Kaan is available for hire
Hire KaanKaan Sentürk
Verified Expert in Engineering
Mobile and Full-stack Developer
Zürich, Switzerland
Toptal member since March 31, 2022
Bio
Kaan is a full-stack developer with 10 years of experience building web and mobile applications. Trained at Apple Switzerland, he has excellent attention to detail. Kaan specializes in the JavaScript ecosystem, focusing on TypeScript, Node.js (NestJS), React (Next.js), and various web, desktop, and mobile frameworks.
Portfolio
mobile Health AG
JavaScript, TypeScript, React, React Native, Expo, NestJS, GCP DevOps, Docker...
Journey - Main
API Integration, React Native, APIs, Mobile, Node.js, TypeScript, Firebase...
Digital Nester Inc.
React Native, Amazon Web Services (AWS), Firebase, TypeScript...
Experience
- React Native - 7 years
- Node.js - 6 years
- MongoDB - 6 years
- React - 6 years
- JavaScript - 6 years
- Docker - 3 years
- TypeScript - 3 years
- Kubernetes - 3 years
Preferred Environment
MacOS, Linux, Slack, Notion, Jira, GitHub, GitLab
The most amazing...
...project I've created is Chatroulette's full platform using React (Next.js), React Native, and NestJS, with 3.2 million monthly active users.
Work Experience
CTO
2025 - PRESENT
mobile Health AG
- Architected and built the entire platform end-to-end, including a NestJS back end, React 19 web portal, and React Native (Expo) mobile application. Migrated a legacy .NET, Angular, and native system to a modern TypeScript stack.
- Owned the full DevOps and infrastructure layer, including CI/CD, containerization, and a Swiss-hosted cloud environment, with automated backups and disaster recovery to support medical-grade availability.
- Drove the platform to EU MDR and ISO 13485 certification, and currently lead the technical workstream toward FDA clearance.
- Served as principal architect and hands-on lead developer of a digital health platform supporting cancer patients through remote symptom tracking and monitoring.
Technologies: JavaScript, TypeScript, React, React Native, Expo, NestJS, GCP DevOps, Docker, Kubernetes, Full-stack Development, Mobile Development
React Native Expert
2025 - 2026
Journey - Main
- Developed React Native mobile clients for iOS and Android.
- Introduced new back-end services for internal growth measurement, tracking, and AB testing.
- Refactored and created new core domain entities and layers to support a highly performant and scalable back-end infrastructure.
Technologies: API Integration, React Native, APIs, Mobile, Node.js, TypeScript, Firebase, Next.js, Fastify, Express.js, RESTFul APIs
React Native Expert
2025 - 2025
Digital Nester Inc.
- Developed iOS and Android applications using React Native with advanced features using NFC functionality and wallets.
- Built a back-end server using Node.js and MongoDB. Deployed several Lambda Functions using Firebase.
- Set up a comprehensive software infrastructure for automated deployments across development, QA, and production environments.
Technologies: React Native, Amazon Web Services (AWS), Firebase, TypeScript, Mobile Development, Android, iOS, Near-field Communication (NFC), Apple Watch, Node.js
React and Node Developer
2024 - 2025
Stage Front Tickets, Inc.
- Created a multi-session browser with Electron and React from scratch.
- Added various common tooling and features for browsers like rendering, session management, history management, navigation, bookmarks, chrome extensions, and much more.
- Created automated workflows to simplify buying tickets on various platforms. Automated workflows, used various mechanisms to query, and injected and adapted existing web platforms.
Technologies: Node.js, TypeScript, JavaScript, Electron, Chrome Extensions
React Native Full-stack Developer
2023 - 2024
Pointblank GmbH
- Developed the mobile client for the Optimism platform using the latest React Native version with push notifications and in-app payment features.
- Built the back end for the Optimism platform using NestJS and MongoDB, using REST Endpoints, WebSockets, and push notifications for communication with the client. Additional features concern authentication, authorization, payments, and email.
- Created an integration and deployment architecture using GitHub Actions and AWS Services like ECS, using Fargate, Load Balancers, and Docker.
Technologies: React Native, Full-stack, Minimum Viable Product (MVP), iOS, Firebase, Advertising Technology (Adtech), Mobile Advertising, Figma, SKAN (SKAdNetwork), NestJS, Android, Mobile Payments, AWS Fargate, Amazon Elastic Container Service (ECS), Docker
Senior Full-stack Developer
2021 - 2024
Chatroulette
- Developed a new web platform with React and TypeScript using WebRTC and WebSocket browser API. Used NextJS and fine-tuned application towards Lighthouse metrics (SEO, performance).
- Created mobile apps for iOS and Android with React Native and TypeScript and successfully pushed apps to the App Store and Google Play.
- Built CI/CD pipelines with GitHub Actions and AWS infrastructure.
- Introduced several microservices for various features and business needs using Node.js, NestJS, Python, Docker, and Kubernetes.
- Participated in recruiting and training junior developers and interns.
Technologies: JavaScript, Webpack, TypeScript, Node.js, React, MongoDB, Docker, Kubernetes, Amazon Web Services (AWS), WebRTC, WebSockets, Redux, React Native, NestJS, Next.js, Front-end, Back-end, Firebase, Vercel, Expo
Full-stack Developer
2020 - 2021
Apple
- Developed internal tooling and applications for autonomous systems in research and development (R&D).
- Contributed to several autonomous agents in research and development (R&D).
- Introduced and maintained several microservices to meet various requirements of data scientists in our department.
Technologies: JavaScript, Python, C++, TypeScript, React, Redux
Full-stack Developer
2019 - 2020
Starmind
- Migrated Starmind's white-label front-end platform from Angular to React (NextJS) using micro-front-end solutions, bit by bit, without interrupting the service for 100,000+ users.
