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🇸🇰 Bratislava, Slovakia · 17h ago

Senior Back End Engineer

Ciklum Czech Republic & Slovakia

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Ciklum is looking for a Senior Back End Engineer to join our team full-time in Slovakia.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 Back End Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. You will drive the development of our core APIs and cloud infrastructure on AWS, with a relentless focus on security, performance, and scalability. Your role will be pivotal in making key architectural decisions, mentoring team members, and establishing best practices to ensure our services are robust, resilient, and capable of handling significant user traffic and data processing.Responsibilities:Take ownership of the technical design for secure, scalable, and high-performance APIs and services on AWS, within a TypeScript-first ecosystemImplement robust security measures across the platform, including authentication, authorization (OAuth 2.0, JWT), data encryption, and vulnerability managementDrive technical decisions and promote best practices in API design, microservices, testing, and deploymentDevelop scalable backend services and clean, reusable frontend componentsOptimize services for maximum speed and low latency, and proactively identify and resolve performance bottlenecksMentor and guide team members, fostering a culture of technical excellence, security consciousness, and continuous improvementOwn and enhance our CI/CD pipelines to ensure efficient, automated, and reliable software deliveryCollaborate closely with Product and Design to translate business requirements into robust and secure technical solutionsRequirements:Essential Qualifications5+ years of professional experience in backend developmentProven experience in designing, building, and maintaining secure, distributed systems on AWS.Strong, hands-on expertise with TypeScript and Node.jsDeep understanding of API security principles and best practices (e.g., OWASP Top 10, rate limiting, input validation)Demonstrable experience with AWS services such as API Gateway, Lambda, ECS, SQS, SNS, and DynamoDBProficient with CI/CD practices and tools (e.g., Jenkins, GitLab CI, GitHub Actions)Hands-on experience with containerization using Docker and an understanding of orchestration (e.g., ECS, Kubernetes)Skilled in working with both NoSQL (e.g., MongoDB, DynamoDB) and relational databases (e.g., PostgreSQL), including performance tuningExperience with monitoring, logging, and observability tools (e.g., CloudWatch, Datadog, Grafana)Strong problem-solving skills and a passion for code quality and technical excellenceUpper-intermediate or higher level of spoken and written EnglishDesirable:Hands-on expertise with React and Next.jsFamiliarity with event-driven architectures and microservicesFamiliarity with Infrastructure as Code (e.g., CloudFormation, Terraform)Working experience with .Net or PythonExperience with GCP and services like BigQueryWhat’s in it for you?Strong community: Work alongside top professionals in a friendly, open-door culture that values initiative and empowers its people to succeedFast-paced & agile environment: Be part of a dynamic, fast-moving organization that champions efficiency and innovationGlobal exposure: Collaborate with international, cross-functional teams and contribute to large-scale initiativesTailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certificationsFlexibility: Balance office and remote work to fit your rhythmCare: Take advantage of our extensive benefits offering, aligned with the best market standardsThe salary starts at 3500 Eur gross. The final salary depends on the previous experience and professional knowledge of the candidate.About UsAt 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.Our Slovakia hub brings together passionate professionals working on global initiatives. Be part of a close-knit team that’s driving digital transformation and creating lasting impact.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.

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