Senior Backend Developer – (Golang, Data & Integrations)

WebHosting; Rotterdam; Hybrid; EUR 80,000 - 120,000; Full time

Benefits offered by this job

Great pay and bonuses

25 vacation days

Travel allowance

Pension (premium-free)

Job summary

i3D.net is seeking a Senior Backend Developer to design and implement Go-based services for billing, data flows, and integrations with ERP/CRM systems. You will own data migrations, modeling, and API design in a hybrid work setup at our Rotterdam HQ.

You’ll collaborate with Finance, Product, and Business Analysts to ensure reliable, auditable data in production. You will work on greenfield architecture, data models, and scalable services, using SQL where needed and ensuring robust validation,

Qualifications

• 5+ years building production systems in Go, .NET, or PHP.
• Experience with SQL databases like MariaDB or Postgres.
• Familiarity with ETL, migrations and data pipelines.
• Experience with REST or gRPC APIs and integrations.
• Hybrid/Onsite in Rotterdam with relocation support.

Responsibilities

• Own data migrations and pipelines with full validation and rollback.
• Model and transform complex data structures across systems.
• Build scalable backend Go services exposing billing logic.
• Standardize product and pricing models across integrations.
• Integrate ERP, CRM, payment, and inventory platforms.
• Develop robust REST and gRPC APIs with validation and logging.
• Improve observability with monitoring and alerting.

Skills

Go

Backend engineering

REST APIs

Data migrations

SQL queries

Data modeling

Tools

Docker

Terraform

Ansible

CI/CD

MariaDB

PostgreSQL

Job description

Senior Backend Developer - (Golang, Data & Integrations)

i3D.net ·Netherlands, Rotterdam HQ

Job Description

At i3D.net , we provide world-class global coverage with one of themost interconnected networksin 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 likeNvidia, DuckDuckGo, andUbisoft, 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

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

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 non-technical 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).

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.