Team lead · Istanbul
Celal Demir
I build software and lead the people who build it. The work has been in finance, blockchain, healthcare, and commerce, at startups and at a holding company. I set up the technical foundation and stay with the problem until it is solved.
Selected work
Live
Experience
Apr 2025 — now
Ahlatcı Holding
Team lead · Ataşehir · On-site
Team lead at the holding company.
Jan 2024 — Apr 2025
Ekonobi
Team lead / senior software developer · Maslak · Hybrid
Team lead on a cryptocurrency brokerage, working in Next.js and React.
Sep 2022 — Mar 2023
Kassa
Senior software engineer · Istanbul · Remote · Freelance
Fintech for balances and transactions, with DGPays and QNB Finansbank. .NET Core on Azure, and React for the admin panels.
Sep 2021 — Sep 2022
Sargetek
Development team lead · Istanbul · Remote
Healthcare software for hospitals and laboratories, in Angular and JavaScript. Joined as a senior frontend developer, then led a team of six, including interns and juniors.
Oct 2020 — Sep 2021
Coinoxs
Senior frontend developer · Nişantaşı and YTU Teknopark · On-site
Blockchain products: a decentralized exchange, a block explorer, anti-money-laundering tooling, and a multisignature wallet. Next.js and React.
Jan 2020 — Mar 2021
Headports
Backend developer · Istanbul · Hybrid · Freelance
A hiring product for testing candidates, issuing certificates, and scoring fit, with suggestions drawn from the candidate list. .NET Core on Azure. The startup raised within two months.
Dec 2019 — Oct 2020
HoneyBox
Full stack developer · Istanbul · Hybrid · Freelance
A wellness product. React Native for the app, Express for the API.
Oct 2017 — Mar 2018
Career and Development Club
Community lead / full stack developer · Bahçeşehir University
Led the computer and software community, and built the club’s mobile app for events, members, and sponsorships.
Mar 2017 — May 2017
Durukan Reklam
Full stack developer · Çorlu and Istanbul · Freelance
A desktop app for booking advertisements, in Java and JavaFX. It stopped double-bookings and added schedules and statistics.
Bahçeşehir University, 2016–2020.