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Senior Full Stack Developer

OnchainLabs AGSanlúcar, Andalucía, España

Hace más de 30 días

Descripción del trabajo

Help Shape the Future of Digital Ownership

At OnchainLabs , we’re building WalletTwo — the invisible, intuitive wallet infrastructure powering the next generation of digital customer experiences. From loyalty systems and proof-of-authenticity to digital product passports, our plug-and-play solutions let brands integrate blockchain-backed tools without needing to speak “blockchain.”

We’ve already helped companies like Denario, zai, and CrowdTransfer launch secure, branded wallets — now we’re scaling fast. And that’s where you come in.

Your Role

We’re looking for a Senior Full Stack Developer to join us in the heart of our product engine. You’ll work closely with our CTO and collaborate across our product, design, and blockchain teams to ensure a robust, secure, and scalable infrastructure.

You’ll help us :

Develop and maintain our backend services and deployment pipelines
Improve architecture, scalability, and performance across our stack
Analyze systems and processes to identify and track areas for improvement
Support the integration of APIs, SDKs, and 3rd party systems
Enable developers across the team with well-structured CI / CD pipelines
Drive documentation and transparency in all deployments

What We’re Looking For

Proven experience as a backend or full stack developer

Strong knowledge of modern backend frameworks (Node.js, Python, or similar)

Experience with Docker, CI / CD, and infrastructure-as-code tools

Familiarity with cloud platforms (AWS, GCP, or similar)

Solid understanding of databases (SQL / NoSQL)

Highly collaborative, proactive communicator (English is a must)

Based in a European timezone

No need for prior blockchain dev experience — we’ve got experts for that. But curiosity about Web3 is always welcome.

Bonus Points If You

Are located in or near Spain and can occasionally work hybrid with our local team

Have experience with secure systems or fintech environments

Enjoy taking ownership of dev processes and mentoring junior engineers

What You Get

Modern, family-friendly flexibility — we believe great work happens when life works too

100% remote-first culture with optional hybrid setup if you are near our hub in Sanlúcar, Spain

Join a mission-driven team building real-world products with visible impact

Be part of a well-funded startup backed by CHF 5M and growing fast

Work alongside highly skilled, kind people who care about product, not ego

Ready to redefine the digital customer experience with us?

Send us your LinkedIn, GitHub, or whatever you’re proud of — we’ll take it from there.

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Senior Developer • Sanlúcar, Andalucía, España