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# Senior/Staff Backend Engineer (London, Hybrid)

- **Company:** DualEntry
- **Location:** London, UK
- **Experience:** Expert
- **Salary:** £40,000.0 - £70,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Amazon Web Services, Business Logic, Databases, Continuous Integration, Django Web Framework, Python (Programming Language), PostgreSQL, SQL Databases, Systems Integration, Web Application Frameworks, Flask (Web Framework), Backend, Fastapi, Search Engines, Webhooks
- **Published:** October 27, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=ed7151fa40ddbdbc

## About the Role

* Hardcore work ethic and high agency
 * 5+ years in backend engineering (language agnostic)
 * Deep experience with complex business logic products
 * Strong database skills: PostgreSQL, SQL, ORMs, migrations, schema design
 * Experience deploying on AWS (or similar), with solid CI/CD and production-readiness fundamentals
 * Bonus: Python and a modern web framework (FastAPI, Flask, or Django)

## Description

* Design backend systems and APIs (Python preferred) that run real-time, business-critical accounting logic
 * Ship features end to end - architecture, CI/CD, testing, monitoring, and beyond
 * Integrate third-party tools and external systems, proactively managing edge cases and risk, * Ignacio shaped the baseline of our integration framework from scratch in a single weekend, then spent most weekends - while coordinating the team - shipping what was never on the roadmap: webhooks, a search engine for millions of transactions, and Puma itself. Pure initiative, compounding.
 * Marcin took a non-existent tax structure and built it end to end, setting the north star for how the team keeps improving it on top of it; modular and robust, always setting the bar for the rest.
 * Puhiza grew her team from one to full capacity, while owning our integration framework end to end; scaling it to support migrations, integrations, and bank connections. The queen of I/O on our platform.
 * Danylo took ownership of our bank connection engine end to end and rebuilt it from scratch., * Hard working: 'You can work long, hard, or smart, but [here] you can't choose two out of three' - Jeff Bezos.
 * Curious: you love to learn, are highly curious about new frameworks and solutions to engineering problems
 * Fast-moving: you deploy daily, iterate quickly, and never wait for permission