Senior Backend Engineer
We are hiring on behalf of our client, a global innovator in fitness and wellness technology. Their mission is to empower people to live fit, strong, long, and happy lives by delivering integrated experiences to millions of members anytime, anywhere.
We are looking for a Senior and Mid Software Engineers to join the Content Cloud team. In this role, you will design and build high-performance backend systems that power content delivery across a global platform. You will act as a technical leader within the team, driving architectural decisions, mentoring engineers, and ensuring the reliability and scalability of systems used by millions of users. This is a hands-on role with strong ownership and impact on distributed, event-driven systems at scale.
Key takeaways:
Stack:
Kotlin (main codebase)
We're open to: Java/Go/TypeScript/JavaScript,
Other tools: REST/gRPC/GraphQL, Kafka, Redis, PostgreSQL/MySQL, DynamoDB/MongoDB, AWS, Docker, Kubernetes
Salary:
Mid: 21 000 PLN - 23 000 PLN gross on the Contract of Employment
Senior: 23 000 PLN - 30 000 PLN gross on the Contract of Employment
Working model: Hybrid - 3 days/week from the office
Location: ul. Grzybowska 60, Warsaw
Recruitment process:
A call with MOTIFE Recruiter
Coding interview
Panel interviews with the team (coding, architecture, and cross-collaboration interviews, Hiring Manager meeting)
Responsibilities:
Backend Architecture & Scalability
Design and build high-performance, scalable backend services and APIs supporting global content delivery
Architect event-driven systems and microservices handling large-scale traffic and real-time interactions
Drive system design decisions with a focus on reliability, performance, and security
Technical Leadership
Lead technical discussions, architecture reviews, and design decisions across teams
Define and promote reusable patterns, components, and engineering standards
Mentor engineers through code reviews, pair programming, and technical guidance
Performance & Reliability
Identify system bottlenecks using monitoring, tracing, and load testing tools
Optimize performance through data modeling, caching strategies, and query improvements
Engineering Excellence
Champion best practices including CI/CD, automated testing, observability, and infrastructure as code
Maintain high standards for code quality, scalability, and maintainability
Continuously improve development processes and system architecture
Cross-Functional Collaboration
Partner closely with Product, Design, and QA to deliver impactful features
Translate business requirements into scalable technical solutions
Act as a domain expert within the team and contribute to platform-wide initiatives
Requirements:
Technical Expertise
6+ years of experience building high-performance, scalable backend systems as Senior/4+ years of experience as a Mid Engineer
Strong proficiency in Kotlin, Python, or similar backend languages
Experience with modern backend frameworks (e.g., Spring Boot or Python-based frameworks)
Strong experience with both relational (PostgreSQL, MySQL) and NoSQL databases (DynamoDB, MongoDB)
Hands-on experience with microservices and event-driven architectures
Experience with distributed streaming platforms such as Kafka
Solid understanding of API design (REST, gRPC, or GraphQL)
Cloud & Infrastructure
Hands-on experience with AWS services (e.g., S3, DynamoDB, Lambda, SQS, IAM)
Experience with Docker and Kubernetes
Familiarity with infrastructure and deployment tooling (e.g., Terraform, GitHub Actions, Jenkins)
Experience with caching systems such as Redis or Memcached
Engineering Practices
Strong understanding of CI/CD, DevOps, and Agile methodologies
Experience with observability and monitoring tools (e.g., Datadog, Sentry)
Proven experience in production support and incident management in distributed systems
What we offer:
100% paid medical care
Multisport
Creative tax (KUP)
Home office allowance
MacBook Pro
Apply now
If this sounds like your next step, we'd love to hear from you! Please apply via our careers page and submit your CV in English.