Backend Software Engineer (Remote, UK)

About Esenda   Esenda powers over £1.5bn of inbound and outbound payments annually, in the education space - from tuition and catering fees to supplier payments and payroll.  We’re a revenue-generating startup with strong product-market fit, and we’re growing fast.  Design, build, and ship reliable backend services and APIs in Python (Flask) that power core product functionality.  Own features end-to-end: data modelling (Postgres), API design, testing, production rollout and ongoing improvements. Help uphold strong engineering standards through thoughtful code reviews, testing discipline, clean architecture, and pragmatic decision-making.  Improve service reliability and operability: monitoring, alerting, logging, runbooks, and reducing on-call toil over time.  CI/CD improvements, incremental shipping, and maintaining a high-quality codebase.  You’ll join an on-call rotation (1 week in 4) compensation: paid as an extra £300 per on-call week.  5+ years experience building and operating production backend systems.  ~ Strong experience with Python, and hands-on use of Flask (or similar frameworks).  ~ Solid understanding of Postgres (schemas, migrations, query performance, transactions).  ~ Comfortable shipping in cloud environments—ideally AWS—and working with modern CI/CD pipelines.  ~ A strong quality mindset: you care about maintainability, security, reliability, and clear documentation. Bonus points for   Payments/fintech knowledge (reconciliation, idempotency, auditability, ledger concepts).  40 days holiday (incl. bank holidays) ~ Pension scheme (3% employer contribution) ~ Fully remote, UK-based, with 3 in-person meetups per year  ~ Python, Flask  Data: Postgres  Cloud: AWS  Pragmatic, high-ownership teams with a bias to shipping  Clear communication, strong collaboration, and continuous improvement  Code reviews and sensible standards that keep quality high without slowing delivery  Technical interview (backend fundamentals, API design, production thinking)  ~ Team chat + Q&A