Junior Backend Developer - Madrid

Fidesmo; Madrid; Híbrido; EUR 40.000 - 65.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Restaurant tickets

25 days annual paid vacation

Flexible hours and remote work

Central Madrid office

Descripción de la vacante

Fidesmo invites you to join its Madrid R&D center as a backend engineer. You will build services that connect to payment networks, transit authorities, and secure chips, learning cryptography and secure key handling in a highly concurrent environment.

You will participate in CI/DevOps, design and implementation reviews, and agile planning. The team encourages experimentation with new tech and growth toward ownership of subsystems and contributions across libraries.

Formación

• University degree in computer science, maths, physics, or engineering.
• Comfortable with abstract thinking and complexity.
• Working knowledge of at least one programming language.
• Some server-side coding experience.
• enjoys collaborative, small-team work with mutual code review.
• Comfortable working in English day-to-day.
• Nice to have: Functional programming knowledge.
• Nice to have: Interest in cryptography and security tech.

Responsabilidades

• Backend services connecting to payment networks, transit authorities, and secure chips.
• Learn to implement cryptography correctly and manage keys securely in a highly concurrent environment.
• Participate in CI/DevOps and Agile processes; join design/implementation discussions, planning, and code reviews.
• Grow to own one or more subsystems and contribute to other projects/libraries.

Conocimientos

Programming language knowledge

Server-side coding

Collaborative teamwork

English communication

Cryptography interest

Educación

University degree in computer science, maths, physics, or engineering

Descripción del empleo

The team that makes our magic work is growing: will you be a part of it?

About us

Stockholm HQ with a Madrid R&D center, building a platform so any device with a secure chip can pay, access transit, enter buildings, etc. Fidesmo Pay is their flagship, launched with Visa, Mastercard, banks and wearable makers — powering Swatch Pay and Honor's smartwatch payments. Work spans tiny-footprint chip code up through scalable server code and iOS/Android/web/CLI clients, developed in-house under their own quality bar.

Backend team role building the services connecting to payment networks, transit authorities, and secure chips. You'd learn to implement cryptography correctly and manage keys securely in a highly concurrent environment, and take part in CI/DevOps. Agile process — you'd join design/implementation discussions, planning, and code reviews. The expectation is you grow alongside more experienced developers until you own one or more subsystems and contribute to other projects/libraries. Open to experimenting with new tech; they'll train you in the languages, crypto, and domain knowledge needed.

Requirements

• University degree in computer science, maths, physics, or engineering
• Comfortable with abstract thinking and complexity
• Working knowledge of at least one programming language
• Some server-side coding experience
• Enjoys collaborative, small-team work with mutual code review
• Comfortable working in English day-to-day

Nice to have

• Functional programming knowledge
• Interest in cryptography and security tech

What's offered

• Onboarding with formal + on-the-job training alongside experienced developers
• Central Madrid office, well connected by Cercanías/Metro/bus
• Flexible hours and remote work
• Restaurant tickets
• 25 days annual paid vacation