• Design, build, and maintain advanced backend features that support scale, reliability, and excellent user experiences. • Architect and evolve APIs and services with an emphasis on performance, clarity, and long-term maintainability. • Contribute to the design and implementation of AI-powered features using techniques such as LLMs, RAG, embeddings, vector databases, and agent-based workflows. • Use modern AI coding tools to accelerate development while maintaining high standards for correctness, security, and maintainability. • Identify and resolve performance bottlenecks across application code, databases, and infrastructure. • Help ensure our systems meet high standards for data integrity, privacy, and security. • Work closely with frontend engineers, product managers, and designers to deliver cohesive solutions. • Mentor other engineers, participate in technical decision-making, and contribute to a culture of learning and continuous improvement.

• Implement microservices and event-driven workflows to integrate Koalafi's systems with a third-party loan servicing platform • Build and maintain REST APIs that support loan origination, payment processing, and customer servicing operations • Navigate and contribute to existing internal services where the NPIL product intersects with current Koalafi systems — reading unfamiliar code, understanding its intent, and making clean, well-scoped changes • Develop frontend components in React/TypeScript to support customer-facing and internal tooling as needed • Write code that is testable, observable, and built to last — not just built to ship • Work closely with the Tech Lead on system design and integration architecture • Partner with Product and Compliance to understand requirements and translate them into reliable, compliant implementations • Participate in code reviews — both giving and receiving feedback with the goal of raising the bar, not just checking a box • Engage actively in sprint ceremonies: planning, retros, standups — contribute to the team's rhythm, not just your own ticket • Implement monitoring and alerting at integration points so issues surface before customers notice them • Support audit logging and data reconciliation requirements inherent to a regulated financial product • Identify and flag technical risk early — bad news early is always better than bad news late • Leverage AI development tools to move faster and stay consistent with team patterns

• Abstract and consolidate core functions into reusable libraries and frameworks • Extract existing functionality from application code and refactor for shared use • Design and implement an I/O framework supporting multiple protocols and data interfaces • Define and maintain data dictionaries and I/O level specifications • Collaborate with system architects to ensure ARINC-653 partitioning integrity • Support certification activities through HLR/LLR documentation and DAL compliance • Contribute to long-term strategy for scalable, maintainable software infrastructure

• Partnering closely with your Product Manager to define, scope, and prioritise features - bringing your own product thinking to the table, not just taking a ticket and running with it • Owning features end to end, from architecture decisions through to production, across the full stack (front end, back end, and everything in between) • Leveraging AI tooling throughout your workflow to move fast, bridge skill gaps, and operate effectively within a lean crew • Writing and maintaining clean, well-considered TypeScript across both frontend (React) and backend (NestJS), with GraphQL APIs connecting the two • Collaborating with subject matter experts - including a Staff Engineers, Engineering Managers, Designers, Data Science, QA, and DevOps - on an ad hoc basis as your work demands • Contributing to a delivery culture that values speed, ownership, and continuous improvement over bureaucracy and hand-offs