Senior Backend Developer (.NET/Golang) – Global Customer Platform

Rotterdam

Product

Full-time

Experienced

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

Work From Home Budget

Remote is the new office. Optimize your home office space to suit your comfort and needs.

High-End Laptop

You will have the latest Dell Precision or a MacBook Pro at your disposal, ensuring you're fully equipped to rock 'n roll from day one.

Annual Bonus

Get your hard work rewarded with our performance-based bonus of up to 12% of your yearly salary.

Travel the Globe

With offices, data center PoPs, and customers scattered across the globe, you'll be sure to see a city or two.

Vitality @ Work

Keep your mind and body in top shape with our company-funded programs. Quit smoking, get a health check, personal training, or mental coaching.

Workout in our Gym

A fully equipped gym in our Rotterdam office equals deadlifts, squats, and the treadmill for breakfast, lunch, or dinner.

Personal Development

The sky is the limit. We offer you all the room to grow. With our unlimited educational fund, we've got you covered for everything from books or part-time courses to a whole Master’s degree.

Get Free Games

Access to the entire Ubisoft backlog for life comes with the job! You'll never be bored again.

Fantastic Bar

Views, 50 specialty beers, french fries, Friday afternoon drinks, and an all-you-can-eat candy buffet.

What we do

Low latency is our mission! In 2002 we set out to improve online experiences for gamers. Today, we translate our hosting innovations to various industries, but gaming is still in our DNA. And as of 2019, we are part of the Ubisoft family! We build out our network presence in data centers across the globe – from Madrid to Mumbai, Amsterdam to Seattle, and everything in between – bringing content closer to the users.

Our team works hard on everything related to running our privately owned premium network, from opening new points-of-presence, setting up peering relationships, developing integral products like anti-DDoS protection, and serving our customers with expert help and advice. Finally, we play even harder, in our office gym and bar, and with our lifetime access to Ubisoft games.

What does i3D.net offer you?

A challenging and dynamic job in an international company
A competitive salary (depending on education, knowledge, and experience)
25 vacation days (excluding national holidays)
Travel allowance & work-from-home budget
Collective pension scheme
All the hardware and software you need to perform, including a laptop
Career guidance including remuneration of relevant education, courses, and training
A modern office in a prime location with open workplaces
Free access to Ubisoft games through Ubisoft Connect
Free use of the in-house gym

i3D.net is an equal opportunity employer. At i3D.net, we believe in a fair and equal workplace for all and foster an environment that is inclusive as well as diverse. We do not discriminate based on color, race, religion, sexual orientation, gender (identity), age, mental or physical abilities, or other characteristics. We believe that employees thrive when they can be comfortable and be themselves! We encourage candidates to apply knowing that they will be considered solely on their merits and qualifications.

What you can expect

Did you find your next career step?

That’s great! Apply for the position with your cover letter and CV and we’ll get in touch with you as soon as we can.
If you have any questions, feel free to contact our HR department at +31 10 8900070 or via hr@i3d.net.

You may consult our privacy statement for more information on the processing of your personal data.

Apply for this Position

Address

Rivium 1e straat 1
2909 LE
Capelle aan den IJssel
The Netherlands

Inquiries

+31 (0)10 890 00 70
hr@i3d.net

Information

We do the recruiting for this vacancy ourselves. Please do not contact us for sales purposes.

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