• Own backend features end-to-end: scope → design → implement → test → ship → observe • Build production-grade web services and APIs (primarily in PHP with Symfony) • Write efficient SQL (MySQL) and use Doctrine ORM effectively; tune queries and indexes • Improve reliability and performance through thoughtful design, profiling, and instrumentation • Partner with Product and Design to turn requirements into simple, lovable solutions • Raise the bar on engineering standards, tooling, observability, and developer experience • Mentor peers (and be open to being mentored); give and receive clear, actionable feedback

• Lead the technical direction of projects, making high-level architectural decisions for full-stack applications that integrate AI services • Design and build robust backend services (Python) and intuitive, interactive frontend interfaces (React/Vue/Angular) that visualize complex data and AI interactions • Architect and maintain data processing pipelines, agentic workflows, and LLM integrations to solve real-world client problems • Foster a culture of excellence by performing rigorous code reviews, mentoring junior and senior developers, and driving the adoption of best practices • Partner closely with Product Management, Design, and QA to translate complex requirements into technical roadmaps and deliverable software • Evaluate system performance across the full stack, identifying bottlenecks in both the frontend rendering and backend AI inference layers to ensure scalability and reliability • Stay ahead of the curve on the latest AI trends (e.g., SLMs, Agentic AI, Multimodal models) and web technologies, advising stakeholders on feasibility and implementation

• Wspólnie z londyńskim partnerem, rozwijamy platformę opartą o AI, która mierzy emisje CO₂ od samego źródła • Angażują się w projekt i dbają o jakość swojej pracy

• You will be responsible for owning and delivering quarterly goals for your team, leading engineers through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery. • You will design and implement backend services and APIs using Python or Kotlin, operating within Affirm’s microservice and event-driven architecture. • You will take an active role in shaping the team’s roadmap, collaborating on technical design, and driving execution across projects that span multiple teams. • You will partner with the Engineering Manager and your teammates to elevate quality standards, evolve engineering processes, and represent the team in cross-functional initiatives. • You will collaborate cross-functionally with stakeholders in Fraud Ops, Compliance, Product, Machine Learning, and Analytics to build scalable fraud tooling and infrastructure. • You will proactively identify opportunities to improve system reliability, team efficiency, or architecture—and lead efforts to address them. • You will contribute to operational excellence by maintaining high observability standards, responding to incidents, and participating in the on-call rotation. • You will foster a culture of ownership, inclusion, and craftsmanship by mentoring teammates, providing feedback, and upholding high code and design standards. • On-Call Rotation - There would be an on-call rotation for this role as a requirement.