The Role
Build and maintain .NET-based AWS serverless Lambdas, shared client library, Kafka producers, and backfill tooling. Implement REST API integrations, AVRO schemas with Schema Registry, DynamoDB schemas for state persistence, data ingestion patterns, and robust unit/integration testing.
Summary Generated by Built In
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 integration, producer configuration (acks, retries, idempotency), and troubleshooting publish failures.
- AVRO & Schema Registry: Ability to define, version, and register AVRO schemas; understanding of schema evolution (backward/forward compatibility) and contract-first design.
- Amazon DynamoDB: Experience designing table schemas (partition/sort keys), managing read/write capacity, implementing TTL policies, and using DynamoDB for cursor/state persistence and configuration storage.
- Data pipeline design: Understanding of batch/incremental ingestion patterns, idempotency strategies (composite keys, deduplication), cursor-based change tracking, and data correctness in distributed systems.
- Testing: Strong unit testing discipline; experience with integration testing using mocks, stubs, or sandbox environments for external APIs and Kafka.
Desirable:
- Experience with Snowflake or data warehouse ingestion patterns.
- Familiarity with Ometria’s API v2 (contacts, lists, list changes endpoints).
- Experience with historical backfill tooling (phased execution, rate-limit-aware replay).
- Knowledge of PII handling and data minimisation in event-driven architectures.
Skills Required
- .Net: 4+ years production experience in Lambda runtime; write clean, testable code with proper error handling and logging
- AWS Lambda & serverless: build and deploy Lambdas, timeout management, concurrency config, cold-start optimisation, Step Functions
- REST API integration: consuming third-party REST APIs with pagination, rate-limit handling, retry/backoff, and API key authentication
- Apache Kafka: producing messages, AVRO serialization, Schema Registry integration, producer config (acks, retries, idempotency), troubleshooting publish failures
- AVRO & Schema Registry: define, version, register AVRO schemas; understand schema evolution and contract-first design
- Amazon DynamoDB: design table schemas (partition/sort keys), manage capacity, implement TTL, use for cursor/state persistence and config storage
- Data pipeline design: batch/incremental ingestion, idempotency strategies, cursor-based change tracking, data correctness in distributed systems
- Testing: strong unit testing discipline; integration testing using mocks, stubs, or sandbox environments for external APIs and Kafka
- Experience with Snowflake or data warehouse ingestion patterns
- Familiarity with Ometria API v2 (contacts, lists, list changes endpoints)
- Experience with historical backfill tooling (phased execution, rate-limit-aware replay)
- Knowledge of PII handling and data minimisation in event-driven architectures
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The Company
What We Do
Genzeon advances highly effective, secure, and innovative technology solutions for healthcare and retail clients, including intelligent automation, security, compliance, and cloud services. Founded in 2009, by a group of leaders with a shared commitment to unleashing human potential, Genzeon is blazing new trails in fueling innovation, transforming businesses and unleashing efficiency. Our vision is to Dream Big, Deliver Excellence
