Workflow Developer & Tester

Responsibilities

• Implement Temporal workflow activities in Go: HSS adapter, PCRF adapter, Inventory update.
• Build and validate unit tests for all workflow activities from day one.
• Build the Inventory Management Database: tables, indexes, partitioning for 30M records.
• Build bulk import tooling: CSV → ICCID/IMSI/MSISDN range ingestion from vendor.
• Implement REST API endpoints for Inventory DB (allocate, reserve, release, query SIM records).
• Support Sr. Developer on all workflow development tasks — pair programming expected.
• End-to-end test suite: full provisioning flow from SIM activation to order closed.
• Load and stress testing: simulate peak TPS provisioning against all systems.
• Test automation: CI pipeline integration for all workflow and API tests.
• MNP (number portability) hooks in Inventory DB.
• UAT support: reproduce bugs, write regression tests, validate fixes.

Must Have

• 2–4 years backend software development in production environments.
• Go or Java — primary development language for this role is Go.
• Java accepted if strong fundamentals and willing to work in Go (we will support the transition).
• REST API development — building APIs consumed by other services and tested by automated suites.
• Unit and integration testing — writing tests is a first-class responsibility, not an afterthought.
• Git — branching, pull requests, code review participation.
• Experience with event-driven architectures using Rabbit
  
  MQ, Kafka, or Redis Pub/Sub.
• Basic Kubernetes knowledge — understanding how your workloads are deployed.
• Ability to work under technical direction of a senior lead and execute quickly.

Strong Advantage

• Any workflow engine experience:
  Temporal, Camunda, Apache Airflow, AWS Step Functions.
• Telecom or BSS/OSS background — understanding of SIM lifecycle, provisioning, activation.
• Test framework experience:
  Go testing, Testify, mock frameworks.
• Load testing tools: k6, Locust, JMeter — running and interpreting results.
• Docker — building and running containerised services.
• Experience with event-sourced or append-only database patterns.

Nice to Have

• Temporal.io SDK experience — even personal/side project counts.
• Python — useful for scripting, test tooling, data processing.
• Prometheus — understanding how to instrument code with metrics.

• Fully remote
• An exciting and challenging greenfield platform with great skill and knowledge development opportunities.
• The opportunity to join a team of highly professional specialists in an international environment.
• The opportunity for professional development within a reputable international innovative and growing company.