Job title: Senior Fullstack Software Engineer
Location: Sofia, Bulgaria
Overview of the role:
We are transforming our Sofia studio into a high-performing Technology Hub, focused on building scalable, high-quality game development capabilities.
As part of this transformation, we are looking for a Senior Software Engineer to play a key role in building and evolving our products, improving engineering practices, and helping teams deliver faster, with higher quality.
This is a hands-on engineering role with growing technical leadership expectations. You will contribute directly to building systems while influencing how your team designs, develops, and delivers software.
You will work closely with engineers, tech leads, and product teams to solve complex problems, improve development workflows, and ensure we maintain high engineering standards.
This role follows a hybrid approach to working, allowing you to combine working from home with working in our modern offices. These discussions are between you and your manager to find the best pattern for you both, while recognising that quality time together is essential for keeping us mission-aligned.
Our teams work from a lively location nestled within this historic city. Enjoy the best of both worlds with winter and summer offices, tantalizing free snacks and a gaming paradise for endless entertainment.
What you’ll do:
Key Responsibilities
Design, build, and maintain scalable, high-quality software systems
Take ownership of features and components, from design through to production
Actively contribute to technical discussions, solution design, and decision-making within your team
Collaborate with product, design, and other engineers to deliver end-to-end solutions
Identify and resolve performance, scalability, and reliability issues
Write clean, maintainable, and well-tested code, following best practices
Contribute to improving engineering standards, tools, and processes
Support and guide mid-level and junior engineers, helping them grow
Participate in code reviews, ensuring quality and knowledge sharing
Contribute to continuous improvement of the development lifecycle (CI/CD, testing, automation)
Be proactive in identifying inefficiencies and opportunities for improvement
What you’ll bring:
Engineering Expertise:
Strong hands-on experience with Node.js, TypeScript, JavaScript, React
Solid understanding of Software design principles and patterns
RESTful APIs and distributed systems basics
Experience with test-driven development (TDD) and writing reliable tests
Ability to debug and resolve complex technical issues
Modern Engineering Practices:
Good understanding of CI/CD pipelines and automation, Version control and collaborative workflows (GitHub)
Familiarity with Agile ways of working (Scrum, Kanban)
Experience working in iterative, incremental delivery environments
Ownership & Mindset:
Ability to take ownership of tasks and deliver independently
Strong problem-solving skills with a practical, solution-oriented mindset
Comfortable working both independently and collaboratively
Proactive, curious, and eager to learn and improve continuously
Collaboration & Communication:
Good communication and interpersonal skills
Ability to work effectively with cross-functional teams
Willingness to contribute to a positive engineering culture
Nice to have:
Experience with AWS, Docker, Kubernetes
Exposure to high-scale or real-time systems
Experience in the gaming / gambling industry
Familiarity with AI tools and their use in development workflows
Public GitHub repository or portfolio of work
What Success Looks Like:
You consistently deliver high-quality, reliable features
You take ownership and accountability for your work
You actively contribute to team-level technical decisions
You help improve code quality, standards, and team practices
You support and uplift other engineers in your team
You contribute to faster, more efficient delivery
It’s ok if you don’t think you tick every box on this list. We love people who want to challenge themselves and are passionate about what they do. If you believe you can contribute in some areas and are eager to learn, we encourage you to apply.
Why choose us:
Aside from a generous base salary, we have a fantastic benefits & rewards program that is designed to encourage personal and career development.
Discretionary annual bonus
30 days paid leave
Health and Dental Insurance for you, your partner and your children (if you all live at the same address)
Personal life insurance and disability coverage
Wellbeing fund
Continuous learning support for certifications and career growth
550 EUR gift for newborn family member
26 weeks Maternity leave at 100% pay and 4 week secondary (Paternity) also at 100% pay, no eligibility period applies
A sports’ card membership valid across the country
Discounts as a compliment form us among different services
Monthly food vouchers
Equal opportunities:
At Flutter we are committed to creating an inclusive environment where our people can be their authentic selves and thrive. We embrace and celebrate diversity, respecting all our uniqueness and differences.
We welcome you to let us know whether you have any accessibility needs. All you need to do is email us at talent@flutterint.com. Your journey with us is focused on ensuring you have what you need to be your best self.
Learn more about the work we are doing on Inclusion and Belonging here: https://careers.flutterinternational.com/working-at-flutter-international/diversity-equity-inclusion/
The group:
Flutter Studios is a proud member of the Flutter Entertainment family, a global leader in sports betting, iGaming, and entertainment. We're not just another company; we're listed on both the prestigious FTSE 100 index on the London Stock Exchange and the New York Stock Exchange (NYSE). What sets us apart is our world class brands, cutting-edge products, and our International division includes our operations in over 100 global markets and offers sports betting, casino, poker, rummy and lottery, mainly online. What truly defines us is our commitment to ensuring that the excitement of gaming and entertainment is experienced in a responsible and sustainable way. Our remarkable team of over 8,000 colleagues drives this vision, spread across 28 offices worldwide.