Kerem Sevencan's CV

Kerem Sevencan — keremciu.github.io

Tech Lead Software Engineer with 16+ years of experience - TypeScript Enthusiast - High EQ

Building scalable web apps/portals with a focus on Testing and Security.
Creating simple, accessible and consistent Design Systems.
Promoting efficient async communication, collaboration, and documentation.
Experience in Devtools, Fintech, Adtech, Cybersecurity, Insurtech, and IPS domains.

Apr 2024 - Present Zalando, Berlin, DE — Senior Software Engineer

Extended the existing Backend-for-Frontend with multi-tenancy, enabling the company to deploy and manage distinct partner portals across various URLs from a single system.
Restructured the existing micro-frontend infrastructure into a reusable foundation, allowing cross-functional teams to independently build and deploy their own internal portals with minimal maintenance overhead.
Managed a comprehensive redesign for all partner-facing applications. Defined the development roadmap and migration strategy to ensure a smooth delivery under a tight deadline.
Supported an 8-person engineering team by proactively resolving complex architectural blockers, encouraging technical ownership, and building trust through reliable collaboration.

Oct 2022 - Aug 2023 Rapid, Berlin, DE — Tech Lead Software Engineer

Modernized a critical Python monolith by integrating CI/CD pipelines and applying 12-factor app principles, improving overall deployment reliability.
Coordinated large-scale integration efforts across multiple teams, stepping in to take on project management responsibilities and define clear, achievable roadmaps.
Guided the team through complex infrastructure transitions, including an AWS account consolidation and a successful migration from ECS to EKS.
Streamlined collaboration between design and engineering by introducing Design Tokens to automate the handover process.
Built a company-wide micro-frontend template to standardize UI development and help other teams initialize new projects efficiently.
Ensured enterprise-grade quality by implementing robust testing and security measures.

Dec 2021 - Oct 2022 Feather Insurance, Berlin, DE — Senior Software Engineer

Partnered directly with the Head of Engineering to execute a critical security migration from token-based to cookie-based authentication.
Fostered a strong frontend testing culture by organizing internal workshops and presenting practical, hands-on best practices to the team.
Authored foundational technical documentation (ADRs, ERDs, RFCs) to improve architectural alignment and system comprehension across the entire engineering department.
Mentored fellow software engineers and actively contributed to the technical hiring process, helping to build a supportive and capable team.

Sep 2019 - Nov 2021 Cobalt.io, Berlin, DE — Senior Software Engineer

Worked on automation features to reduce manual clicks(90 -> 12) around the pentest management process.
Built a design system with styled-system lib and followed tokens > utils > components pattern.
Introduced contract testing to make sure backend services do not break web apps. It’s a network mock solution built with mock service worker and openapi-backend libs which consumes OpenAPI specs.
Landed e2e infrastructure with Cypress and implemented happy-path tests. (had also playwright)
Improved unit/integration test quality by transitioning from enzyme to react-testing library.
Wrote many documents(ADR/ERD/RFC) to improve code quality/understanding all across engineering.

Jan 2017 - Mar 2019 Adphorus, Berlin, DE — Lead Frontend Developer

Hired 8 people for the front end and helped them increase their knowledge base and productivity.
Made internal presentations to explain the business domain and tech.
Worked with the design team on rebranding to build a visual language that is used by consumer-facing interfaces.
Solved scalability problems(aws lambda) for big hotel/airline feeds to create visual ads automatically.

🌟 Adphorus was acquired by Sojern in November 2017.

May 2016 - Dec 2016 PointrLabs, London, UK — Lead Frontend Developer

Built a server application from scratch to serve .NET REST API to mobile apps and a new dashboard for serving indoor location data. It fixed dynamic object modeling problems between development teams.
Made internal presentation about GraphQL and Redux here to increase adoption.
Built a responsive website with automated deployment orchestration.
Built a small access management tool to help out the marketing team in customer specific demos.

Sep 2014 - Oct 2016 Asseco South Eastern Europe, London, UK — Frontend Developer & Designer

Built iPad and mobile applications with Angular1/React and Cordova.
Helped the product team with different phases like business analysis, wireframing and design.
Made simple interfaces with GulpJS for internal dev tooling.
Acted as a technical supervisor and joined many client meetings as I worked on several web projects.

Apr 2014 - Oct 2014 Online People, London, UK — Frontend Developer & Designer

Built a hybrid web application from scratch. Transitioned a Facebook app into a cross-device app.
Designed all design assets of the application and the company itself.

Oct 2010 - Dec 2012 YCEO, Istanbul, TR — Frontend Developer

Implemented client-specific designs on top of the Django View Layer like custom Shopify themes.
Developed reusable jQuery components like slider, cart and checkout components.

Jan 2010 - Oct 2010 Bilginet Bilisim, Istanbul, TR — Frontend Developer

Implemented Client specific designs on top of basic HTML tables.
Developed reusable Login and Card components by using jQuery and AJAX.
Developed a Facebook app that works as a tab on our client’s facebook pages to show their products.

2011-2016 Maltepe University, Visual Communication Design

2013-2015 Cardiff MET University, Graphic Communication

GitHub	github.com/keremciu	email	ciukerem@gmail.com
linkedin	linkedin.com/in/keremsevencan	twitter	twitter.com/keremciu