Solutions Developer

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Solutions Developer

About Mixvoip

We are Mixvoip, a Luxembourg-based company providing Cloud Telephony, Connectivity, Cybersecurity, and Managed IT Services to businesses and public organizations.

We design, operate, and support many of our solutions ourselves. When we see an inefficient process, a missing integration, or an opportunity to create a better customer experience, we like to build something that solves it.

That’s where you come in.

About the role

You will join Mixvoip’s IT Services team as a Solutions Developer.

Your role sits between software development, infrastructure, automation, and product design.

You will build internal tools that make our teams more efficient, automate repetitive processes, connect systems through APIs, and contribute to customer-facing products.

Projects can be very different from one another. You might build a small automation in Python, a backend service in Rust or C#, a React interface, an integration between several platforms, or a complete solution combining software, infrastructure, authentication, APIs, and physical devices.

We are therefore not looking for someone attached to one specific framework.

We are looking for someone who can understand a problem, choose an appropriate technical approach, prototype quickly, and turn the result into something secure, reliable, understandable, and maintainable.

AI-assisted development is part of how we work. You should be comfortable using coding assistants and development agents such as Codex, Claude, or similar tools to explore codebases, build features, refactor, test, document, and accelerate development.

The important part is not how much code AI can generate for you. It is whether you understand what is being built and remain responsible for the architecture, security, quality, and operation of the final solution.

Key responsibilities

Design and develop internal applications, automation, and operational tools

Contribute to customer-facing products and new commercial solutions

Translate operational or business needs into practical software solutions

Prototype ideas quickly and turn successful prototypes into production-ready systems

Work across technologies such as Rust, Python, C#, TypeScript, React, Next.js, Vite, and similar tools

Build and integrate APIs, webhooks, databases, internal systems, and third-party services

Design frontend, backend, and service components when required

Apply appropriate software architecture and design patterns without unnecessary complexity

Implement authentication, authorization, and secure handling of application data

Write maintainable, testable, and understandable code

Review both human-written and AI-generated code critically

Build automated tests and contribute to CI/CD and deployment processes

Deploy and operate applications in Linux, Windows, containerized, cloud, or on-premises environments

Troubleshoot across application and infrastructure layers, including logs, networking, databases, APIs, permissions, and services

Implement appropriate logging, monitoring, and health checks

Document architecture, dependencies, APIs, deployment procedures, and important technical decisions

Identify manual or repetitive work that could be simplified through software or automation

Work closely with systems engineers, network engineers, support teams, and other colleagues across Mixvoip

What do we need from you?

Strong software development fundamentals

Professional experience building applications, tools, automation, platforms, or software products

Experience with more than one programming language or technology stack

Strong knowledge of at least one backend language such as Rust, Python, C#, or similar

Experience with modern web development using TypeScript, React, Next.js, Vite, or comparable technologies

Good understanding of APIs, HTTP, authentication, webhooks, databases, and system integrations

Good understanding of software architecture and common design patterns

Experience with Git, code reviews, testing, and collaborative development workflows

Good understanding of application security

Good infrastructure fundamentals, including networking, DNS, HTTP/HTTPS, TLS, operating systems, permissions, and reverse proxies

Comfortable working with Linux and the command line

Familiarity with containers and modern deployment practices

Strong experience using AI coding assistants and development agents in real development work

Ability to review AI-generated solutions critically and recognize when they are incorrect, insecure, or unnecessarily complex

Ability to learn unfamiliar technologies quickly

Good documentation habits

Professional proficiency in English

You do not need to be an expert in every technology we use.

Strong fundamentals, adaptability, and good engineering judgment matter more to us than knowing a specific framework by heart.

What would make you stand out?

Experience with Rust, Python, C#, or .NET

Advanced TypeScript and React experience

Experience building internal tools or operational platforms

Experience turning manual business processes into software and automation

Experience developing customer-facing software products

Experience integrating hardware, meeting room equipment, embedded devices, or IoT systems

Experience with PostgreSQL, SQL Server, Redis, message queues, or event-driven architectures

Experience with Docker, Kubernetes, CI/CD, or infrastructure-as-code

Experience operating applications in both cloud and on-premises environments

Knowledge of OAuth2, OpenID Connect, SAML, LDAP, Active Directory, or Entra ID

Experience integrating Microsoft 365, Teams, Exchange, calendars, or meeting room technologies

Good understanding of enterprise IT infrastructure and networking

Experience with monitoring, observability, secrets management, and secure software development

Contributions to open-source projects or personal technical projects

French, German, and/or Luxembourgish

Why Mixvoip?

At Mixvoip, you will work on software that solves real problems.

An internal tool might remove hours of repetitive work every week. An integration might eliminate an entire manual process. A prototype might become a product offered to our customers.

You will work close to the people who use what you build, and across telecom, cloud, networking, cybersecurity, managed IT, software, and sometimes hardware.

This also means you can work on a solution end to end: from the initial idea and architecture to the code, infrastructure, deployment, and operation.

We encourage experimentation and rapid prototyping, while expecting production systems to be secure, reliable, and maintainable.

You will have freedom in how you solve problems, together with responsibility for the technical decisions you make.

A new way to apply: Join Mixvoip’s success story

We would like to see more than your CV.

Record a brief video with your smartphone and tell us about something you have built. It can be a commercial product, an internal tool, an automation, a personal project, or something completely different.

Tell us what problem you were trying to solve, how you approached it, and what technical decisions you made.

Please remember to attach your CV in PDF format too.

Instead of a conventional motivational letter, we would also like you to use an AI tool of your choice.

For this role, show us how you use an AI coding assistant or development agent to solve a technical problem. We are interested in how you guide the tool, what you verify yourself, and how you apply your own engineering judgment.

Eager to join the ride? We can’t wait to hear from you!

PS: Want to know who you’ll be working with? Meet me, Antoine CAVELIER

I’ve been with Mixvoip for 8 years, and my role is to help businesses make better use of their IT.

With the IT Consulting team, we support customers who often have very different realities. Some have an internal IT department and need a reliable technical partner. Others rely on us for almost everything related to their infrastructure, users, security, cloud services, networks, and day-to-day IT operations.

That variety is what makes this job interesting. One day, you may be working on Microsoft 365. Another day, you may be helping with virtualization, servers, storage, backups, Wi-Fi, Linux systems, scripts, migrations, or a customer project that does not fit neatly into one category.

I like people who are curious, structured, and honest about what they know and what they still need to learn. In consulting, nobody knows everything. What matters is the ability to understand the problem, ask the right questions, investigate properly, communicate clearly, and take ownership until things move forward.

I care a lot about practical solutions. Our customers are SMEs. They need systems that work, advice they can understand, and partners they can trust. Good consulting is not only about technical knowledge. It is also about listening, explaining, documenting, prioritizing, and staying calm when something goes wrong.

I also believe that modern IT work should make good use of the right tools, including AI. Not to replace thinking, but to speed up research, scripting, documentation, troubleshooting, and daily operations.

If you enjoy broad technical challenges, customer contact, autonomy, terminal work, small automation tasks, and the idea of helping many different businesses improve their IT step by step, then you could be a great fit for the team.

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