Back End JavaScript Developer

Ciklum is looking for a Back End JavaScript Developer 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 Back End JavaScript Developer, become a part of a cross-functional development team engineering experiences of tomorrow.

You will join a cross-functional squad that takes ownership of its product area, collaborating closely with senior engineers while contributing your own voice to technical discussions and implementation choices.

This specific project enhances trust and transparency by detecting and preventing fraudulent activities, such as fake reviews, and ensuring policy compliance through AI, data analysis, and scalable fraud detection systems. Your work will directly influence the integrity of the platform for over 64 million monthly users!

Responsibilities:

• Collaborative Development: Work alongside Product, Design, Data Science, and senior backend engineers in a cross-functional squad that owns its product and codebase end-to-end
• System Implementation & Design: Partner with senior engineers to design backend services, and independently implement high-volume, scalable data processing solutions for fraud detection using TypeScript
• Growing Autonomy: Take on complex backend tasks alongside senior developers, transitioning over time into delivering end-to-end features and services with minimal day-to-day supervision
• Scale & Reliability: Build and maintain secure, distributed cloud services within an event-driven microservices architecture, focusing on code quality, testing, stability, and performance
• Lifecycle Ownership: Participate across the development lifecycle-from technical grooming and architecture discussions to deployment, monitoring, and production maintenance
• Continuous Improvement: Actively participate in constructive code reviews, incorporating architectural feedback from senior colleagues to elevate code health and engineering best practices

Requirements:

• Experience: 5+ years of professional software development experience, with a solid focus on backend engineering
• Core Tech: Strong, hands-on expertise with JavaScript, TypeScript, and Node.js
• Cloud Infrastructure: Solid, hands-on experience with AWS services-including API Gateway, Lambda, ECS, SQS, SNS, and DynamoDB-utilizing Infrastructure as Code (Terraform or CloudFormation)
• Architecture: Practical experience building and maintaining event-driven and microservice architectures, preferably using the Serverless Framework
• Databases: Solid proficiency with NoSQL (DynamoDB) and relational databases (PostgreSQL)
• DevOps & Tooling: Working experience with modern CI/CD pipelines (such as GitHub Actions), Docker, and container orchestration platforms (ECS or Kubernetes)
• AI-Assisted Development: Hands-on experience developing with AI-assisted engineering tools to accelerate workflows and code delivery, with a strong preference for Claude Code
• Independence & Ownership: A proven track record of taking user stories and technical specs from inception to production release, proactively resolving blockers, and working with increasing self-direction
• Collaboration & Coachability: An eagerness to learn from and pair with senior team members, absorb architectural guidelines, and ask the right questions when tackling ambiguous technical challenges

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.