Senior Software Engineer

Our client, a fast-growing fintech supporting small businesses, is launching a brand-new credit card offering and is seeking an experienced Python Back-End Engineer to lead core payment and processing capabilities.

You'll help build the full credit-card payments engine — taking a lead role in shaping the architecture, driving key technical decisions, and mentoring a small engineering group.

Working within a smaller scale up team, you'll work to a hybrid model of being on-site a few times a month in London.

What You'll Do

• Design and own service architecture for a high-volume payments platform.
• Build a real-time authorisation service handling 100k+ transactions/day with sub-500ms latency.
• Develop a rewards engine supporting cashback, points and other incentives.
• Set engineering standards and support the growth of the team.

What You'll Bring

• Experience with high-availability, low-latency payments or transaction systems.
• Strong OO programming skills (Python ideal).
• Background in data modelling for financial or transactional systems (PostgreSQL a plus).
• Solid knowledge of APIs, microservices and distributed systems.
• Ability to mentor and influence engineering practices.

Nice to Have

• Knowledge of card network flows.
• Experience with financial ledgers or Django.
• Technical or numerical academic background.

The successful Python Back-End Engineer will earn up to £140,000 and in addition there are exceptional benefits which come as part of the overall package including: 15% bonus, pension, training budget, weekly team lunches, travel loans and numerous soft leisurely benefits.

If you are interested in applying for this opportunity and would like to find out more information, please click the apply button and a Spencer Scott Associate will be in touch.

Spencer Scott Ltd is an equal opportunity Recruitment Agency, which means we do not discriminate on the basis of race, colour, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression. We celebrate diversity and are committed to create inclusive working environments for all our clients.