Senior Software Engineer

-

About Betfair Romania Development​:

Betfair Romania Development is the largest technology hub of Flutter Entertainment, with over 2,000 people powering the world’s leading sports betting and iGaming brands. Exciting, immersive and safe experiences are delivered to over 18 million customers worldwide, from our office in Cluj-Napoca. Driven by relentless innovation and commitment to excellence, we operate our own unbeatable portfolio of diverse proprietary brands such as FanDuel, PokerStars, SportsBet, Betfair, Paddy Power, or Sky Betting & Gaming.

Our Values:

The values we share at Betfair Romania Development define what makes us unique as a team. They empower us by giving meaning to our contributions, and they ensure that we consistently strive for excellence in everything we do. We are looking for passionate individuals who align with our values and are committed to making a difference.

Win together | Raise the bar | Got your back | Own it | Positive impact

About PokerStars:

PokerStars brings a world of epic entertainment to communities. Encompassing PokerStars, PokerStars Sports and PokerStars Casino, they are a true entertainment destination for millions of registered players globally.

Role Overview:

As Senior Software Engineer (Java), you will lead the modernisation of Pokerstars backend services that currently limit our delivery speed, scalability and cost-efficiency. You will be the primary technical authority for re-architecting critical Java services, including wallet and account management, moving them towards cloud-native, event-driven and independently deployable designs.

You will set the technical bar across teams, mentor senior and mid-level engineers, and turn modernisation plans into measurable gains in throughput, latency and run cost.

Key Accountabilities & Responsibilities:

Modernisation & Re-architecture

• Lead decomposition of legacy Java services into well-bounded, independently deployable components, with migration paths that keep live poker traffic uninterrupted.

• Define the target architecture for wallet, account and integration services, applying strangler-fig and event-driven patterns where they remove coupling.

• Modernise the Java estate: drive runtime, framework and library upgrades (Java 11+ to current LTS, Spring Boot) and retire unsupported dependencies on a planned cadence.

• Reduce cost per transaction by right-sizing compute, tuning JVM and data-access layers, and tracking run cost as a service-level metric.

Integrations & Platform

• Govern API contracts for REST and gRPC, with versioning and backwards compatibility, so partner and internal integrations can evolve without breaking.

• Build resilient integration patterns (idempotency, retries, circuit breakers, Kafka-based eventing) for critical financial flows.

• Evaluate new runtimes with Architecture, including Rust for performance-critical or high-risk components, and run proofs of concept against clear success criteria.

Technical Authority & Mentorship

• Set and enforce standards for code quality, security and automated test coverage across modernised services.

• Mentor senior and mid-level engineers on reactive programming, JVM performance and cloud-native design.

• Establish SLOs and error budgets for migrated services; lead incident response and post-mortems through to prevention.

• Communicate trade-offs in terms of speed, cost and risk, so product and leadership can decide with confidence.

Skills & Capabilities Required:

• 7-10 years of professional software engineering, with hands-on Java in large-scale, mission-critical backend systems.
• Expert Java and Spring Boot, with working knowledge of JVM internals and profiling (JFR, async-profiler).
• Distributed systems: Kafka or similar messaging, eventual consistency, and idempotent design for financial transactions.
• Cloud-native delivery: Kubernetes, AWS (RDS, DynamoDB, SNS/SQS, ECS) and Terraform.
• Cost awareness: ability to model and reduce infrastructure and operational cost for services at scale.
• Technical leadership: a record of mentoring senior engineers and communicating with non-technical stakeholders.
• Rust (highly valued): hands-on experience building or evaluating Rust services.
• Regulated industry experience in iGaming, fintech or high-frequency transaction processing, including PCI-DSS or similar standards.
• Observability and SLO frameworks in cloud-native environments; GraphQL federation and subscriptions.

Benefits:

• Hybrid & remote working options
• €1,000 per year for self-development
• Company share scheme
• 25 days of annual leave per year
• 20 days per year to work abroad
• 5 personal days/year
• Flexible benefits: travel, sports, hobbies
• Extended health, dental and travel insurances
• Customized well-being programmes
• Career growth sessions
• Thousands of online courses through Udemy
• A variety of engaging office events

Disclaimer:

We are an inclusive employer. By embracing diverse experiences and perspectives, we create a lasting, positive impact for our employees, customers, and the communities we’re part of. You don't have to meet all the requirements listed to apply for this role. If you need any adjustments to make this role work for you, let us know, and we’ll see how we can accommodate them.

We thank all applicants for their interest; however, only the candidates who best meet the job requirements will be contacted for an interview.

By submitting your application online, you agree that your details will be used to progress your application for employment. If your application is successful, your details will be used to administer your personnel record. If your application is unsuccessful, we will retain your details for a period no longer than three years, to consider you for prospective roles within the company.