Workflow Developer & Tester

Company: Webbing

* 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.

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