Senior Backend Developer – (Golang, Data & Integrations)

i3D.net; Capelle aan den IJssel; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

i3D.net is seeking a backend engineer focused on Go to own data migrations, billing data flows, and scalable services. You will build APIs and ETL processes that connect systems like ERP, CRM, and inventory, shaping how customers are billed and how data moves across the organization.

You will work on greenfield architectures, collaborate with Finance, Product, and Business Analysts, and contribute to end-to-end data and billing solutions in a hybrid Rotterdam-based team.

Qualifications

• 5+ years building production backend systems in Go, .NET, or PHP.
• Experience with SQL, MariaDB, or PostgreSQL and complex schemas.
• Experience with ETL, migrations, and data validation tooling.
• Experience building scalable APIs (REST or gRPC) with authentication.
• Hybrid work in Rotterdam preferred; relocation possible.

Responsibilities

• Own data migrations and pipelines: design and implement ETL flows with validation and rollback.
• Model and transform complex data structures across legacy databases.
• Build scalable backend services in Go exposing billing logic via APIs.
• Standardize product, pricing, and billing models across systems.
• Integrate ERP, CRM, payment, and inventory platforms with secure data exchange.

Skills

Go

Backend engineering

SQL

MariaDB

REST APIs

gRPC

Docker

Kubernetes

CI/CD

OAuth/JWT

Tools

PHP

.NET

Terraform

Ansible

Job description

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, and Ubisoft, we are shaping the future of gaming and network technology.

Why your role matters

You’ll own how business and customer data flows across the organization, with a focus on billing, product, and sales data. Working at the intersection of engineering, finance, and product, you’ll build the foundation that makes data reliable and auditable, removing manual reconciliation, stabilizing migrations, and ensuring billing flows and pricing models behave predictably at scale.

This is a backend engineering role, not a traditional data or ETL setup. Using Go, you’ll build services and APIs that expose billing logic and connect systems like HubSpot and NetSuite, shaping how data moves across the organization in production.

You’ll work on greenfield architecture and database design, defining customer data models, system relationships, and asset structures that determine what customers can buy and how it is invoiced, using SQL where needed for validation and reconciliation. You’ll be part of a team of five developers, working closely with a Business Analyst and owning these flows end to end.

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, GitHub Actions

• 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: Experience with SQL, MariaDB, or Postgres and working with complex schemas

• Migrations and ETL: You’ve 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

• 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).

Why join us?

• High ownership and real technical depth: You’ll design systems, not just implement them, and take full ownership from idea to production.

• Make an Impact: Work on core projects that power global gaming and tech giants like Ubisoft.

• Hybrid Work Setup: Enjoy the flexibility of a hybrid role with a work-from-home budget and top‑tier tools.

• Competitive Perks: Enjoy great pay, shift bonuses, an annual bonus, 25 vacation days (excluding national holidays), travel allowance, and a premium‑free pension.

• Skill Development: Level up with career guidance and education reimbursement.

• Gaming Perks: Get lifetime access to Ubisoft’s game library

• Stay Active: Use our in‑house gym in Rotterdam or unwind in the game and music rooms.