I build systemsto understand systems.
Software, markets, my own mind. The instruments that survive become apps you can use. The infrastructure underneath runs the whole studio.
One person doesn’t ship a portfolio by working harder. I built a system to run the studio.
keltek runs on an operating system I built for it: agents I direct, a memory that compounds what every project teaches, and pipelines from exploration to the App Store. The apps are what the system produces. The system is the real work.
A multi-agent harness that does the work I would otherwise do by hand, held to my standards.
Every project becomes reusable knowledge, so the next one starts ahead instead of from zero.
Pipelines that carry a question I am stuck on all the way to a shipped, finished product.
Most studios are a team. This one is a system.
I build the system first. The product comes later.
Almost everything here started as a tool I wanted for myself, a way to make sense of something I was stuck on. An emulator that only plays the cartridges I own. A paycheck calculator that actually accounts for night shifts. A way to keep three years of messy notes from turning into noise.
I build the system to understand the problem; the ones that turn out useful to other people become apps. I’m wary of organizational theater and of being valued only for being useful, which is why I work alone, and why each of these is a small, finished object rather than a pitch deck.
Build to understand. Ship what turns out useful. Stay small on purpose.
the working principle
Products that fell out of system exploration.
Each began as an instrument I built to understand a system. These are the parts you can download; the systems behind them run the studio.
- 01
HealthSave
↗Export & visualise your Apple Health data. On-device, no account.Health · Shipped
- 02
ShiftWorth
↗Paycheck & shift-pay calculator for nurses and shift workers.Finance · Shipped
- 03
Hearing Helper
↗Turns your iPhone into a mic that lifts nearby speech.Health · Shipped
- 04
Clarity
↗On-device photo cleaner: duplicates, screenshots, big videos.Utilities · In progress
- 05
RetroVault
↗A GBA emulator that only plays files you own.Games · In progress
- 06
Drambook
↗A private cellar book for whiskey collectors.Lifestyle · Shipped
- 07
CatchTime
↗Honest fishing tides & solunar. Light first, moon second.Outdoors · Shipped
- 08
1099 Tax & Mileage
↗Dead-mile tracking for gig drivers, built for an audit.Finance · Shipped
- 09
Darts Scorekeeper
↗Cricket & 501 scoring with checkout help.Games · Shipped
- 10
Honest Decibel
↗A sound-level meter that refuses to overclaim.Utilities · Shipped
- 11
Honest Tan
↗A UV-index sun timer that tells you when to stop.Health · Shipped
- 12
PostReady
↗Record portrait and landscape at the same time.Photo & Video · Shipped
- 13
Quiet Couples
↗A private love tracker for long-distance couples.Lifestyle · In progress
- 14
Color Formula
↗Formula & bowl-cost tool for hair colorists.Productivity · In progress
- 15
ReconstIQ
↗Peptide reconstitution math that shows its work.Health · In progress
- 16
ClaimGuard
↗Find class-action settlements you can actually claim.Finance · In progress
- 17
InkCare
↗Tattoo aftercare, guided day by day.Health · Shipped
The systems, experiments, and research underneath.
Open-source infrastructure, products that live outside the App Store, and the research behind them. Rougher than the shipped apps, and more honest about how the work actually gets made.
- 01
Switchback
↗A single-binary Rust gateway that routes LLM traffic across providers and accounts, with fallback, budgets, encrypted credentials, and explainable metadata-only tracing.Open source
- 02
HealthSave Observatory
↗A self-hosted health-data substrate that unifies Apple Health, Whoop, and Garmin into one private, local record. The engine behind the HealthSave app.Open source
- 03
PazarMap
↗Turkey's street-market finder: 2,777 markets across 63 cities, built on the official registry, searchable by city, district, and day.Live product
- 04
72saat
↗A safety-bounded offline earthquake copilot: LLM guidance kept inside verified safety limits, designed to work when the network is down.Research
- 05
SkillAce
↗AI talent assessment: role-play simulations that score the soft skills a CV cannot show, like empathy and persuasion, for hiring and development.Live product
- 06
LLMs for Game Narrative Design
↗Master's thesis (Bahçeşehir University, 2024): fine-tuning LLMs on structured Assassin's Creed Odyssey quest data to generate game quests. The finding worth keeping is that base models often beat the fine-tuned ones, which says a lot about when fine-tuning actually earns its cost.Master's thesis
Writing on building, systems, and the parts of AI I can’t stop thinking about.
- 01
Landed Is Not Working
I audited twelve subsystems of my own agent stack for signs of life. The dangerous failures were invisible: merged, tests green, dead.
Jul 2026
- 02
I Had 8,000 Conversations With AI. So I Built a Search Engine Over Them.
Three years of ChatGPT history is the densest personal dataset I own. Pointing a retrieval pipeline at it taught me more about memory infrastructure than about myself.
Jun 2026
- 03
Adaptive AI Operating System: Universal Principles for Routing Intelligence
A portable, generic principle set for designing AI systems that treat intelligence as infrastructure.
Jun 2026
- 04
The Fire Problem
On AI, legitimacy, and the thing we were actually avoiding.
Mar 2026
- 05
Beyond Automation: The Age of Recursive Intelligences
We are shifting from designing systems to conducting the agents that design them. Notes on orchestration, cognitive diversity, and a new asymmetry.
Mar 2026
longform · written occasionally, when an idea won’t leave