Senior Backend Developer – (Golang, Data & Integrations)

At i3D.net, we provide world-class global coverage with one of the most interconnected networks in the world. Our solutions focus on low latency, zero packet loss, and unmatched scalability, enabling seamless experiences for millions of users worldwide. With dedicated support, bespoke solutions, and cutting-edge technology, we deliver reliable, cost-efficient infrastructure that empowers game developers and businesses to scale effortlessly. Partnering with major names like Nvidia, DuckDuckGo, Discord, and Ubisoft, we are shaping the future of gaming and network technology.

Why your role matters

You’ll take ownership of how business and customer data flows across the organization, with a strong focus on billing, product, and sales data. This role sits at the intersection of engineering, finance, and product, where accuracy and consistency directly impact revenue and decision making.

You’ll design and build the foundations that make data reliable and auditable, removing manual reconciliation work and stabilizing migrations. Your work will shape how systems interact, ensuring billing flows, pricing models, and integrations behave predictably at scale.

This is not a traditional data or ETL role. You’ll use Go to build backend services and APIs that expose billing logic, power integrations between systems, and handle data flows reliably in production. For migrations, transformations, and validation, you’ll work with tools like SQL and Python, building idempotent scripts, validation checks, and automated reconciliation processes.

What you’ll be doing

• Own data migrations and pipelines: Design and implement ETL flows to move billing, contract, and asset data into target systems with full validation and rollback capability

• Model and transform complex data structures: Analyze legacy databases, define transformation logic, and ensure consistent, idempotent data handling

• Build scalable backend services in Go: Develop services and abstraction layers that expose billing logic and enforce business rules, while leveraging the right tools (e.g. SQL, Python) for data transformations and migrations

• Standardize product and pricing models: Define reusable product and offer structures that work consistently across systems and integrations

• Integrate external systems into billing flows: Connect ERP, CRM, payment, and inventory platforms with secure, reliable data exchange and reconciliation

• Develop robust APIs and integrations: Build REST and gRPC APIs with strong validation, logging, retry logic, and monitoring

• Automate migrations and operational processes: Create tooling, scripts, and runbooks that support repeatable migrations and controlled cutovers

• Improve observability and incident response: Implement monitoring, dashboards, and alerting to quickly detect and resolve data or integration issues

• Collaborate across teams: Work closely with Finance, Product, and Business Analysts to refine business rules and validate outputs

• Mentor and contribute to architecture decisions: Share knowledge, review code, and help shape the long-term billing architecture

Tech stack

At i3D.net, you’ll work with:

• Languages: Golang (primary), PHP (legacy), .NET

• Infrastructure & Tools: Docker, Kubernetes, Ansible, GitLab pipelines, OpenSearch

• Databases: MariaDB

• Practices: Test-Driven Development (TDD), CI/CD pipelines, Agile methodologies - we follow a "you build it, you deploy it, you support it" philosophy

• IDE: Choose the development environment that you're most comfortable with

What success looks like in the first year

• You’ve delivered reliable migration plans and scripts with rollback strategies, automated validation, and clear verification reporting

• You’ve defined and documented data mappings and transformation rules, including legacy schemas, business logic, and edge cases

• Standardized product, pricing, and billing models are implemented and consistently used across systems and integrations

• Core billing APIs, services, and integrations are live, including payment flows and inventory sync, with validation, logging, and auditability

• Monitoring, dashboards, and runbooks are in place, giving clear insight into data quality, system health, migrations, and incident handling

Your profile

• Backend engineering: 5+ years of building production systems in Go, .NET, or PHP and comfortable using Go as the main language

• Data and SQL: Strong experience with MySQL, MariaDB, or Postgres and working with complex schemas

• Migrations and ETL: Designed transformation pipelines, written idempotent scripts, and built validation tooling

• APIs and integrations: Built and integrated REST or gRPC APIs with authentication patterns like OAuth2 or JWT

• 3rd party integrations: Connected systems such as ERP, CRM, payment providers, or inventory platforms

• Infrastructure and automation: Comfortable with Docker, CI/CD pipelines, and tools like Terraform or Ansible

• Observability and reliability: Experience with Prometheus, Grafana, logging, and tracing

• Testing and quality: Write unit, integration, and contract tests to ensure reliability

• Ownership and communication: Take end to end responsibility and work effectively with technical and nontechnical stakeholders

• Remote vs Onsite: This is a hybrid position with some onsite work required at our Rotterdam office. You are either already in the Netherlands or open to relocating here, and we provide relocation services to support your move (a valid EU work permit is necessary).