Senior JavaScript Engineer

Ciklum is looking for a Senior JavaScript 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 JavaScript Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. You will be working for a Data Platform that sets the standard for engineering excellence with a high-performance software solution built on Node.js, React, and TypeScript. It transforms complex product ideation into scalable backend architectures that make RESTful APIs and cloud-native features run faster, work more reliably, and deliver low-latency experiences for the global fintech market. Responsibilities: Take involvement and ownership of all aspects of product development, from ideation through architecture to implementation, testing, and continuous deployment Work closely with developers, product managers, and other stakeholders to ensure smooth integration and timely delivery of features Lead the design and implementation of RESTful APIs to enable seamless integration with various internal and external systems Optimize application performance to ensure low latency, high availability, and reliability Participate in design and code reviews and ensure adherence to coding standards and best practices Conduct thorough testing of backend components, write automated tests, and ensure high code quality and reliability Identify and address bottlenecks, bugs, and performance issues within the backend infrastructure Stay up-to-date with industry trends, emerging technologies, and best practices to continually improve the development process Contribute to the overall technical strategy and archite