Senior Back End Engineer

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 ecosystem
• Implement robust security measures across the platform, including authentication, authorization (OAuth 2.0, JWT), data encryption, and vulnerability management
• Drive technical decisions and promote best practices in API design, microservices, testing, and deployment
• Develop scalable backend services and clean, reusable frontend components
• Optimize services for maximum speed and low latency, and proactively identify and resolve performance bottlenecks
• Mentor and guide team members, fostering a culture of technical excellence, security consciousness, and continuous improvement
• Own and enhance our CI/CD pipelines to ensure efficient, automated, and reliable software delivery
• Collaborate closely with Product and Design to translate business requirements into robust and secure technical solutions

Requirements:

Essential Qualifications

• 5+ years of professional experience in backend development
• Proven experience in designing, building, and maintaining secure, distributed systems on AWS.
• Strong, hands-on expertise with TypeScript and Node.js
• Deep 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 DynamoDB
• Proficient 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 tuning
• Experience with monitoring, logging, and observability tools (e.g., CloudWatch, Datadog, Grafana)
• Strong problem-solving skills and a passion for code quality and technical excellence
• Upper-intermediate or higher level of spoken and written English

Desirable:

• Hands-on expertise with React and Next.js
• Familiarity with event-driven architectures and microservices
• Familiarity with Infrastructure as Code (e.g., CloudFormation, Terraform)
• Working experience with .Net or Python
• Experience with GCP and services like BigQuery

What’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 succeed
• Fast-paced & agile environment: Be part of a dynamic, fast-moving organization that champions efficiency and innovation
• Global exposure: Collaborate with international, cross-functional teams and contribute to large-scale initiatives
• Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications
• Flexibility: Balance office and remote work to fit your rhythm
• Care: Take advantage of our extensive benefits offering, aligned with the best market standards

The salary starts at 3500 Eur gross. The final salary depends on the previous experience and professional knowledge of the candidate.

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. 

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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