Senior Backend Engineer - Security Subsystem

Santander; Madrid; Híbrido; EUR 60.000 - 80.000; Jornada completa

Descripción de la vacante

Open Digital Services in Madrid is seeking a Backend Software Engineer to join our hybrid/remote team within Spain. You will build backend services and secure APIs, shaping secure customer journeys and scalable infrastructure.

You will work with senior engineers to turn requirements into maintainable designs, improve testing and documentation, and contribute to data modelling, caching, and observability with strong Go or Java skills and English language proficiency.

Formación

• +4 years of backend experience with Go or Java.
• Experience with APIs, data structures, databases, testing and version control.
• Ability to debug production or production-like environments.

Responsabilidades

• Design, implement, test, deploy, and operate backend services and APIs.
• Turn requirements into maintainable designs with senior engineers.
• Write clear, well-tested code and improve testing and docs.
• Build observability using logs, metrics and traces in production.
• Participate in on-call rotation and investigate incidents.
• Contribute to data modelling, caching, async processing and performance.
• Participate in code and design reviews and own larger service areas.

Conocimientos

Backend development Go

Backend development Java

APIs

Distributed systems concepts

Testing

Version control

Herramientas

AWS

Redis

DynamoDB

PostgreSQL

Event-driven architecture

Descripción del empleo

Country: Spain

Open Digital Services is the software development company of Santander Group powering the next generation of banks by creating innovative banking products and implementing them in collaboration with Santander Group Affiliates. Santander Group is one of the world's largest financial institutions and the Eurozone's leader, we're committed to being the best Digital Bank with Branches in the industry.

Our mission at ODS is to design and support an advanced digital and omnichannel platform, ensuring the best customer experience using cutting-edge technology. Openbank, our flagship partner, is where we develop our most advanced concepts first. Be part of our Best-in-Class team and help us create unique value for our customers!

Open Digital Services is looking for a Backend Software Engineer based out of Madrid following a hybrid setting or remote within Spain.

Build shared security services used by multiple products and markets, focusing on reliable APIs, state and session management, authentication and authorization flows, security controls, and the operational foundations that keep these services available and understandable.

Responsibilities

We’re shaping the way we work through innovation, cutting-edge technology, collaboration and the freedom to explore new ideas. To succeed in this role, you will be responsible for:

• Design, implement, test, deploy, and operate backend services and APIs used in security-critical customer journeys.
• Turn requirements into maintainable designs and incremental delivery plans with senior engineers and Team Leads.
• Write clear, well-tested code and improve automated testing, documentation, and developer workflows.
• Build observability into services and use logs, metrics, and traces to understand production behavior.
• Participate in sustainable on-call rotation, investigate incidents, and help remove root causes.
• Contribute to data modelling, caching, asynchronous processing, resilience, and performance improvements.
• Take part in code and design reviews and progressively own larger service areas and decisions.

What You’ll Bring

Our people are our greatest strength. Every individual contributes unique perspectives that make us stronger as a team and as an organization. We’re enabling teams to go beyond by valuing who they are and empowering what they bring.

The following requirements represent the knowledge, skills, and abilities essential for success in this role. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

Professional Experience

• +4 years of professional experience building backend applications or services in Go or Java (Required)
• Good understanding of APIs, data structures, databases, testing, version control, and basic distributed systems concepts. (Required)
• Experience debugging software in production or production-like environments. (Preferred)

Language

• English (Required)
• Spanish (Preferred)

Hard Skills

• APIs, data structures, databases, testing, and version control. (Required)
• Distributed systems concepts, caching, asynchronous processing, resilience, and performance. (Required)
• AWS, Redis, DynamoDB, PostgreSQL, or event-driven architecture. (Required)

Soft Skills

• Strong analytical and problem-solving mindset.
• Clear communication and collaboration with engineers and stakeholders.
• Willingness to ask for help at the right time and learn unfamiliar systems.
• Quality mindset covering maintainability, edge cases, security, monitoring, and failure handling.

READY TO TAKE THE NEXT STEP IN YOUR JOURNEY?

Open Digital Services is an equal opportunity employer. All applicants will be considered as equal without paying attention to gender identity, sexual orientation, ethnicity, religion, age, political orientation, union membership nor disability status.

We make recruiting decisions based on your experience and skills. We value your passion to discover, invent, simplify, and build.

The personal data you provide as well as any data generated during the selection process are confidential and will be processed by Open Digital Services, S.L. with registered office at Plaza de Santa Bárbara 2, 28004 (Madrid), Madrid, Spain for the sole purpose of managing your participation in the selection processes and, where appropriate, to formalise your recruitment. For further information about your rights and data protection, please read the Open Digital Services Privacy Policy applicable to this type of data processing here