Workflow Developer & Tester

- 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). - Write integration tests: workflow → mock NE → database assertions. - 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. - HSS sync integration: IMSI allocation state reflected in HSS (mock → real NE). - MNP (number portability) hooks in Inventory DB. - UAT support: reproduce bugs, write regression tests, validate fixes. Requirements: 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. - PostgreSQL — table design, indexes, writing queries, understanding query plans . - 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 RabbitMQ, 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. - Fluent English. 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. - Telecom protocol familiarity: Diameter, SS7, SMPP. About Webbing: Founded in early 2010, Webbing is a global data MVNO that delivers enterprise grade, global connectivity and IoT services across more than 200 countries and 600+ mobile carriers' networks. Webbing's secured network delivers network protection and web content intelligence. Enterprise customers can manage, monitor, and optimize data usage in real-time with Webbing's powerful software platform. Gain visibility by application type and have the power to white list applications and limit non-business applications with the click of a button, saving money and improving compliance. What we offer: - 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.