Senior Fullstack Developer

Our client is leading in secure documentation and authentication solutions, setting the benchmark for safety and trust.

As a Senior Full Stack Developer, you’ll join the core team driving product, support and customer projects, working closely with the lead developer as a trusted sparring partner.

The ideal candidate brings a holistic view of modern IT—spanning software architecture, database design, and DevOps practices—combined with the confidence to make smart, impactful decisions.

For maximum security, all infrastructure is operated entirely on-premise.

Tasks

Product Development \& Customer Projects

– Work within the core team to maintain and enhance products while driving client-specific implementations.

Technical Partnering

– Act as a sparring partner for the lead developer, contributing to architecture, database design, and decision-making.

Security-Driven Development

– Apply DevOps practices and holistic IT expertise in an on-premise infrastructure with a strong focus on security, embedded systems, cryptography, and smart-card/PKI integration.

Requirements

Proven Full Stack Expertise

– Several years of hands-on experience, strong skills in Java (Spring Boot), JavaScript/React, microservices architecture, and scripting (Linux shell, Python).

Adaptability \& Problem-Solving

– Ability to quickly dive into large-scale legacy projects, work independently on complex engineering challenges, and deliver efficient solutions.

Professional Communication

– Broad technical perspective combined with business-fluent English for effective collaboration in international environments.

Additional Technical Skills

– Advantageous experience with TypeScript, Angular or other FE frameworks, Electron, C#, security/cryptography, embedded development (e.g. smartcard), DevOps across Linux/Windows, plus Docker and AWS.

Leadership \& Mindset

– Ownership of complex projects end-to-end, strong communication and teamwork, willingness to mentor juniors, and the ambition to grow into a lead developer role with long-term commitment.

Benefits

Join a

highly impactful long-term project

with strong growth potential.

Take

ownership

in a modern, international environment with cutting-edge technologies.

Contribute actively to building

sustainable solutions

that make a difference.

Key Facts

Project Start:

asap/September 2025

Contract Type:

Freelancer

Workload:

100%

Hourly Rate:

75 EUR

Location:

Fully remote –

work from anywhere within the EU - you need EU-work visa or permission

Language:

English

Duration:

12 months ++ (long-term commitment preferred)