We’re looking for a senior backend engineer to continue building and shipping production SaaS features at the intersection of AI, accounting, and compliance-heavy systems. You’ll own features end-to-end across backend and AI-driven document workflows.

Responsibilities

The backend developer needs to be comfortable with:

• Building and debugging PDF parsers that can handle messy real-world bank statements from UK high-street banks
• Working with AI/LLM APIs (Claude, GPT-4V) in production, including prompt engineering, cost management, confidence scoring, and PII safety
• Implementing UK tax legislation as code, including VAT schemes, income tax bands, loss reliefs, and HMRC MTD API integration
• Writing reliable async job processing with proper error handling, retries, dead-letter queues, and observability
• Working with PostgreSQL at scale, including complex queries, materialised views, and pgvector for similarity search
• Building a multi-tenant SaaS platform with strict role-based access, period locking, audit trails, and GDPR compliance
• Integrating with third-party APIs such as Open Banking aggregators, HMRC, OCR providers, broker platforms, and Companies House
• Writing and maintaining comprehensive test suites (unit, integration, and end-to-end)
• Debugging production issues under pressure, including stability issues, crash diagnosis, and error-trace analysis

Required Skills

• Strong Node.js/TypeScript experience
• Worked with financial or accounting software before (MANDATORY)
• Understand UK tax and VAT rules (or be able to learn them quickly from specifications)
• Comfortable with AI/ML integration in a production environment.

Tech stack:

• Node.js / TypeScript
• PostgreSQL
• Redis
• BullMQ
• Open AI
• Claude API (LangChain.js)- To be introduce
• AWS
• Sentry – – To be introduce
• Vitest / Playwright -To be introduce