Workflow Developer & Tester

Role Summary

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

• 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.

Benefits

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.