Senior Full Stack Engineer
Ciklum is looking for a Senior Full Stack Engineer to join our team full-time in the Czech Republic.
We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.
About the role:
As a Senior Full Stack Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. You'll be part of a small, close-knit R&D team that builds features across the whole stack. How much time you spend on frontend versus backend depends on what the feature needs. One week it might be 70/30, the next 60/40, and sometimes you'll take a feature from start to finish. The platform is mature and busy, with peaks of over 20,000 messages per second. The team is AI-first, so tools like Claude Code and GitHub Copilot are simply part of how we develop every day. You will join a long-term engagement with an Israeli company in automotive cybersecurity. Its platform protects millions of connected vehicles and covers vehicle security monitoring, threat detection, and fleet security operations, as well as API security.
Responsibilities:
Build and maintain reliable React/TypeScript frontend components, applying consistent standards for code quality, testing, and reusability
Implement features end-to-end: React UI through backend services; take ownership from architecture to production
Design and optimize PostgreSQL schemas; understand query performance and indexing
Work with Kafka for event-driven workflows; process and stream thousands of messages per second
Develop backend services in Kotlin; contribute to backend design and architecture
Implement and optimize data queries in data lake (Iceberg/Trino)
Integrate GraphQL for client-server communication; understand schema design and performance
Write tests across the stack; maintain code quality and reliability standards
Debug production issues; profile and optimize performance bottlenecks
Collaborate with frontend engineers and backend architects on design and implementation
Participate in code reviews; maintain team standards on both frontend and backend
Use AI tools such as Claude Code as a natural part of your workflow
Requirements:
5+ years of production software development experience
Expert-level React and TypeScript; deep understanding of component architecture and state management
Strong algorithmic thinking and system design skills; can review and critique code thoughtfully
Strong backend experience: Java, Kotlin, or Node.js; but comfortable switching to Kotlin codebase
PostgreSQL experience; understanding of schema design and query optimization
Experience with high-scale, resource-constrained systems (20,000+ messages/second processing)
GraphQL or REST API integration; understanding of client-server contracts
Git and CI/CD pipelines; familiar with GitHub workflows
Fast learner, independent and a strong team player
Proficient in verbal and written English communication
Nice to have:
Kafka or event-driven architecture experience
Data lake concepts (Iceberg, Trino)
Docker, Kubernetes (practical understanding)
Multi-cloud experience (AWS, GCP, Azure)
Mentoring or technical leadership experience
Automotive or cybersecurity domain background
What’s in it for you?
Flexible working hours
Home office option
5 weeks of holiday
5 sick days
Multisport Card
Meal allowance
Internal trainings including workshops and seminars
Paid certifications and technical as well as soft-skills training
Possibility to participate in international conferences
Fresh fruit, coffee, and a weekly company breakfast in the office
Loyalty bonus after 5, 10, 15 and more years with the company
Referral bonus programme
Corporate events including team building, outdoor activities, Christmas party, health week, summer ice cream, and more
Hybrid and remote working options available across our Czech offices in Prague, Hradec Králové, and Zlín
About us:
At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.
With delivery centers in Prague, Hradec Králové, and Zlín, our Czech team delivers end-to-end solutions across industries. Here, innovation thrives through collaboration, and every idea drives our partners' success.
Explore, empower, engineer with Ciklum!
Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.