Back End Engineer

🔒 Confidential Employer
Posted 28 April 2026
LOCATION
London
TYPE
Full-time
LEVEL
Mid-Senior level
SALARY
£80,000 / year
CATEGORY
Fintech
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion

SKILLS

Python web frameworks Django FastAPI Flask PostgreSQL MySQL MS SQL Oracle

FULL DESCRIPTION

Back End Engineer

Company: [Employer hidden — view at passion-project.co.uk]

Location: London

Salary: £70-80k

Work Type: Hybrid

Job Type: Full-time

Experience Level: Junior, Mid and Senior level

About the Role

The Finance Technology team builds and maintains the payment infrastructure and financial data systems that power [Employer hidden]’s growth. The team partners with the Finance team to build scalable tools and supports other product teams to launch new products with enhancements to the payment infrastructure and financial data systems. As a group of skilled back-end engineers, they work closely with a dedicated Tech Lead and Product Manager, using Agile methods to ship code frequently and solve complex problems together. Four of the team work remotely and three are hybrid, working 1-3 days per week in the London office.

What the job involves

  • Contribute to the delivery of well-defined projects involving many stakeholders and systems
  • Go beyond the code to develop a deep expertise in the Finance Technology team’s domain, understand our core financial products and our stakeholder needs to become a trusted technical advisor to the business
  • Perform detailed technical scoping and prototyping to support feasibility testing and decision making
  • Implement scalable solutions for complex challenges, such as building payment microservices, implementing direct debits, and rearchitecting our reporting technology
  • Translate ambiguous product requirements into clear, actionable technical plans that guide the team’s work
  • Contribute high-quality, production-ready code and foster a collaborative environment by reviewing work, helping to troubleshoot live issues, and writing useful documentation
  • Embrace and demonstrate a growth mindset by sharing new technologies and best practices within the team and across the company
  • Work with the Tech Lead to improve our development and agile practices, and to help raise the technical bar within the team

Who you are

  • Experience with Python web frameworks (Django / FastAPI / Flask / Starlette / Ninja)
  • Experience with relational databases, ideally PostgreSQL, but open to MySQL or similar (e.g., MS SQL, Oracle); emphasis is on data integrity
  • Experience contributing to the delivery of complex projects implemented by several engineers, including taking features from conception (0-1) to launch in a startup, scale-up, or SME environment
  • A strong technical or mathematical foundation, evidenced by a degree in a quantitative field (Computer Science, Engineering, Physics, Maths or similar) or equivalent professional experience
  • Experience of building and managing complex API integrations (e.g., Payments like Stripe/Braintree, or high-scale integrations in industries like Telecoms, Travel, Ad-Tech, or similar)

Desirable

  • A background in high-logic or high-scale fields like Fintech, Gaming, Healthcare Tech, Logistics, Security/Cryptography, or similar

Company Benefits

  • Work where you work best: Twice a year we rent houses in places like Sicily and the French Alps where each team can work together for a week poolside. We champion flexible working in all our teams
  • Invest in [Employer hidden]: We want people to be invested in [Employer hidden]'s success so after six months you'll be awarded share options
  • Keep yourself healthy: We offer comprehensive health insurance and cash plans. You'll also get gym discounts and we host yoga classes in the office every week
  • Start (and end) your day right: Each floor of [Employer hidden] HQ has a fully stocked fridge for breakfast and every Friday we unwind with beers and wine
  • Life-work balance: We know your life outside of work comes first. We offer enhanced maternity and paternity leave for new parents plus a nursery benefit. We also have unlimited unpaid leave
  • Learning and development: Whether you want to learn to code, experiment with motion design, or beat cognitive biases, you'll have time and budget to invest in your professional development
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