Full Stack Developer -Python · React · SaaS · Accounting Automation

Aspyre; Den Haag; Hybrid; EUR 60,000 - 85,000; Full time

Benefits offered by this job

Hybrid schedule

BYOD device

Job summary

Aspyre in Den Haag is seeking a Medior/Senior Full Stack Developer to help build the next version of our accounting automation platform. You'll work across React frontend and Python backend, connecting to external accounting systems and databases.

Join a startup culture that balances quality and speed, with a hybrid 40-hour week and in-office Tue/Thu in Den Haag. You should thrive solving technically challenging problems and be comfortable with Dutch in a business environment.

Qualifications

• Strong Python skills and experience building real applications.
• TypeScript & React experience across frontend.
• Relational databases knowledge, PostgreSQL and performance optimization.
• REST API experience; SOAP integrations acceptable.
• Critical thinking and willingness to learn accounting domain.

Responsibilities

• Evolve architecture into a scalable, production-ready platform.
• Define boundaries between data/integration, business, and output layers.
• Improve backend performance, reliability, and scalability.
• Develop and maintain integrations with external APIs.
• Design and optimize the PostgreSQL data layer.
• Build features in Python and React and connect frontend to backend.
• Collaborate with a close-knit, trusted team.
• Balance quality and speed in a startup environment.

Skills

Python

TypeScript

React

PostgreSQL

REST API

SOAP API

Critical thinking

AI-assisted development

Dutch

Accounting knowledge

Job description

40 hours · Hybrid · Den Haag HS · Tuesday & Thursday in the office

Join the revolution of Accounting Automation

AI is all you read about these days. It promises us that every job will be replaced by it and with it over the coming years.

Sounds really cool, but also scary. There is a significant business category out there that is set to be replaced if they do not innovate in their respective field. That is where Aspyre plays a role: our goal is to make existing accountants 4x more productive, allowing them to grow far beyond their current customer base without growing their headcount.

We do this by connecting with existing software systems used by accountants and building automations for high-effort, low-revenue work. We combine auditable and deterministic code with AI to leverage the best of both worlds, and invite YOU to join us on our mission.

Build the next version of Aspyre

With our current product we have attracted early customers and proven early traction. We've moved fast to validate what accountants actually need. Now we're entering the next phase.

We want to turn that early stage product into a stable, fast and scalable product that accounting firms can rely on 24/7. That means improving architecture, performance, separating responsibilities, and continuing to ship new innovative functionality.

And that's where you come in.

What you'll work on

As a Full Stack Developer, you'll work across the product: from React interfaces to Python backend logic, databases and integrations with external accounting systems.

One day you might optimize a slow data flow. The next, you're restructuring part of the backend or figuring out why an obscure SOAP API behaves differently from its documentation.

What you’ll be doing:

• Continually evolve our architecture into a scalable and production-ready platform.
• Create clear boundaries between our data/integration layer, business layer and output layer.
• Improve backend performance, reliability and scalability.
• Develop and maintain integrations with external APIs.
• Design and optimize our PostgreSQL data layer.
• Build new product functionality in Python and React.
• Connect frontend to backend, and turn visual prototypes into production-ready code.
• Collaborate with a super cool team.

We care about quality, and strongly believe that it should be balanced with speed. You'll need to understand when something needs to be engineered properly and when getting something into users' hands matters more. As we are a startup we expect you to understand this delicate balance between quality and speed.

What we're looking for

You don't need to know absolutely everything. We care more about whether you can reason about unfamiliar problems and learn quickly.

You should have:

• Strong Python skills and experience building real applications with it.
• TypeScript & React experience. You should be comfortable working across the frontend rather than considering yourself backend-only.
• Solid database knowledge. You understand relational databases, PostgreSQL and the fundamentals of database design, querying and performance optimization.
• API experience. REST should be familiar territory, and you shouldn't be afraid of less pleasant integrations such as SOAP APIs.
• Critical thinking. If you think an architectural decision we've made is wrong, we want you to say so and explain what you'd do differently and why.
• Practical experience with AI-assisted development. We are looking for someone who knows how to get leverage from AI agents without blindly trusting what they produce. If OpenAI or Anthropic suddenly stop working, we don't want that to leave you stranded.
• Basic Dutch proficiency. You don't need perfect Dutch, but you should be able to function in a Dutch-speaking environment.
• Some understanding of accounting or the willingness to learn it. You don't need to be an accountant. You do need to understand the domain you're building for. It’s a plus if you enjoy working in the field

The kind of developer we'd like to work with

You enjoy doing technically difficult things with people you can trust and laugh with.

You're ambitious about becoming better at what you do, but don't need to prove that you're the smartest person in the room. You ask questions, challenge assumptions and expect others to challenge yours.

Your ideas will be heard and your work matters. You will regularly see what you've built actually running in production and being used by customers.

Aspyre probably isn't the right environment if you're looking for rigid specifications to simply execute, or if you believe seniority means your opinion shouldn't be questioned.

• Hours: 40 hours per week
• Hybrid: Tuesday & Thursday in the office; remaining days from home
• Device: Bring your own device
• Level: Medior / Senior Full Stack Developer