Senior Backend Developer

<h4>🚀 Senior Backend Developer</h4><p><strong>Location: </strong>Kraków, Poland</p><p><strong>Experience:</strong> 5+ years</p><p><strong>Contract:</strong> B2B, Full-Time<br><br><strong>Join the Future of Digital Tech with Kolomolo</strong></p><p>At <strong>Kolomolo</strong>, we don’t just follow trends - we set them. As a global supplier of IT services and digital modernization solutions, we help businesses embrace cutting-edge technology to optimize their operations. Now, we are growing and looking for fresh talent to grow with us.</p><p><em>Are you proactive, tech-savvy, and eager to build your career in IT? </em><strong><em>This role could be your perfect fit.</em></strong></p><h4><strong>About the Role</strong></h4><p>We’re looking for a Senior Backend Developer who enjoys building reliable, scalable, and modern cloud-native applications.</p><p>In this role, you’ll be responsible for backend feature development, system modernization, test automation, code refactoring, and production deployments. You’ll work on distributed systems and microservice-based architectures while contributing to the design and development of secure and high-performing backend solutions.</p><p>This role is ideal for someone who combines strong technical expertise with a collaborative mindset and enjoys working in agile, engineering-driven environments.</p><h5>What You’ll Be Doing</h5><ul><li><p><span>Develop microservices based on Typescript &amp; NodeJS for core business components.</span></p></li><li><p><span>Design and develop company’s internal IAM microservice, preparing for a migration on a new solution.</span></p></li><li><p><span>Design and develop cloud native applications based on AWS services like Lambda, API Gateway, DynamoDB and EventBridge.</span></p></li><li><p><span>Creating and running automated tests, particularly integration tests and end-to-end tests for the backend layer.</span></p></li><li><p><span>Work closely with Architects &amp; SRE to follow security &amp; reliability standards while being  actively involved in architectural discussions.</span></p></li><li><p><span>Work with external partners &amp; vendors while developing various integrations.</span></p></li><li><p><span>Collaborate with the team and drive it while ensuring high code quality and standards.</span></p></li><li><p><span>Be actively involved in designing and developing reliable &amp; secure backend features/functions.</span></p></li><li><p><span>Work with continuously delivered (CI/CD), asynchronous and distributed systems</span></p></li></ul><h6>Tech stack</h6><ul><li><p><span><strong>Runtime: </strong>Serverless (Lambda, API Gateway, EventBridge)</span></p></li><li><p><span><strong>Backend:</strong>  NodeJS / Typescript (additional Java or Python)</span></p></li><li><p><span><strong>Persistency:</strong> DynamoDB, S3, SNS, SQS</span></p></li><li><p><span><strong>Architecture:</strong> Microservices</span></p></li><li><p><span><strong>IAM:</strong> oAuth2, OIDC Connect, JWT, OPAL</span></p></li><li><p><span><strong>CI/CD:</strong> GitLab</span></p></li><li><p><span><strong>QA:</strong> Playwright/ Postman/ Jest</span></p></li><li><p><span><strong>Infrastructure: </strong>AWS, Kubernetes, AWS CDK, Terraform</span></p></li></ul><h5>What We Are Looking For</h5><ul><li><p><span>Min. 5 years of experience as a backend/full stack developer, with recent projects in TypeScript &amp; NodeJS and other backend programming language (preferably Java or Python).</span></p></li><li><p><span>Experience in creating and running test automation with holistic approach including system, performance smoke and E2E tests (full testing pyramid) on Jest/Postman/Playwright.</span></p></li><li><p><span>Ability to share your knowledge, experiences, and opinions on the forum via technology demos/brainstorming sessions.</span></p></li><li><p><span>Willingness to grow and learn with a passion for creating new solutions.</span></p></li><li><p><span>Experience in working closely with product and design teams as well as doing pair programming in small, agile, and cross-functional teams.</span></p></li><li><p><span>Ability and openness to work in a team, especially within a culture of mutual respect and continuous feedback.</span></p></li><li><p><span>Being a Team Player, able to help people to grow and guide decision-making processes.</span></p></li><li><p><span>Open minded, communicative and focused on delivering business value .</span></p></li><li><p><span>Fluent verbal and written skills in Polish and English.</span></p></li></ul><h5>Nice to Have</h5><ul><li><p>Familiarity with Customer Identity Access Management systems &amp; solutions (CIAM), ideally with proven record in designing and implementing.</p></li><li><p><span>Experience in Infrastructure as a code especially Terraform/ AWS CDK.</span></p></li><li><p><span>Developing &amp; maintaining team’s monitoring dashboards in Grafana stack (Prometheus, Looki).</span></p></li></ul><p><strong>What is in It for You</strong></p><ul><li><p>Competitive salary and benefits.</p></li><li><p>Career development opportunities in a growing tech company.</p></li><li><p>Continuous learning culture: mentorship, internal training, and certifications.</p></li><li><p>Flexible, agile work environment (remote, hybrid, or on-site in Kraków).</p></li><li><p>Office perks: great coffee, tea, fresh fruit, snacks, and a fun atmosphere.</p></li><li><p>Flat management structure, where your voice matters.</p></li><li><p>Regular team events and a social, supportive work culture.</p></li><li><p>Independent Contractor.</p></li></ul><h5>🌟 <strong>Why Join Kolomolo?</strong></h5><p>At <strong>Kolomolo</strong>, we prioritize innovation, agility, and autonomy. Our teams have the freedom to own their work, share ideas, and make meaningful contributions. Inspired by <strong>Scandinavian values</strong>, we believe in <strong>work-life harmony</strong> and creating an inclusive culture where everyone thrives.</p><p>You will be part of a passionate, skilled, and friendly team that works hard and celebrates together. Here, you can build your career on your own terms, with opportunities to grow, learn, and make a real impact.</p><h5><strong>Our Flat Structure &amp; The Culture of Inclusion</strong></h5><p>At Kolomolo, we break the corporate mold. We offer:</p><ul><li><p><strong>Agile Teams &amp; Autonomy</strong>: No micromanagement. You’ll own your projects and enjoy the freedom to innovate.</p></li><li><p><strong>Work-Life Harmony</strong>: Inspired by Scandinavian values, we prioritize balance and flexibility, where remote work and asynchronous collaboration are in our DNA.</p></li><li><p><strong>Learning &amp; Growth</strong>: Continuous learning is at our core. We reward hard work, value smart ideas, and foster an environment of mutual respect and trust.</p></li><li><p><strong>Inclusive Culture</strong>: We believe in DEI: diversity, equity and inclusion. We are committed to creating an environment where every individual, regardless of background, identity, or experience feels valued, respected, and empowered to thrive.</p></li></ul><p>Join Kolomolo and elevate your career with cutting-edge technology, a supportive team, and a company that truly values your input.</p><p></p><p>Ready for the next step? <strong>Apply now</strong> and start an exciting journey of growth and innovation with us!<br></p>