About the role
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.