Backend Engineer – API Integrationen, Connectoren, Worker/Jobs, Mailer Service, QA

📋 Description

• Build and maintain production-ready API integrations and connectors
• Implement authentication via OAuth, webhooks, retries, and error handling
• Design and develop queue-driven, stateful workers and background jobs
• Build a mailer service with PDFs, logging, retries, delivery checks, deduplication
• Design DB schemas and migrations with PostgreSQL or similar
• Implement audit events, observability, and traceability

🎯 Requirements

• Strong track record in backend engineering with Python, Node.js, Go, or similar
• Experience building production API integrations (OAuth, webhooks, pagination, rate limits, error
• Relational DBs, schema design, migrations (PostgreSQL)
• Testing mindset: contract, integration, unit, and/or E2E tests
• Experience with asynchronous/queue-based systems and background workers
• Knowledge of reliability engineering: idempotency, retries, observability

🎁 Benefits

• 100% remote
• Flexible project-based engagement; workload by project needs
• Full-time/part-time options; freelance contract structure
• Opportunity to work on challenging API integrations and QA automation
• Significant ownership over backend architecture and delivery
• Collaborative, international, digitally focused environment