Python Software Developer jobs in United Kingdom

Portfolio Optimization Team

London, UK

We believe the financial markets can and should work for everyone. Capitolis is the technology company helping to create safer and more vibrant financial markets by unlocking capital constraints and enabling greater access to more diversified capital and investment opportunities. Rooted in advanced technology and deep financial expertise, Capitolis powers groundbreaking financial solutions that drive growth for global and regional banks – and institutional investors alike.

Founded in 2017, our team brings decades of experience in launching successful startups, technology, and financial services. Capitolis was recognized on the Inc. 2024 Best in Business list in the Financial Services and Innovation & Technology categories, and honored for the third consecutive year in the 2025 Euromoney Foreign Exchange Awards. The company has been included on CNBC’s World's Top Fintech Companies list for the past three years, Deloitte’s Technology Fast 500 list in consecutive years and was named to Fast Company’s prestigious annual list of The World’s Most Innovative Companies for 2023. American Banker recognized Capitolis among the Best Places to Work in Fintech, and the company was named by Crain’s New York Business as one of New York City’s Best Places to Work in 2025 for fourth consecutive year.

• Design software according to agreed standards, architecture, and requirements
• Plan and build high quality, scalable, and secure solutions
• Work closely with team lead, team members and product managers in defining and implementing roadmap features
• Contribute and drive technological and architectural decisions
• Interface with various R&D groups, as well as support groups
• Create high‑quality responsive UI applications
• Apply web standards for accessibility, responsive design, and support for all browsers
• Sharing knowledge as well as leading correct technological processes
• Proven ability to work autonomously and drive tasks forward

• B.Sc. degree in Computer Science, SW Engineering or equivalent (M.Sc. is an advantage)
• At least 8 years of experience in Java server‑side development, including cloud services (preferably AWS)
• Experience with C# and .NET
• Experience in building complex, large‑scale software solutions from scratch to live production
• Experience with Java, Spring Boot, Spring Data, JPA, Swagger, Maven, Kafka, PostgreSQL, Jenkins, GIT, RESTful Services, Docker
• Strong analytical skills
• Self‑starter, fast learner, and great interpersonal skills
• Excellent English communication skills – spoken and written
• Financial affinity is an advantage
• A “Can‑Do” mentality and mindset
• Can learn and work in a fast‑paced, dynamic environment

The target annual base salary range for this position is £112,000 and is dependent on a variety of factors, including, but not limited to, job‑related experience, qualifications, knowledge, and skills. In addition to base salary, the compensation package for this role includes an annual discretionary bonus and company equity. This role is also eligible to participate in company-sponsored benefits and perks.

• We lead with purpose, while creating exceptional value
• We pursue big breakthroughs, responsibly
• We learn from the best and are unapologetically independent
• We are obsessed with the future and fanatical about executing today
• We play tough, with heart

• Super Smart: quality thinking and know what good looks like
• Badass: all in, get stuff done, and high standards
• Good Human: collaborative, open‑minded, authentic and real, and pursue self‑actualization