The team that makes our magic work is growing: will you be a part of it? Company Description: Fidesmo is a leading technology company based in Stockholm with a research and development center in Madrid. We are building a platform to distribute contactless services to any device having a secure chip: in other words, we want that any watch, bracelet, ring, piece of clothing or even subcutaneous implant (yes, you read right) can be used to pay for a purchase, hop on the train, get inside an office building or rent a car. Our most successful service is Fidesmo Pay, launched together with Visa, Mastercard, banks and a select group of manufacturers of wearable devices: for example, we are the ones powering Swatch Pay and the payments solution in Honor latest smartwatches.

This requires writing code that runs on a chip with only a few kilobytes of RAM, or very scalable server code, or clients for the main environments (iOS, Android, web and also command line). By building our own product we are free from the typical pressure coming from contract development: we program with quality following our own rules.

Role Description: You will be part of the backend team, building the services that connect to payment networks, public transportation authorities, etc, and also to secure chips on devices. You will extend our microservices architecture, understand and modify our data model, ensuring performance, reliability and maintainability.

We follow an Agile methodology for software development; you will participate in design and implementation decisions and contribute to planning and code reviews.



You will participate and improve the continuous integration and devops processes.

We expect that you will lead development projects, participating in requirements discussions with other teams in the company and also with external partners. You will contribute with your experience and help less experienced developers, while also learning domain-specific tools and standards.

We welcome developers who are willing to experiment with new technologies, prototype and use what works best. Fidesmo will train you in the specific programming languages, cryptography and other domain knowledge necessary for the job.

Qualifications

3–5 years professional experience building server-side applications

REST API design experience; able to make and defend architecture decisions

Experience writing/maintaining unit, functional, and integration tests

Experience gathering requirements and working with external partners/customers

Deep knowledge of Java, Kotlin, or Scala

Enjoys collaborative, small-team work with mutual code review

Comfortable working in English day-to-day

Nice to have

Functional programming experience

Docker/containerization, CI tooling, event-based architectures, logging/monitoring

Cryptography and key management experience

What's offered

Onboarding with formal + on-the-job training alongside experienced developers

Central Madrid office, well connected by Cercanías/Metro/bus

Versátil hours and remote work

Restaurant tickets

25 days annual paid vacation

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📌 Senior Backend Developer - Madrid
🏢 Fidesmo
📍 Madrid