Senior Back End Engineer

Ciklum

Remote, Slovakia

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