Skip to content
View CemAyyildiz's full-sized avatar
10 followers · 15 following

Achievements

Achievement: Pull Sharkx2Achievement: QuickdrawAchievement: Pair Extraordinairex3Achievement: YOLO

Achievements

Achievement: Pull Sharkx2Achievement: QuickdrawAchievement: Pair Extraordinairex3Achievement: YOLO

Highlights

  • Pro

Block or report CemAyyildiz

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

You must be logged in to block users.

Content in all repositories owned by your account will be closed.
Maximum 250 characters. Please don’t include any personal information such as legal names or email addresses. Markdown is supported. This note will only be visible to you.
Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse
CemAyyildiz/README.md

Cem Ayyıldız

Software Developer · Java / Spring Boot · Web3 & backend · Computer Engineering @ MCÜ

Portfolio LinkedIn X Email

İzmir, Türkiye · Open to internships and junior software roles

I ship products that people can actually use: backends, wallets, payments, and smart contracts.

At OverBlock I went from intern to software developer. I have worked on a live Web3 product with 40K+ users, published an npm package, launched a Sui mainnet app, and built invoice/payment flows on Stellar. CrossQuery is my Java 21 / Spring Boot work: a multi-model ideation panel with tests and CI.

const cem = {
  role: "Software Developer",
  company: "OverBlock",
  study: "B.Sc. Computer Engineering · MCÜ",
  ships: ["Java", "Spring Boot", "TypeScript", "PostgreSQL"],
  chains: ["Stellar", "Sui / Move", "EVM / Solidity"],
  proof: ["40K+ users", "npm: mantle-402", "Sui mainnet", "CrossQuery"],
};

Featured work

Project What I built Stack
CrossQuery Multi-model ideation panel: research, cross-examine, vote, scored Top-3. Tests + CI. Java 21 · Spring Boot · JPA · Flyway
Quittance Invoice → pay on Stellar → verify on Horizon → download payment proof TypeScript · Next.js · Stellar
mantle-402 HTTP 402 payment flow on Mantle, published as an npm package TypeScript · EVM
Somiverse Smart contracts + production fixes on a live platform with 40K+ users; PWA for mobile Web3 · React · PWA
Mapmark Location bookmarking on Sui, shipped to mainnet (mapmark.fun) Move · TypeScript · React
order-system Real-time restaurant order tracking, end-to-end TypeScript · PostgreSQL
More

Stack

Java / backend: Java 21 · Spring Boot · JPA · Flyway · REST · PostgreSQL · Docker
Also ships: TypeScript · Node.js · React · Next.js
On-chain: Solidity · Move · Stellar / Horizon · Freighter · EVM

Now

  • Software Developer @ OverBlock (İzmir)
  • B.Sc. Computer Engineering @ Manisa Celal Bayar University
  • Dept. Student Representative
  • Building payment, identity, and agent tooling across Stellar / Sui / EVM

Pinned Loading

  1. Quittance Quittance Public

    Invoice on Stellar. Get paid. Keep the proof.

    TypeScript 2 79

  2. ParallelProgramming ParallelProgramming Public

    Forked from canbula/ParallelProgramming

    Repository for Parallel Programming course given by Assoc. Prof. Dr. Bora Canbula at Computer Engineering Department of Manisa Celal Bayar University.

    Python

  3. order-system order-system Public

    Real-time restaurant order tracking. TypeScript, Node.js, PostgreSQL.

    TypeScript 1

  4. WriteBlock WriteBlock Public

    Decentralized content platform on Sui with on-chain data structures.

    Move 1 1

  5. argus argus Public

    Real-time token security analysis for AI agents

    JavaScript

  6. dreamdex-trade-bot dreamdex-trade-bot Public

    Python