Backend engineer

Description

Build and scale the NDC aggregation engine in Go — a high\-throughput API that normalises multi\-airline NDC responses into a single canonical schema. You'll own service reliability, design REST APIs, and work at the intersection of distributed systems and airline distribution. **What you'll do** * Design and maintain high\-throughput Go services (chi/v5\) that fan out across a bunch of airline NDC APIs concurrently via errgroup, circuit breakers, and per\-connector timeouts. * Own service reliability — on\-call rotations, incident response, structured logging (zerolog), and post\-mortems. * Evolve the internal adapter framework (ndcmaster \+ per\-airline packages) to onboard new airline connections efficiently. * Work with PostgreSQL (pgx/v5\) for durable order/offer state and Redis (go\-redis/v9\) for cache\-aside offer caching, rate limiting, and API\-key lookups. * Define and enforce engineering standards around testing, observability (Prometheus / OpenTelemetry), and deployment (Docker multi\-stage, Kubernetes, Render.com). **What we're looking for** * 3\+ years of backend engineering experience, with production Go. * Experience building REST APIs and working with relational databases (PostgreSQL). * Comfortable with Redis for caching and rate\-limiting patterns. * Familiarity with containerised deployments (Docker) and infrastructure\-as\-code (Render Blueprint / Kubernetes). * Strong opinion on code quality, testing (table\-driven), and documentation. **Nice to have** * Experience with message queues (RabbitMQ) for async work distribution. * Prior exposure to airline or travel industry APIs (NDC, GDS, IATA standards). * Familiarity with OAuth2 client\_credentials flows and XML/JSON transformations. Sueldo: 40\.000,00€\-60\.000,00€ al año Ubicación del trabajo: Teletrabajo híbrido en Barcelona, Barcelona provincia (Barcelona)