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# Senior Software Engineer

- **Company:** Lcky Group
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Application Performance Management, Microsoft Azure, Cloud Computing, Software Quality, Code Review, Continuous Integration, Customer Data Management, Data Integration, Data Integrity, DevOps, Video Game Development, PCI Data Security Standards, Performance Tuning, RabbitMQ, Ansible, Tensorflow, Prometheus, Java Application Server, Enterprise Software Applications, Pytorch, Grafana, Spring-boot, Event Driven Architecture, Containerization, Gitlab-ci, Kubernetes, Infrastructure Automation Frameworks, Apache Kafka, Data Management, Cloud Migration, Api Design, Restful APIs, Terraform, Serverless Computing, Docker, Elk Stack, Legacy Systems, Jenkins, Microservices
- **Published:** September 13, 2026
- **Apply:** https://www.buscojobs.com.es/senior-software-engineer-en-madrid-ID-371684559

## About the Role

Proven experience
modernising legacy systems
in a regulated environment.
Hands?on expertise in
cloud platforms
(AWS, Azure, or GCP) and
microservices architecture.
Strong understanding of
DevOps , including CI/CD (Jenkins, GitLab CI), containerisation (Docker, Kubernetes), and infrastructure automation (Terraform, Ansible).
Experience designing and managing
APIs
and integrating
data driven features .
Experience
mentoring developers
through technical transformations.
Familiarity with
observability tools
(e.g., Prometheus, ELK Stack) and performance tuning.
Nice-to-Have
iGaming industry experience (e.g., online casinos, sports betting, or fintech for gaming).
Knowledge of event-driven architectures (Kafka, RabbitMQ) and serverless technologies.
Knowledge of AI/ML frameworks (e.g., TensorFlow, PyTorch) and their integration into applications.

## Description

We are seeking a Senior Software Engineer with more than 10 years of experience in designing and building Java applications with a proven track record of modernising legacy applications in regulated environments.In this role, you will drive cloud-based transformations, design microservices platforms, and mentor developers through complex technical transitions.Your expertise in cloud, DevOps, microservices, and API design will be critical in migrating customer data and ensuring high-performance, scalable, and compliant solutions.Experience in iGaming is a strong plus.What will you be doing?Technical Leadership & ModernisationLead themodernisation of legacy applications , ensuring they meet regulatory standards while improving performance, scalability, and maintainability.Design, develop, and deploycloud-native microserviceson AWS.Architecthigh-performance, large-scale applications in Java , optimising for efficiency, reliability, and security.Leverage AI to accelrate the refactoring of services.Cloud & DevOps TransformationDrivecloud migration strategies , including lifting, shifting, and refactoring applications for cloud compatibility.ImplementDevOps best practices , such as CI/CD pipelines, infrastructure as code (IaC), and observability tools (e.g., Prometheus, Grafana, ELK).Ensure seamlesscustomer data migrationbetween platforms, maintaining data integrity, security, and compliance.Microservices & API DevelopmentDesign and implementscalable microservices architectures in Java , leveraging RESTful APIs, with event-driven systems (e.g., Kafka, RabbitMQ).IntegrateAI-driven solutionsto enhance application intelligence, automation, and user experiences.OptimiseAPI performanceand ensure robust, secure, and well-documented interfaces.Mentorship & CollaborationMentor junior and mid-level developers, fostering aculture of code quality, innovation, and continuous learning .Collaborate withcross-functional teams(e.g., product, security, compliance) to align technical solutions with business goals.Lead code reviews, architectural discussions, and troubleshooting to ensure high standards of engineering excellence.Strong focus on automation, levergaing pipelines and AICompliance & Data ManagementEnsure all solutions adhere toregulatory and security standards(e.g., GDPR, PCI-DSS, or iGaming regulations).Implementdata protection best practicesfor managing and migrating customer data in compliance with industry regulations.Work closely with legal and compliance teams to mitigate risks and ensure auditability.Who are you?15+ years ofexperience in Javaand large-scale, high-performance applications (e.g., Spring Boot).Proven experiencemodernising legacy systemsin a regulated environment.Hands?on expertise incloud platforms(AWS, Azure, or GCP) andmicroservices architecture.Strong understanding ofDevOps , including CI/CD (Jenkins, GitLab CI), containerisation (Docker, Kubernetes), and infrastructure automation (Terraform, Ansible).Experience designing and managingAPIsand integratingdata driven features .Experiencementoring developersthrough technical transformations.Familiarity withobservability tools(e.g., Prometheus, ELK Stack) and performance tuning.Nice-to-HaveiGaming industry experience (e.g., online casinos, sports betting, or fintech for gaming).Knowledge of event-driven architectures (Kafka, RabbitMQ) and serverless technologies.Knowledge of AI/ML frameworks (e.g., TensorFlow, PyTorch) and their integration into applications.Why Join Us?Work on high-impact, transformative projects that shape the future of our regulated business.Collaborate with a talented, forward?thinking team in a dynamic and innovative environment.Access to cutting?edge technologies and opportunities for professional growth.Competitive salary, benefits, and a culture that values ownership, excellence, and mentorship.By joining us, you're not only gaining an opportunity to work and collaborate with the best talent in our industry, you'll also enjoy a range of fantastic perks!A competitive and attractive salaryPrivate health insuranceAnnual wellbeing benefit allowanceSocial events for building strong relationships with colleaguesAbout LCKY Group: LCKY Group brings together a portfolio of leading online casino brands - LuckyCasino, HappyCasino, FlaxCasino, Vera&John, OneCasino and RoyalCasino - alongside its in-house game studio, Swintt.With a strong people?led culture and a proven ability to build and scale in regulated environments, the group is well positioned to accelerate its momentum across key markets.LCKY Group continues to expand across international markets:Sweden,Finland, Ontario, and Chile , as well as inSpain, Denmark and the Netherlands .The Group is home to a diverse and multiskilled workforce, based in a range of locations, includingMalta, Stockholm, Sofia, Barcelona, Hoorn, Estepona, Gibraltar and Melilla.The Group also operates in theB2Bvertical through its in?house game development studio,Swintt , which delivers high?quality slot games to operators worldwide.With an unshakeable belief in its people that's woven into the company's DNA, LCKY Group looks boldly to the future with a focus on building appeal in regulated markets.Learn more about us at /At LCKY Group we firmly believe that our diversity is what makes us unique and that everyone is welcome to enjoy the ride!We are committed to uphold a high level of diversity and inclusion throughout our group.#J-*****-Ljbffr


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