Senior Backend Developer (.NET/Golang) - Global Customer Platform
i3D.net
Your tasks
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
As a Senior Backend Developer in our Customer Success team, you’ll help design and build the platform that supports our next generation of customer-facing services. The focus is on modernizing a complex backend, replacing legacy systems with a clean, scalable foundation built in .NET and Golang. You’ll be the one connecting the dots—both technically and across the team—making sure everyone understands how the system works and where it’s headed.
???? The Vision
We’re creating a backend platform that powers customer onboarding, self-service, automation, and the configuration of services like dedicated servers, colocation, and networking. At the heart of it is a role- and permission-based service layer that bridges legacy infrastructure with a modern interface.
The goal? A unified API surface that simplifies the customer experience and enables internal teams to gradually phase out legacy code—without disruption. This isn’t just about building endpoints; it’s about laying the groundwork for a platform that scales globally, supports automation, and drives the next chapter of our evolution.
Key Responsibilities
- Build backend-for-frontend (BFF) services that enable customer self-service features.
- Design and implement role- and permission-based access control (Auth0-based).
- Migrate business logic from legacy PHP APIs into clean, scalable services in .NET and Go.
- Develop APIs that unify legacy and modern systems, improving usability and maintainability.
- Enable automation for infrastructure services like server leasing, colocation, and networking.
- Collaborate closely with team members to explain and document a complex codebase.
- Take ownership of your work—including deployment—while contributing to architectural decisions.
- Help reduce key-person dependency by sharing knowledge and improving system transparency.
Tech stack
At i3D.net, you’ll work with:- Languages: Golang, .NET, PHP (legacy).
- 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 new, maintainable services that replace key legacy components.
- You’ve helped the team navigate and understand the backend landscape.
- Our customer platform runs smoother, faster, and is easier to extend.
- You’ve contributed to knowledge sharing that reduced risk and increased team autonomy.
- You’re prepared to transition into broader backend roles in teams like Metal or API.
Your profile
- Experience: You’ve been building backend systems for 5+ years, mainly with .NET and Golang, and you’re comfortable diving into existing PHP code when needed.
- Tech Explorer: You enjoy working across different technologies and figuring out how complex systems fit together, and you’re not afraid to help shape the bigger picture.
- System Thinker: You know how to design APIs that connect old and new, and you’re good at untangling problems without needing a detailed roadmap.
- Tools & Habits: You’ve worked with things like Docker, GitLab pipelines, and Kubernetes, and you’re used to CI/CD, TDD, and working in an Agile way.
- Pragmatic Coder: You keep things clean, fix what needs fixing, and don’t overcomplicate stuff.
- Good Communicator: You can explain how things work to others—clearly and with patience—and you like helping teammates grow.
- Location: This is a hybrid role based in Rotterdam. We're in the office two days a week, so we're looking for someone who is already living in the Netherlands.
Why join us?
- We have been around: Join a company with 20+ years of sustainable growth and a global focus.
- Global (gaming) customers: Work on core projects that make an impact for big names like Ubisoft and Discord.
- Hybrid Work Setup: Enjoy the flexibility of a hybrid role with a work-from-home budget and top-tier tools.
- Career Growth: Access education reimbursement, career guidance, and opportunities to upskill.
- Competitive Perks: Annual bonus, 25 vacation days (excluding national holidays), travel allowance, and a solid pension plan.
- Stay Active: Free access to our in-house gym in Rotterdam.
- Global Reach: Be part of a company with over 20 years of growth, serving a worldwide market.
- Free Games: Enjoy lifetime access to Ubisoft’s game library
