The Dev / senior developer is the primary builder for both Lambda services, the shared Ometria client library, Kafka producer logic, and backfill tooling. This role requires strong backend engineering skills with hands-on AWS serverless experience. Required skills: .Net: 4+ years production experience in the primary Lambda runtime; ability to write clean, testable, well-structured code with proper error handling and logging. AWS Lambda & serverless: Practical experience building and deploying Lambda functions, including timeout management, concurrency configuration, cold-start optimisation, and Step Functions for orchestration if needed. REST API integration: Experience consuming third-party REST APIs with pagination, rate-limit handling, retry/backoff strategies, and authentication (API key headers). Familiarity with Ometria or similar marketing platform APIs is a plus. Apache Kafka: Hands-on experience producing messages to Kafka topics, including AVRO serialisation, Schema Registry ...