# Senior Backend Engineer \(Core Team\) - Company: [Playson]() - Location: European Union · Ukraine - Remote: Yes - Team: Platform Tribe - Employment type: Full Time - Posted: April 17, 2025 ## Job description **About the Role** We’re looking for a **Senior Backend Developer** who thrives in a deeply hands-on environment and enjoys being close to the code on a daily basis. This role is heavily focused on building, optimising, and scaling backend services in a high-load system where performance and reliability are critical. You’ll be working on complex, real-time challenges at the core of our platform - improving latency, ensuring high availability, and making systems more efficient at scale. This is not a coordination-heavy role; it’s for someone who enjoys writing production code, solving tough engineering problems, and seeing the direct impact of their work. If you’re product-driven, take ownership, and prefer a “build first, improve fast” approach while working on systems where every millisecond matters - this role will feel like home. **Key Responsibilities** * Work as part of a cross-functional team owning a core product within the platform * Design, build, and deliver new backend features end-to-end in a distributed environment * Write high-quality, production-level code daily, contributing directly to a high-load, scalable system * Take ownership of services handling financial transactions at scale, with a strong focus on reliability and accuracy * Proactively suggest and implement improvements in architecture, processes, and development practices * Participate in code and architectural reviews to maintain high engineering standards * Solve complex business and technical challenges with pragmatic, efficient solutions * Participating in **on-call rotations** within the squad to ensure the reliability and availability of our systems * Play an active role in ongoing tech transformation initiatives across the platform * Collaborate closely with engineers, product, and other stakeholders to deliver impactful solutions used by millions globally **Requirements** * Solid experience with Node.js/TypeScript is ideal, but we also welcome experts in other OOP languages such as Java, Python, C++, C#, or Go * Strong understanding of asynchronous programming techniques * Deep production experience with Kafka: confident reasoning about consumer-group rebalances and their impact on in-flight processing, offset-commit strategies under retries and duplicate delivery, and the limits of "exactly-once" semantics * Experience designing idempotent, retry-safe handlers for at-least-once pipelines: transactional outbox, idempotency keys, and deduplication * Experience building services with gRPC or similar RPC frameworks * Strong knowledge of relational databases such as MySQL or PostgreSQL, plus production experience with at least one NoSQL technology at scale, such as DynamoDB, MongoDB, or Redis * Hands-on experience running services on Kubernetes and AWS/GCP: deployment, autoscaling, resource limits, and production debugging * Production operations experience: on-call ownership of a high-load system, including incident response, impact assessment, root-cause analysis, and post-incident improvements **Nice to Have** * Experience with ClickHouse or other columnar/analytical databases * Experience with multi-region / failover architectures: data replication, regional isolation, and graceful degradation * Practical use of AI coding agents such as Cursor or Claude Code as part of daily development: effective prompting, reviewing, and validating AI-generated code * Understanding of application security and industry best practices * Gambling domain experience **What We Offer** * Competitive Salary * Quarterly Bonuses * Unlimited Paid Time Off * Unlimited Paid Sick Leave * Remote & Flexible Working * Private Medical Insurance * Financial Support for Life Events * Professional Development Budget * International Exposure * Regular Company Events *\*Benefits may vary depending on location and contractual agreement* **Recruitment process** 1. HR interview (30-45mins) 2. Interview with a Hiring Manager (45mins) 3. Technical interview with live coding (90mins) 4. Final Interview with C-level (60 mins) *By submitting your application, you acknowledge that your personal data will be processed in accordance with our* [*Privacy Policy*](https://playson.com/privacy)*.* ## Apply [Apply on Playson]() Canonical job page: