Senior Backend Engineer (Core Team)

Playson; España; À distance; EUR 70 000 - 100 000; Plein temps

Avantages offerts par ce poste

Competitive Salary

Quarterly Bonuses

Remote & Flexible Working

Private Medical Insurance

Professional Development Budget

International Exposure

Regular Company Events

Résumé du poste

Playson is seeking a Senior Backend Developer to own and optimize core backend services in a high-load platform. You will work closely with product and engineering teams to design, build, and scale scalable backend features while maintaining top reliability and performance.

The role emphasizes hands-on production code, on-call responsibilities, and collaboration across a cross-functional squad to drive architectural improvements and high-quality delivery.

Qualifications

• Solid experience with Node.js/TypeScript and other major OOP languages such as Java, Python, C++, C#, or Go.
• Strong understanding of asynchronous programming techniques.
• Deep production experience with Kafka: consumer-group rebalances, offset-commit strategies, and exactly-once semantics limits.
• Experience designing idempotent, retry-safe handlers for at-least-once pipelines: transactional outbox, idempotency keys, deduplication.
• Experience building services with gRPC or similar RPC frameworks.
• Strong knowledge of relational databases such as MySQL or PostgreSQL, plus production NoSQL experience at scale (DynamoDB, MongoDB, Redis).
• Hands-on experience running services on Kubernetes and AWS/GCP: deployment, autoscaling, resource limits, production debugging.
• Production operations experience: on-call ownership, incident response, root-cause analysis, and post-incident improvements.

Responsabilités

• Own core product backend features within a cross-functional team.
• Design, build, and deliver backend features end-to-end in a distributed environment.
• Write production-level code daily for a high-load, scalable system.
• Own services handling financial transactions at scale with reliability and accuracy.
• Proactively propose and implement architectural, process, and development-improvement enhancements.
• Participate in code and architectural reviews to uphold engineering standards.
• Solve complex business and technical challenges with pragmatic, efficient solutions.
• Participate in on-call rotations to ensure system reliability and availability.
• Contribute to tech transformation initiatives across the platform.
• Collaborate with engineers, product, and stakeholders to deliver impactful solutions used globally.

Connaissances

Node.js

TypeScript

Asynchronous programming

On-call ownership

Production debugging

Code reviews

Outils

Kafka

gRPC

MySQL

PostgreSQL

DynamoDB

MongoDB

Redis

Kubernetes

AWS

GCP

ClickHouse

Description du poste

About the Role

We're looking for a Senior Backend Developer who thrives in a deeply hand-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