Backend Engineer - FinTech (m/f/d)

As a key growth accelerator, A11 partners with Europe’s most ambitious startups and scaleups, corporates and SMBs to connect them with top-tier talent. We're looking for an experienced Backend Engineer to work on the backend infrastructure that handles payments, financial data, and compliance-critical workflows.

• Design and implement backend services for payment processing, invoicing, reconciliation, and smart financial reporting
• Build robust, auditable data pipelines that ensure accuracy and traceability across all financial operations
• Develop and maintain integrations with payment gateways, banking APIs, and financial data providers
• Enforce data integrity standards and implement patterns for idempotency, retry logic, and failure handling in financial flows
• Collaborate with compliance and product teams to translate regulatory requirements into technical implementation
• Contribute to fraud detection logic, rate limiting, and access control mechanisms that protect financial operations
• Own incidents end-to-end — investigate, resolve, and drive post-mortems to improve system reliability

• 5-7+ years of backend engineering experience, with meaningful exposure to FinTech, payments, or financial data systems
• Strong proficiency in Java (Spring Boot) with a deep understanding of transactional systems and data consistency
• Solid experience with PostgreSQL, including schema design, indexing, and query optimization for financial data
• Experience integrating with payment processors (Stripe, Adyen, or similar) or open banking APIs
• High ownership mindset — you care about correctness as much as you care about delivery speed
• Calm under pressure, structured in your thinking, and rigorous in your testing practices

• Real ownership from day one – shape operational processes in a fast-scaling, AI-first company
• Learn from the best – work directly with senior operators
• Competitive compensation – attractive base salary and performance-based bonus program
• Personal growth & visibility – rapid learning opportunities, cross-functional exposure, and early leadership potential in a growing global team
• Vibrant company culture – modern Berlin office, monthly All-Hands, team events, and regular offsites