Senior Backend Engineer (Core Team)
Playson · Europe, Ukraine
What this role requires
10 requirements, read out of the advert rather than guessed from the job title:
Also mentioned, not required: C#, Python, MongoDB, Redis, DynamoDB. Worth having, but their absence is not what gets a CV filtered out.
See how often each of these is required across open backend roles in Europe.
Free, no card. Tells you which of them your CV evidences and which it only implies.
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
Read the full description (42 more sections)Show less
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 .
You will apply. Then you will hear nothing.
And no one will tell you what was wrong. See it before you send: your ATS score, every weak line, and the fix for each.
- 1
Drop in your CV
One PDF, thirty seconds. No card.
- 2
See what is wrong with it
Every weak passage, quoted from your own CV, with the line to replace it.
- 3
Apply where you fit
Every European role ranked against what your CV actually says.
- Free, no card
- Your CV file is deleted after parsing
- Or skip the upload — build your profile by hand
- Refreshed every 6 hours