- Developed several microservices with NestJS and MongoDB to support synchronization between multiple clients and services.
- Made various UX improvements, SEO optimizations, and new features in an agile environment as part of Starmind's growth team.
Technologies: Angular, React, Vue, NestJS, Node.js, Scala, Jenkins, Docker, Apache Kafka, Elasticsearch, MongoDB, PostgreSQL
Full-stack Developer
2017 - 2020
ETH Juniors
- Developed the entire FlyerBits platform with the back end and two web and mobile clients using Node.js, React, React Native, and AWS.
- Built the whole stack for the DayApp platform with the back end and mobile apps for iOS and Android using Node.js, React Native, and Google Cloud Platform (GCP).
- Developed the ZAV Job Fair platform with the back end and web app using Node.js and Angular.
- Developed internal tools for ETH Juniors and the Campus Interview platform—their annual job fair—using Node.js and React.
Technologies: Angular, React, Node.js, Python, Docker, Amazon Web Services (AWS), Heroku, MongoDB, Vue, React Native, Swift, Android, Java, Solidity, Smart Contracts, Ethereum, Blockchain, Firebase, Redux
Experience
Adresta
https://www.adresta.ch/enAdresta AG builds software as a service (SaaS) for the luxury goods industry in collaboration with manufacturers, distributors, retailers, and owners. The project included building a decentralized app (dApp) with smart contracts managing digital certification for luxury watches.
Chatroulette
https://chatroulette.com/Chatroulette is a peer-to-peer chat platform connecting users worldwide randomly. Chatroulette introduced various new features to extend the user base like interest groups and advanced content filtering using machine learning.
FlyerBits
FlyerBits is an advertisement and coupon app for local business owners and shopping enthusiasts. Users of the FlyerBits app can walk around the city and collect coupons from registered shops. Watching the ads would earn them "bits" and at the same time make them eligible for ongoing campaigns. These "bits" could then be paid out or used as donations to various charities.
Bulbeni Dating App
https://www.bulbeniapp.com/Bulbeni is a side project I developed in order to help introverted Turkish citizens in Europe find suitable chat partners.
The mobile clients were developed using React Native, and the server infrastructure is built with NestJS on top of the AWS infrastructure.
• iOS: Apps.apple.com/ch/app/bulbeni/id6472727387
• Android: Play.google.com/store/apps/details?id=com.bulbeniapp.android
The mobile clients were developed using React Native, and the server infrastructure is built with NestJS on top of the AWS infrastructure.
• iOS: Apps.apple.com/ch/app/bulbeni/id6472727387
• Android: Play.google.com/store/apps/details?id=com.bulbeniapp.android
Recruiting Platform
Campus Interview is the yearly job fair of ETH Zurich, which is developed with React and Node.js. Candidates and employers are matched together for quick meet-ups during the Campus Interview event.
One of the key features developed here was the automatic creation of documents about contracting and scheduling of events. The matcher algorithm matches fitting candidates with employers and the time scheduling algorithm.
One of the key features developed here was the automatic creation of documents about contracting and scheduling of events. The matcher algorithm matches fitting candidates with employers and the time scheduling algorithm.
SmartApply – CV and Cover Letter generation with AI
http://www.smartapply.chSmartApply is a platform that aims to simplify the application process for job seekers. It consists of a CV and cover letter generator using Puppeteer and a visual editor. Additionally, candidates and vacancies are vectorized for the matching algorithm.
The platform was created with Next.js and NestJS. The PDFs that can be exported are created with Puppeteer.
The platform was created with Next.js and NestJS. The PDFs that can be exported are created with Puppeteer.
Education
2019 - 2021
Master's Degree in Computer Science
ETH Zurich | Swiss Federal Institute of Technology - Zurich, Switzerland
2016 - 2019
Bachelor's Degree in Computer Science
ETH Zurich | Swiss Federal Institute of Technology - Zurich, Switzerland
Skills
Libraries/APIs
Node.js, React, WebRTC, RxJS, Web3.js, Vue, React Navigation, Socket.IO, Puppeteer
Tools
Slack, Notion, Jira, GitHub, GitLab, Webpack, Docker Compose, Figma, AWS Fargate, Amazon Elastic Container Service (ECS), Jenkins, Expo
Languages
JavaScript, TypeScript, Scala, Python, C++, Java, SQL, C, Solidity, Swift
Frameworks
React Native, Redux, NestJS, Angular, Next.js, SKAN (SKAdNetwork), Electron, Fastify, Express.js
Platforms
Firebase, Vercel, Docker, Kubernetes, MacOS, Linux, Amazon Web Services (AWS), Blockchain, Blockchain Platforms, Ethereum, Heroku, Android, iOS, Apache Kafka, Apple Watch, Mobile
Storage
MongoDB, PostgreSQL, Database Structure, Redis, Elasticsearch
Paradigms
Object-oriented Programming (OOP), Functional Programming, Mobile Development
Other
Full-stack Development, Mobile App Development, Mobile Apps, Back-end Development, APIs, PDF, Document Parsing, AI Integration, Large Language Models (LLMs), OpenAI, Payment Gateways, WebSockets, Software Development, Distributed Systems, Machine Learning, Big Data, Cloud Computing, Data Structures, Analysis, Linear Algebra, Formal Methods, Algorithms, Apache Pulsar, Smart Contracts, Front-end, Back-end, Full-stack, Minimum Viable Product (MVP), Advertising Technology (Adtech), Mobile Advertising, Mobile Payments, LangChain, Chrome Extensions, Near-field Communication (NFC), API Integration, RESTFul APIs, GCP DevOps
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