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 & Modernisation

Lead the

modernisation of legacy applications , ensuring they meet regulatory standards while improving performance, scalability, and maintainability.

Design, develop, and deploy

cloud-native microservices

on AWS.

Architect

high-performance, large-scale applications in Java , optimising for efficiency, reliability, and security.

Leverage AI to accelrate the refactoring of services.

Cloud & DevOps Transformation

Drive

cloud migration strategies , including lifting, shifting, and refactoring applications for cloud compatibility.

Implement

DevOps best practices , such as CI/CD pipelines, infrastructure as code (IaC), and observability tools (e.g., Prometheus, Grafana, ELK).

Ensure seamless

customer data migration

between platforms, maintaining data integrity, security, and compliance.

Microservices & API Development

Design and implement

scalable microservices architectures in Java , leveraging RESTful APIs, with event-driven systems (e.g., Kafka, RabbitMQ).

Integrate

AI-driven solutions

to enhance application intelligence, automation, and user experiences.

Optimise

API performance

and ensure robust, secure, and well-documented interfaces.

Mentorship & Collaboration

Mentor junior and mid-level developers, fostering a

culture of code quality, innovation, and continuous learning .

Collaborate with

cross-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 AI

Compliance & Data Management

Ensure all solutions adhere to

regulatory and security standards

(e.g., GDPR, PCI-DSS, or iGaming regulations).

Implement

data protection best practices

for 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 of

experience in Java

and large-scale, high-performance applications (e.g., Spring Boot).

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.

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 salary

Private health insurance

Annual wellbeing benefit allowance

Social events for building strong relationships with colleagues

About 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 in

Spain, Denmark and the Netherlands . The Group is home to a diverse and multiskilled workforce, based in a range of locations, including

Malta, Stockholm, Sofia, Barcelona, Hoorn, Estepona, Gibraltar and Melilla.

The Group also operates in the

B2B

vertical 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 https://www.lckygroup.com/

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.

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📌 Senior Software Engineer (Madrid)
🏢 LCKY Group
📍 Madrid