Workflow Developer & Tester

Webbing; Amsterdam; On-site; EUR 55,000 - 75,000; Full time

Benefits offered by this job

Fully remote

Skill development opportunities

Professional development in an international environment

Joining a team of specialists

Job summary

Webbing is seeking a Backend Developer to join their team in Amsterdam. The role focuses on implementing workflow activities using Go, building a robust Inventory Management Database, and developing REST API endpoints. Candidates should have 2–4 years of experience in backend software development, proficiency in Go or Java, and be familiar with PostgreSQL and REST API testing. The position offers fully remote work options while providing opportunities for skill development within an innovative international company.

Qualifications

• 2–4 years backend software development experience.
• Proficient in Go or Java, willing to work in Go.
• Experience in REST API development with automated testing.
• Knowledge of PostgreSQL for database design and queries.
• Demonstrated ability in writing unit and integration tests.
• Experience with Git for version control.
• Familiarity with event-driven architectures.
• Basic knowledge of Kubernetes.
• Ability to work under the guidance of senior developers.
• Fluent in English.

Responsibilities

• Implement Temporal workflow activities in Go.
• Build and validate unit tests for workflow activities.
• Develop Inventory Management Database and tools.
• Implement REST API endpoints for Inventory DB.
• Conduct load and stress testing.
• Support automated testing integration.

Skills

Backend software development

Go programming

REST API development

PostgreSQL

Unit and integration testing

Git

Event-driven architectures

Kubernetes

Fluent English

Tools

Docker

Load testing tools

Temporal

RabbitMQ

Kafka

Job description

Responsibilities

• 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.

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.