Workflow Developer & Tester

Description

• 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.

Source: Jobicy (https://jobicy.com/jobs/143728-workflow-developer-tester)