Fullstack Developer: Fintech SaaS

Who are we?

At TaxMate we do bookkeeping a little differently. We are a dynamic start-up focused on financial and fiscal services for sole proprietors, partnerships and freelancers. From our office on the Singel in Amsterdam we combine smart technology with the expertise and personal approach of a traditional accounting firm.

We are building a new way of doing bookkeeping: faster, clearer and more accessible for entrepreneurs. With a young and ambitious team we develop not only our services, but also our own software: MyTaxMate.

Your role

As a Fullstack Developer you help build MyTaxMate, our own accounting web app. This software supports entrepreneurs with everything around their administration: from bookkeeping functionality to time tracking, trip registration, invoicing and other tools that make daily work easier.

MyTaxMate is currently used within our own services, but our ambition goes further. Ultimately we want to launch the platform as a standalone SaaS solution for entrepreneurs and accounting firms. So you get the chance to help build a fintech product with serious growth potential from an early stage.

You work on maintaining and improving the existing codebase, fixing bugs and developing new features. Think of integrating payment solutions such as Mollie, building quotation modules and developing integrations with e-commerce platforms such as Shopify and bol.com.

We also actively think about how AI can make our software, processes and development workflow smarter. We deploy AI purposefully where it truly adds value for the product and the organisation. Think of AI-supported automations within bookkeeping processes, smart internal tooling, agentic AI in DevOps, testing and monitoring, and further AI integrations that save our clients and our team time every day.

In addition to the web app we also have a mobile app for iOS and Android. Experience with mobile development is not a hard requirement, but a nice plus. Think of experience with React Native, Swift, Expo, EAS, app builds, releases or App Store / Play Store deployment.

What do we expect from you?

• You are available 32–40 hours per week.

• You have a technical background, for example through a degree in Computer Science, Artificial Intelligence, Mathematics, Physics, Econometrics or a similar field, or through relevant work experience as a developer.

• You have experience with programming and understand how to build structured, maintainable software.

• Experience with Python, React and SQL is desirable. Experience with other high-level languages such as C#, C++ or Java is also valuable.

• You have experience with Git and are used to collaborating in a codebase.

• You are analytical, creative and precise.

• You have an affinity with finance, fintech, SaaS and automation.

• You think product-oriented: you don't just build what is asked, but think along about what users really need.

• You communicate clearly and collaborate easily with the rest of the team.

Nice to have

• Experience with React Native, Swift or mobile app development.

• Experience with Expo and EAS.

• Experience with CI/CD, app releases or DevOps processes.

• Experience with cloud platforms, API integrations or payment integrations.

• Interest in AI agents, automation workflows and AI-assisted development.

• Experience with fintech, accounting software or SaaS products.

What can you expect from us?

• A role in which you help build a fintech platform with SaaS ambition from an early stage.

• A lot of freedom and responsibility in technical and product choices.

• A dynamic and inspiring work environment on the Singel in Amsterdam.

• Working with a young and ambitious team that wants to make bookkeeping smarter and more accessible.

• Flexibility in workplace and working hours, including the possibility to work from home.

• The chance to work on web, mobile, AI, automation and fintech integrations.

• A salary starting from €4,000 gross per month, depending on experience.

• The opportunity to make a direct impact on the product, the user experience and the growth of TaxMate.