Full-Stack Engineer (Backend Leaning) - Payments Engineering

This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Full-Stack Engineer (Backend Leaning) – Payments Engineering based in Germany.

As a Full-Stack Engineer specializing in backend development, you will help build and evolve the payment infrastructure that powers a rapidly growing AI technology platform. You will work on critical systems responsible for billing, usage tracking, pricing, and payment processing across self-service and enterprise customers. Your work will directly impact revenue accuracy, customer experience, and the reliability of financial operations. You will contribute to modernizing existing systems, developing scalable event-processing services, and integrating new payment solutions while ensuring seamless migrations. Working closely with Engineering, Product, Growth, Finance, Tax, and Sales teams, you will solve complex technical challenges in a fast-paced, AI-first environment.

This remote opportunity offers significant technical ownership, opportunities to tackle challenging engineering problems, and the freedom to make a measurable impact on products used by millions of people and businesses worldwide.

Accountabilities
- Design, develop, and maintain reliable payment and billing systems that support customer transactions, pricing models, and revenue operations across self-service and enterprise offerings.

- Build and improve usage-tracking and metering systems to ensure accurate measurement of customer activity while minimizing performance overhead and latency.

- Lead and contribute to the migration and modernization of enterprise pricing and usage-processing infrastructure, including the development of stream-processing services for usage events.

- Improve payment experiences by simplifying customer upgrades and transactions, supporting payments through different legal entities, and integrating additional payment providers.

- Collaborate with Finance and Tax teams to meet compliance, auditing, reporting, and financial accuracy requirements.

- Partner with Product and Growth teams to implement pricing changes, support experimentation, and enable new commercial strategies.

- Investigate and resolve complex billing issues by analyzing customer journeys, application logs, system behavior, and code to identify root causes and implement lasting solutions.

- Design and implement secure, scalable APIs, backend services, data storage solutions, and supporting infrastructure.

- Plan and execute migrations and system changes carefully, ensuring backward compatibility, minimizing disruption, and protecting customers from billing errors or payment interruptions.

- Work cross-functionally with engineers, Sales teams, Forward Deployed Engineers (FDEs), Finance specialists, and other stakeholders to deliver robust payment solutions.

- Maintain high standards for testing, security, code quality, observability, and operational reliability across systems that process financial transactions.

- Take ownership of technical challenges from investigation and design through implementation, deployment, monitoring, and continuous improvement.

Requirements:

- Strong Python expertise: Demonstrated proficiency in Python and the ability to build maintainable, reliable, and efficient software.

- Backend engineering experience: A strong background in backend development, including designing and operating production systems.

- Software and system design: Solid understanding of common software architecture and design patterns, APIs, cloud infrastructure, storage technologies, and data structures.

- Testing and security: Strong fundamentals in test design, automated testing, application security, and building dependable production systems.

- Production debugging: Ability to investigate complex technical issues, analyze logs and application behavior, identify root causes, and implement effective solutions.

- System adaptability: Ability to quickly understand a large existing codebase and navigate complex infrastructure, legacy components, and interconnected services.

- Financial accuracy and attention to detail: A careful, methodical approach to modifying live systems that handle payments, pricing, usage data, and revenue.

- Migration and reliability mindset: Ability to plan and execute system changes safely, manage technical risks, and minimize disruption to customers and business operations.

- Ownership and problem-solving: A proactive, independent approach to solving challenging engineering problems, making sound technical decisions, and delivering measurable results.

- Cross-functional collaboration: Strong communication skills and the ability to work effectively with engineering, product, growth, finance, tax, and commercial teams.

- Flexible qualifications: No formal degree, certification, or specific length of professional experience is required. Demonstrated ability to solve difficult technical problems through previous projects, open-source contributions, or GitHub work is valued.

The following qualifications are considered an advantage:

- Experience integrating payment-processing providers or developing billing, subscription, and usage-based pricing systems.

- Familiarity with stream processing, event-driven architectures, or high-throughput event pipelines.

- Experience working with financial operations, tax requirements, compliance processes, or audit-related systems.

- Experience deploying and operating applications in Kubernetes environments.

Benefits:

- Remote-first flexibility: Work remotely from Germany or other eligible locations across Europe, the United Kingdom, Ireland, and the United States, subject to hiring eligibility.

- International office access: The option to work from offices in Dublin, London, New York, San Francisco, or Warsaw.

- Professional development budget: Access to an annual discretionary stipend to support learning, training, and professional growth.

- Coworking allowance: Receive a monthly coworking stipend if you are not located near one of the main office hubs.

- Team connection and travel: An annual discretionary stipend to meet and spend time with colleagues in person.

- Annual company offsite: Participate in a company-wide gathering at a different destination each year.

- Innovative engineering culture: Work in an AI-first environment that emphasizes rapid experimentation, technical excellence, autonomy, and minimal bureaucracy.

- Career growth opportunities: Take on challenging projects and expand your impact beyond the immediate scope of your role.

- Meaningful technical ownership: Help shape critical payment infrastructure and solve complex problems with direct effects on customers and business performance.

- Collaborative international team: Work alongside talented engineers, researchers, and operators across multiple countries and disciplines.