Full Stack Developer

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About

Here is a little background

Full-Stack Developer with 7+ years of hands-on experience specializing in modern frontend frameworks (React, Next.js) and scalable backend systems (Node.js, Golang). Proven track record in building MVPs, internal tools, and enterprise applications from the ground up. Strong collaborator who has worked in diverse environments — from early-stage startups to large teams — delivering robust features, optimizing performance, and aligning development with business goals. Recently focused on AI-powered SaaS prototypes and LLM orchestration.

Experience

Senior Frontend Lead

THREE SIGMA (Felix Protocol)

Dec 2024 -Present

Contributed as the frontend owner for FelixProtocol, a Web3 lending app that reached $9M in collateral and $2.5M in loans within its first month.
Built the entire frontend from scratch using Next.js, transforming Figma designs into a modular, responsive, and high-performance application.
Integrated advanced Web3 functionality using Wagmi, Viem, and ethers.js, enabling secure wallet connections and smart contract interactions within a React/Next.js environment.
Used Supabase to implement real-time user data flows and secure session management, improving dashboard responsiveness and developer velocity.
Developed GitHub Actions-based CI/CD pipelines including automated testing and linting with pre-commit hooks (ESLint + Prettier).
Contributed to frontend architecture, mentored new hires, and participated in roadmap and product discussions with cross-functional teams.

Full Stack React Developer

Levenue B.V

Jan 2021 -Dec 2024

Translated designs & wireframes into high-quality code by almost 95% and wrote application interface code via Typescript following React.js workflows
Determined application endpoints in Next JS and structured them with helper functions to automate the data by 90% flow from the back end to the front end.
Query the PostgreSQL database to speed up ongoing processes by 25% using efficient algorithms and indexes.
Troubleshoot interface software and debugged application codes to improve functionality and performance by 50%
Test front-end and back-end architectures for code quality sustainability using 100% Jest framework.
Optimized components for maximum performance across a top 10 of web-capable devices and browsers
Created types and interfaces for both front-end and back-end code to ensure readability, scalability, and maintainability.
Crafted an importer tool synchronized with the database system in order to facilitate the analysis of the data team reducing the company's annual technical budget by 15%.
Composed an admin dashboard for the internal team of 15 people to conduct important tasks on the application which reduced the demand of 3rd party CRM tool integrations and boosted performance.

Full Stack Developer

Conversation24

Jan 2020 -Nov 2021

Edited the necessary improvements in the chatbot and implemented new designs for the user experience that increased usage by 30%.
Decreased the WebSocket response time by 20% between the XMPP server to the client by customizing its ready-to-use code.
Determined the structure and design of app internal pages based on user requirements and balanced functional & aesthetic designs
Employed a variety of languages such as Angular, and SASS to write & create user-friendly web pages increased ROI by 40%
Prepared report dashboard for admin users which brought the extra perspective of overall analytics and further led to decreasing report creation budget by 40%.
Enhanced the MongoDB query structure to solve incremental data processing in case of millions of records which prevented the app from crashing unexpectedly.

Web Developer

Saran Group

May 2018 -Jan 2021

Emerged a custom plugin for accessing encrypted data on Google Drive and further turned it into a carousel as live events of 100 records.
Gathered various live sports data from external REST APIs of 15 to create a modern, responsive tablespace to display.
Optimized Amazon EC2 instances to decrease the cost of usage by 45%
Applied object caching by 90% with CDN to further speed up the website.
Enhanced on-site SEO metrics to work closely with the performance agencies that contributed digital reach %50.
Customized pre-built React components on WordPress CMS to get a speed increase of 30%

Skills

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Projects

Case Study 1 of 8: AI Receipt Tracker

SaaS-style invoice processing app with AI-powered parsing, built using Next.js 15, Clerk, Convex, Tailwind, Stripe and SchematicHQ.

Case Study 2 of 8: AI Agent Dashboard

LangChain-powered assistant dashboard with streaming Claude 3.5 responses, prompt caching, real-time feedback, and advanced orchestration.

Case Study 3 of 8: Amazon Clone

Amazon clone has been built by React

Case Study 4 of 8: Twitter Clone

Twitter clone has been built by React and hosted at Firebase.

Case Study 5 of 8: Covid-19 Tracker

Covid 19 Tracker was built with React and hosted on Netflify.

Case Study 6 of 8: Spotify Clone

Spotify clone was built with React and hosted on Netlify. PS: You may need to log in with this app with your Spotify account.

Case Study 7 of 8: Conversation 24

Conversation 24 is an online chatbot designed with Symfony, Angular, and MongoDB and hosted on AWS. I worked with the full-stack team to solve bugs and enhance the system.

Case Study 8 of 8: Levenue App

This investment marketplace company web app was designed by NextJS, Typescript and hosted on Vercel

Contact

I have got just what you need. Lets Talk.

+90 444 23 444

oktarkara@gmail.com

İstanbul / Turkey