Software Developer

At IONOS, the leading European provider of cloud infrastructure, cloud services and hosting services, you will work together with a wide range of teams. We are characterized by open structures, a friendly working culture and flat hierarchies with a strong team spirit. We firmly believe that work and fun are compatible, and offer you the right environment for this. Our constant growth means that we are always looking for new colleagues. Become part of IONOS and grow with us.

We are building the next‑generation of Hosting  &  Mail products greenfield from the ground up and need additional software developers to help build these platforms. In this key role, you will be designing and delivering scalable, secure components that directly impact the experience of over 6 million customers, and driving predictable, high-quality delivery through effective agile practices.

We use modern development stacks and a range of languages, predominantly .NET for our front-end APIs and backend services and React/NextJS for our modern user interfaces. We work agile in our software teams with full ownership of the services we offer.

As a team, we always strive for the highest quality software development practices. This includes leveraging generative AI tools (e.g., Gemini, Copilot) for rapid prototyping, code analysis, and test-driven development, continuously improving development practices (including code quality, automated testing, CI/CD, and DevOps maturity), and performing secure software development, using security-first thinking and SSDLC principles into everyday engineering, which also includes performing code reviews of your AI-produced code and that of your peers.

Hours/work pattern:

• 40/week, Monday to Friday

• Office-based, hybrid working 2-3 days/week (with flexible start/end times to help you balance life and work)

Salary and benefits:

• £55,000 - £65,000 DOE and skills

• 27 days annual leave + bank holidays

• Contributory pension scheme up to 7.5%

• Private healthcare and life assurance

• Employee assistance programmes

• Cycle and EV scheme

• Free parking close to our office
… and more!

What experience do you need under your belt?

• Strong C#/.NET skills (API experience a plus) or React/NextJS

• Solid grasp of OO design, clean coding, and testing techniques

• Experience in distributed systems and Git workflows

• Experience using Copilot, Claude, Gemini or equivalents to accelerate software delivery in a .Net or NextJS environment

Familiarity with Python, Golang, Docker, Kubernetes, Prometheus, and Grafana is a plus—but don’t worry if you’re not an expert in all of them. We work with a broad and evolving tech stack, and you’ll have plenty of opportunities to get hands-on with these tools in real-world scenarios. If you’re curious and open to growth, you’ll be adding these technologies to your toolkit in no time.

If you thrive in complex environments, love clean code, and want to work across the full stack—from low-level service design to slick UIs—this one’s for you.

Interested?

So, like the sound of working at IONOS? We don’t blame you, we think it’s pretty great too!

Send us your application and if we think you fit the bill a member of our recruitment team will be in touch for an initial call to talk about what to expect next.

We can’t wait to hear from you!

IONOS is an equal opportunities employer, committed to fair treatment for all and value diversity in our workplace. We do not condone discrimination in any shape or form. At IONOS, your individuality is welcomed and celebrated.

Notice to Agency and Search Firm Representatives: IONOS is not accepting unsolicited CVs from agencies and/or search firms for this job posting. CVs submitted to any IONOS or affiliated employee by a third party agency and/or search firm without a valid written & signed search agreement will become the sole property of IONOS. No fee will be paid if a candidate is hired for this position as a result of an unsolicited agency or search firm referral. Thank you.

About IONOS

IONOS is the leading European digitalization partner for small and medium-sized businesses (SMB). The company serves around six million customers and operates across 18 markets in Europe and North America, with its services being accessible worldwide. With its Web Presence & Productivity portfolio, IONOS acts as a 'one-stop shop' for all digitalization needs: from domains and web hosting to classic website builders and do-it-yourself solutions, from e-commerce to online marketing tools. In addition, the company offers Cloud Solutions to enterprises who are looking to move to the cloud as their businesses evolve.

We value diversity and welcome all applications - regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age as well as sexual orientation and identity, physical characteristics, marital status or any other irrelevant factor subject to applicable law.