Senior Backend Developer - Madrid

Fidesmo; Madrid; Híbrido; EUR 42.000 - 64.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Onboarding and training

Central Madrid office

Flexible hours and remote work

Restaurant tickets

25 days annual paid vacation

Descripción de la vacante

Fidesmo is seeking a backend engineer to join the team building services that connect to payment networks and secure devices. You will extend a microservices architecture, refine data models, and ensure performance and reliability in a fast-paced, Agile environment.

You will lead projects, participate in requirements discussions with internal teams and external partners, and help grow less experienced developers while learning domain tools and standards.

Formación

• 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.

Responsabilidades

• Build and extend backend services that connect to payment networks and partners.
• Improve data models, performance, reliability and maintainability.
• Participate in design decisions, planning and code reviews.
• Contribute to CI/CD and DevOps processes for smooth delivery.
• Lead development projects and mentor less experienced developers.

Conocimientos

Server-side

REST API design

Unit testing

Integration testing

Functional testing

External partnerships

Java/Kotlin/Scala

Small-team collaboration

English fluency

Herramientas

Docker/containerization

CI tooling

Event-driven architectures

Logging/Monitoring

Cryptography and key management

Descripción del empleo

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
• Flexible hours and remote work
• Restaurant tickets
• 25 days annual paid vacation