Staff Engineer — Labs & Platform

The role

This role is split between Labs and the backend platform. You will build experiments in Labs and maintain the AWS-native serverless production backend.

What you will do

• Turn ideas into working things quickly.
• Build and maintain production backend with the engineering team.
• Decide which prototypes live or die.
• Lead and grow a team of 2–3 UPC interns.
• Break work down into tasks for juniors.
• Build with AI using AI-assisted workflows.
• Set standards for Labs projects including tests, docs, and security reviews.

Required qualifications

• TypeScript, Node and AWS in production.
• 4+ years shipping software in production.
• Owned at least one thing end to end from the first line to real users.
• Generalist range across various project types.
• Proactive and creative with real autonomy.
• Fluency with AI-first workflows.
• Experience mentoring or leading engineers.
• Wants to continue writing code.
• Professional English (C1+).
• Professional Spanish (C1+).

Nice to have

• Experience with payments, fintech or any regulated environment: card acceptance, PCI, tokenization, SEPA, open banking.
• Rapid-prototyping tools (Lovable, v0 and similar) used on real projects.
• Mobile development (Swift, Kotlin or React Native).
• Previous experience working with university interns or in an academic partnership (UPC, UMA or similar).
• Contributions to open source, technical writing or community involvement.
• Quantified impact.

Benefits

• Competitive salary.
• Hybrid work: two days a week from our Málaga or Barcelona office, three days remote.
• AI tools on us (Claude, Cursor, etc.).
• Real ownership: your decisions reach production, and merchants, within days.

About the company

MONEI is revolutionizing omnichannel payments for top brands across Southern Europe. Their serverless architecture earned recognition as the AWS Startup Architecture of the Year (Iberia region).