Senior Backend Engineer (Python) – Lisbon, on-site

A fast-growing European fintech startup is building a next-generation accounting platform that helps small and medium-sized businesses spend less time on their finances and more time running their business. We combine AI with solid software engineering to automate financial workflows end to end, and we're looking for a Senior Backend Engineer who wants real ownership, from technical decisions to production.

What you'll do

• Build end-to-end features: backend services, APIs and user-facing experiences.

• Put AI to work in production: LLM-powered workflows combined with deterministic logic, validation and human oversight.

• Design reliable, long-running workflows that handle failures gracefully and never lose track of their state.

• Extract, process and reconcile data from invoices, receipts and bank transactions.

• Help define the architecture, engineering practices and technical direction as the team grows.

What we're looking for

• Solid experience designing, building and maintaining production systems: architecture, databases, APIs and distributed systems.

• Strong Python for backend development. Django and PostgreSQL are a plus.

• Pragmatism: knowing when to keep it simple and when to invest in robustness.

• Ownership: you take problems from idea to production and work closely with technical and non-technical teammates.

• Curiosity for AI engineering (LLMs, agentic workflows). Hands-on experience is a strong plus, not a requirement.

• Professional English.

Why join

• Early-stage product with real impact: your decisions shape the platform.

• Modern stack: Python, Django, PostgreSQL, Google Cloud, React and LLMs, with a say in how it evolves.

• A team that expects you to use AI tools to move faster and focus on quality over lines of code.

• Competitive compensation.

Location

Lisbon, Portugal · On-site, 5 days a week · Full-time.