Senior Back-End Developer

• A gross salary of €4,800 – €6,200 per month based on a full-time work week, depending on your knowledge and experience;

• An attractive bonus scheme (with a permanent contract), through which you can earn up to 150% of your gross monthly salary;

• 28 vacation days per year with full-time employment;

• A pension scheme with a 10% employer contribution;

• From digital to close by: four times a year you meet your Portuguese colleagues, twice in Porto and twice in the Netherlands;

• A vitality scheme of €25 net per month and extra benefits via a.s.r. Vitality;

• Hybrid working with a maximum of 2 days per week at home;

• Challenging work in a fast-changing environment with plenty of room for your own input and personal development;

• An inspiring workplace in Eersel, a close-knit and friendly team with a strong sense of "we." On Fridays, we stop an hour early and ring in the weekend together with a cozy Friday afternoon drink.

Do you want to not only help build a platform, but also determine how it remains secure, fast, and scalable in the coming years? As a Senior Back-end Developer at Nmbrs Invoicing, you will lead large technical projects, provide direction to our architecture, and help other developers grow. You will be given all the space to take our technology to a higher level!

Time to grow. Time to thrive.

We are Nmbrs. We create smart business software that removes unnecessary complexity for SME entrepreneurs and the professionals who support them. Nmbrs brings together four established product organizations—Payroll, Accounting, Invoicing, and Reporting—with teams in the Netherlands, Sweden, and Portugal.

We are one brand with a shared ambition, while we continue to work from the expertise and strength of our own organizations. We bundle our strengths where it makes sense and keep teams, expertise, and decision-making close together.

For this position, you will be working at Nmbrs Invoicing in Eersel. You will work closely with your direct colleagues at this location and simultaneously be part of the broader Nmbrs organization.

As a Senior Back-end Developer at Nmbrs Invoicing, you are the technical driving force behind our platform. You design APIs and services, monitor the architecture, and ensure that our platform remains secure, scalable, and reliable. You work in a multidisciplinary team following the scrum method, in two-week sprints. Our local development environment runs in Docker and we develop in PHPStorm. We write new code in Symfony, with views in Twig and VanillaJS. Because our product has existed for more than 20 years, you will work with both legacy code and new, strict PHP code.

Specifically, you will:

• Architecture & direction: you develop and monitor architectural guidelines, including security, scalability, and performance principles;

• APIs & integrations: you design and develop APIs and services, and build and maintain integrations with external systems, third-party APIs, and enterprise environments;

• Leading technical projects: you lead (large) technical projects, from concept to realization;

• Performance & reliability: you optimize databases, data flows, and infrastructure, and monitor and improve performance, security, and reliability at the platform level;

• Quality & coaching: you perform thorough code reviews and actively coach medior and junior developers;

• Innovation & roadmap: you evaluate and introduce new technologies and tools, make a significant contribution to strategic and technical decisions, and collaborate with other teams to identify technical opportunities, risks, and innovations across the organization.

Through your work, you ensure that our platform not only works well today, but is also ready for the growth of the coming years. You help determine how we build, which technology we choose, and how we guarantee quality, security, and speed for tens of thousands of entrepreneurs and over 1,000 accounting and administration firms.

Imagine: the number of invoices flowing through our platform is growing rapidly and certain processes are starting to slow down. You analyze where the bottlenecks are, propose a solution (for example, a different caching strategy, a smarter data flow, or splitting a component into a separate service), and lead the project from design to go-live. Along the way, you bring colleagues along in your choices, so the entire team learns from them.

Additionally, you help build the technical foundations of our organization. With clear architectural guidelines, a strong review culture, and the introduction of new tools and techniques, you ensure that our stack remains future-proof. In this way, your work has a direct influence on how Nmbrs Invoicing grows technically in the coming years.

You have deep technical insight, a strategic vision, and the drive to continuously take our technology to a higher level. You like to take the lead, can provide clear substantiation for complex choices, and enjoy helping other developers grow.