someone who is killer in Python, has deep experience building and deploying APIs at scale, and is excited about leveraging AI in their work. This is a rare opportunity to join a small, fast-moving team at an inflection point where your backend expertise will directly shape the next generation of AI-powered investment tools.
What will you be doing?
- Building and shipping production-grade backend services and APIs using Python and FastAPI that power our AI features
- Developing the infrastructure and orchestration layer for agentic AI capabilities within the product
- Working closely with databases (Postgres, ClickHouse) to enable intelligent data retrieval and AI-driven analysis
- Mentoring teammates and contributing to engineering best practices as the team scales from ~7 to 30+ people
Tech stack
- Python
- FastAPI
- PostgreSQL
- ClickHouse
- SQL
- LLMs (OpenAI, Anthropic)
- Embeddings / Vector DBs
- AI coding tools (Cursor, Claude)
Why work with Calyptus?
- Access opportunities with ambitious startups and high-growth technology companies
- Direct support from experienced specialist recruiters
- Honest feedback and clear communication throughout the hiring process
- Long-term career support, not just a single job application
We look forward to hearing from you.
Senior Backend Engineer in London employer: Calyptus
Calyptus is an exceptional employer for Senior Backend Engineers, offering a dynamic work environment where innovation thrives. With a focus on ambitious startups and high-growth technology companies, employees benefit from direct support from experienced recruiters, fostering both personal and professional growth. The collaborative culture encourages mentorship and the opportunity to shape cutting-edge AI-powered investment tools, making it a rewarding place to advance your career.
