Group Senior Software Developer

FEG; Madrid; Hybrid; EUR 75,000 - 125,000; Full time

Benefits offered by this job

Hybrid work

Job summary

Fortuna Entertainment Group in Madrid is seeking a Senior Software Engineer to design and deliver a next-generation Player Account Management platform. You will own architecture and engineering standards, ensuring transactional correctness, data integrity, and operational resilience in hard distributed systems within regulated environments.

You will lead architecture decisions, implement core services, and partner with DevOps, security, and product teams to deliver robust software and deliver

Qualifications

• 8+ years of backend engineering experience in mission-critical systems.
• Strong Java and Spring Boot experience in production environments.
• Solid understanding of concurrency, transactions, and JVM memory model.
• Production experience with messaging systems (Kafka, RabbitMQ, or similar).
• Strong SQL knowledge: transactions, isolation levels, indexing, performance tuning.
• Experience with distributed systems and eventual consistency patterns.
• Experience with containerised environments (Docker).
• Familiarity with caching strategies (Redis or similar).
• Security awareness (authentication flows, input validation, encryption in transit and at rest).
• Experience with observability tools (Prometheus, OpenTelemetry, or similar).
• Demonstrable curiosity and hands-on experimentation with AI-assisted development tools.

Responsibilities

• Design and implement core services (identity, transactional flows, data integrity) within an event-driven architecture.
• Build asynchronous workflows with strong guarantees: idempotency, consistency, and auditability.
• Design high-performance REST APIs with clear contracts and versioning.
• Implement distributed transaction patterns and reason about compensation and eventual consistency.
• Apply concurrency control to ensure correctness under concurrent writes.
• Build resilient systems with circuit breakers, retries, timeouts, and graceful degradation.
• Manage schema evolution with zero-downtime migrations.
• Integrate authentication and authorisation solutions.
• Write meaningful automated tests as part of daily development.
• Instrument services with metrics and structured logging.
• Build back-office tools and embeddable UI widgets on top of APIs.
• Contribute to infrastructure, CI/CD, and DevOps practices.
• Use AI-assisted development tools to improve productivity and quality.

Skills

Java

Spring Boot

Distributed systems

Concurrency control

REST APIs

Education

Bachelor's degree in Computer Science

Tools

Docker

Kubernetes

Redis

Kafka/RabbitMQ

Job description

About Our Company

Fortuna has become an established brand among customers within just a few years. We became a proud international Family of companies carrying Fortuna Entertainment Group from the first betting shop.

Madrid, ES, 28045

Let's play together

About Our Company

Fortuna has become an established brand among customers within just a few years. We became a proud international Family of companies carrying Fortuna Entertainment Group from the first betting shop.

Hey there!

We're Fortuna Entertainment Group, and we're excited to share why we're a team worth joining.

Who We Are?

Founded in 1990, FEG is a top player in the betting and gaming industry. We proudly serve millions of customers across seven European countries – the Czech Republic, Slovakia, Poland, Romania, Croatia, Montenegro, and Lithuania – with our Business Intelligence operations based in India and two hubs in London and Madrid.

Why Join Us?

You'll be part of a team that embraces bold ideas and delivers on its promises. We're committed to providing exceptional betting and gaming experiences tailored to our customers’ needs, bringing fun and games to them. We also know that behind these experiences is a great team, which is why we invest in and value each of our colleagues.

Where We Work?

Our vibrant Prague office, located in the modern Churchill II building, is where work meets fun! Enjoy perks like our very own barista, 24/7 company gym, a game room, and a relaxed atmosphere where colleagues are as friendly as they are skilled.

Current Opportunity

We are seeking a Senior Software Engineer to join our Group Technology Team in Madrid (Hybrid). You will be responsible for designing and delivering a next-generation Player Account Management platform, engineered for transactional correctness, data integrity, and operational resilience. The candidate should be able to take complete ownership of the architecture and engineering standards that future teams will build upon, while fostering a culture of technical excellence. You will work on hard distributed systems problems in regulated environments where failure modes must be explicitly designed, audited, and traceable.

What You'll Be Doing

The main responsibilities are to:

• Design and implement core services (identity, transactional flows, data integrity) within an event-driven architecture.
• Build asynchronous workflows with strong guarantees: idempotency, consistency, and auditability.
• Design high-performance REST APIs with clear contracts and versioning.
• Implement distributed transaction patterns (sagas/orchestration or choreography) and reason about compensation and eventual consistency.
• Apply concurrency control (optimistic/pessimistic locking, distributed locking) to ensure correctness under concurrent writes.
• Build resilient systems using circuit breakers, retries, timeouts, and graceful degradation patterns.
• Manage schema evolution with zero-downtime migrations (Flyway, Liquibase, or similar).
• Integrate authentication and authorisation solutions (Keycloak or similar).
• Write meaningful automated tests (contract, integration, e2e) as part of daily development.
• Instrument services from day one (metrics, structured logging, tracing).
• Build back-office tools and embeddable UI widgets on top of the platform APIs.
• Contribute to infrastructure, CI/CD, and DevOps practices in collaboration with the team.
• Use AI-assisted development tools pragmatically to improve productivity and quality.

What We're Looking For

You should have experience in:

• Higher education diploma in Computer Science or a related field, or equivalent practical experience.
• 8+ years of backend engineering experience in systems where correctness and reliability mattered.
• Strong Java and Spring Boot experience in production environments.
• Solid understanding of concurrency, transactions, and the JVM memory model.
• Production experience with messaging systems (Kafka, RabbitMQ, or similar).
• Strong SQL knowledge: transactions, isolation levels, indexing, performance tuning.
• Experience with distributed systems and eventual consistency patterns.
• Experience with containerised environments (Docker).
• Familiarity with caching strategies (Redis or similar).
• Security awareness (authentication flows, input validation, encryption in transit and at rest).
• Experience with observability tools (Prometheus, OpenTelemetry, or similar).
• Demonstrable curiosity and hands-on experimentation with AI-assisted development tools (GitHub Copilot, Claude, ChatGPT, Cursor, or similar).
• Fluent English and strong communication skills.

Nice To Have

• Experience in fintech, payments, iGaming, or other regulated domains.
• Keycloak customisation or identity federation.
• Experience building internal tools or back-office applications with a modern JavaScript/TypeScript framework (React, Vue, Angular, or similar).
• Kubernetes experience.
• Stream processing (Flink or similar).
• Event schema evolution (Avro/Protobuf, Schema Registry).
• Experience in small, high-ownership teams.

Why You'll Love It Here

The specific compensation and benefits associated with this role may differ based on the hiring location, in order to remain compliant with local practices and competitive within each market.

Offices at FEG

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