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Senior Observability Engineer
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Senior Backend Software Engineer
Serbia
Full Remote
AI Summary
Design and implement workflow engines, lead development tasks, and ensure long-term stability. 4-6 years of backend software development experience required. Strong fundamentals in workflow orchestration engines and production services.
Key Highlights
Design and implement workflow engines
Lead development tasks and code reviews
Ensure long-term stability and versioning strategy
Key Responsibilities
Deploy and configure Temporal/Camunda or similar Workflow Engine on Kubernetes
Design and implement SIM Activation workflow
Implement SIM Deactivation workflow with compensation and rollback logic
Implement Plan Change workflow
Design Inventory Management Database schema
Define workflow versioning strategy
Lead another developer on development tasks and code reviews
Order-triggered workflows
Network trigger handling
Retry policies, dead-letter handling, and alerting per workflow type
Temporal production cluster operations and HPA configuration
nd-to-end integration testing, load testing, runbook authoring
Post go-live hypercare and continuous improvement
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Benefits & Perks
Fully remote
Opportunity for professional development
Exciting and challenging greenfield platform
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Nice to Have
Direct Temporal.io production experience
Telecom network element experience
Diameter protocol (Ro/Gy/Gx)
Experience with mock-first development and contract testing
Prometheus + Grafana — instrumenting and monitoring workflow engines
Experience at a telecom operator, MVNO, or telecom vendor
Knowledge of eSIM / GSMA SGP.22 standard
Python — for tooling, scripting, test automation
Job Description
- Deploy and configure Temporal/Camunda or similar Workflow Engine on Kubernetes (self-hosted, production-grade).
- Design and implement SIM Activation workflow: activities for HSS, OCS, PCRF, Inventory update.
- Implement SIM Deactivation workflow with compensation and rollback logic.
- Implement Plan Change workflow (OCS quota update + PCRF policy change).
- Design Inventory Management Database schema: ICCID, IMSI, MSISDN — 30M+ record scale.
- Define workflow versioning strategy (Temporal GetVersion API or similar) — foundational for long-term stability.
- Lead another developer on development tasks and code reviews from week one.
- Order-triggered workflows: Order DB → Temporal/similar signal handler.
- Network trigger handling: location updates → workflow signals via Kong API Gateway.
- Retry policies, dead-letter handling, and alerting per workflow type.
- Temporal production cluster operations and HPA configuration.
- nd-to-end integration testing, load testing, runbook authoring.
- Post go-live hypercare and continuous improvement.
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