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Mehtap Celik

@mehtapcelik

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Senior mobile and web app developer specializing in React Native and TypeScript.

Turkey

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What I'm looking for

React Native, React, Next.js, Nest.js, Node.js, JavaScript, TypeScript

I am a Senior Software Developer with 11+ years of professional experience, specializing in React Native, React.js, Next.js, pure JavaScript, and TypeScript. I focus on building clean, maintainable, high-performance applications with scalable and well-structured architectures.

In addition to my mobile and front-end expertise, I have hands-on back-end development experience with Nest.js, Node.js, PostgreSQL, and Docker. I build robust RESTful APIs and back-end systems, including role-based authentication, scalable database architectures, efficient schema modeling, indexing strategies, and query optimization.

I am currently expanding my expertise in LLMs with a focus on areas such as tokenization, embeddings, transformer architectures, and fine-tuning. Furthermore, I also have practical experience with AI-orchestrated development workflows, where AI agents support planning, implementation, code review, testing, and quality assurance throughout the software development lifecycle.

My up-to-date resume:
https://www.dropbox.com/scl/fi/1b9olofjc7i7lk7mo8nc9/MehtapCelikCV.pdf?rlkey=33ruc7os5zdqb811phrcmfmgu&st=1qo66bbg&dl=0

Experience

Work history, roles, and key accomplishments

Full Stack Developer

Tetra Electronics

Jun 2025 - Jul 2025 (1 month)

Developed a full-stack IoT system for real-time remote control of smart cars, implementing RBAC, optimized PostgreSQL schema, RESTful APIs, WebSocket low-latency commands, and live video streaming integration.

NestJS PostgreSQL Docker React Native TypeScript WebSockets RBAC

Senior Mobile & Web Developer

Mintea

Aug 2024 - Mar 2025 (7 months)

Maintained and enhanced React Native mobile app and therapist/admin web portals, integrated real-time chat/video (Twilio, Pusher), added Arabic RTL support, and improved stability and release processes.

React Native TypeScript Redux Redux Saga Twilio Pusher Firebase Crashlytics RTL React Query

Full Stack Developer

Upwork (Client: e-learning project)

Aug 2024 - Feb 2025 (6 months)

Built an e-learning web platform with role-based authorization, RESTful APIs, Dockerized backend, React frontend with Tailwind, and advanced analytics with PDF export for reports.

NestJS PostgreSQL Docker React TypeScript Tailwind Data Visualization PDF Export

Senior Frontend Developer

Hologram Sciences

Apr 2023 - Mar 2024 (11 months)

Developed a responsive e-commerce site and reusable JS component library, implemented mobile-first React interfaces, unit and E2E tests, and integrated Sentry for monitoring to improve stability.

React Vite TypeScript Jest Sentry Component Libraries E2E

Senior Mobile Developer

Hologram Sciences

Apr 2022 - Apr 2023 (1 year)

Built a menopause support mobile app with custom charts, implemented GraphQL for efficient data fetching, and delivered unit/E2E tests to ensure app stability and usability.

React Native TypeScript GraphQL Redux Saga React Native Svg Jest E2E

Frontend Web Developer

Kafein Technology Solutions

Jan 2020 - Apr 2022 (2 years 3 months)

Developed an Angular-based warehouse back-office app with barcode scanning, implementing RxJS for reactive flows and NgRX for scalable state management.

Angular TypeScript RxJS NgRX Bootstrap Angular Material Jest

Mobile Application Developer

Turkcell (via Kafein Technology Solutions)

Jun 2019 - Jan 2020 (7 months)

Developed the Ultia mobile app enabling customizable company modules, implemented dynamic forms, native fast-login SDKs, animations, multi-language support, and integrated Crashlytics and FCM.

React Native TypeScript Redux React Hooks Firebase Crashlytics

Mobile Application Developer

Freelance

Jan 2019 - Jun 2019 (5 months)

Built multiple consumer apps including social media, bike rental, and brand-customized apps with features like social logins, video conferencing, push notifications, and multi-brand theming.

Social login React Native Agora Firebase Multi Platform Deployment

Mobile Application Developer

Ooautos

Jan 2019 - Jun 2019 (5 months)

Developed a car wash mobile app with QR code scanning and map integration to locate stations and automate credit deduction for users.

React Native Maps Git Jira Firebase

Project Manager

Digital DNA

Nov 2017 - Sep 2018 (10 months)

Coordinated projects and events, managed developer tasks using Jira and Jirio, and improved departmental efficiency through performance tracking and reporting.

Project Management Jira Jirio Project Tracking Team Coordination Reporting Slack

Software Tester

Digital DNA

Sep 2016 - Oct 2017 (1 year 1 month)

Conducted systematic testing of mobile and web apps to identify bugs and performance issues, reported findings, and tracked resolutions via Jira to ensure timely fixes.

Software Testing QA Jira Bug Reporting Mobile Testing Web Testing Test Planning