Founder-led studio · Houston, TX · Est. 2023
Custom software, AI systems and iOS apps, built by founder Savas Tutumlu. 30 projects shipped since 2023, from a manufacturer’s ERP to AI homework marking at an Istanbul school, plus four apps on the App Store.
Seven projects with full case studies: the problem, what was built and where it stands today, whether in production at a client, live to the public or in alpha with teachers.
In production
SPSTARPLAST · Manufacturing
Sales, production, inventory, quality, shipping and purchasing in one system for an insulation-anchor manufacturer, integrated with the company’s LOGO ERP. Built by a sole developer and handed over to the client in September 2026.
In use since Sep 2026
Erkan Ulu Schools · Computer vision
An offline Mac app that turns scanned question-bank PDFs into one image per question, named by its printed number and filed by unit and test. On a 238-page book it never saw in training, the detector reached 97.1% recall and 96.9% precision at IoU ≥ 0.9.
Live since May 2026
Erkan Ulu Schools · Education
Students upload photos of handwritten homework. Each question is marked correct, wrong or partly correct against the teacher’s answer key and explained, teachers see the whole class, and a teacher’s override always wins.
Live since Jul 2026
Savas Tutumlu’s own venture · Finance data
Free, source-linked participation-finance ratios for Borsa İstanbul companies, recomputed from each company’s own financial statements. A forecast frozen before the October 2026 index review matched 238 of 241 calls, and each miss is explained on the site.
Teacher-only alpha
Erkan Ulu Schools · Game-based learning
A 3D WebGPU island game for the students’ iPads, running inside the school’s homework platform. Correct homework earns boat fuel, which only the server can write. In production for teachers since 26 September 2026.
Erkan Ulu Schools · AI grading
YOLO finds the answer rows on photos or scans of exam sheets, and a custom-trained open-source vision-language model served with vLLM reads the marked options. Low-confidence sheets go to a teacher, and results land in the school portal.
Dr. Ayberk Akcay · Healthcare marketing
A website, SEO and an engine on the official Google Ads API that generates campaigns, ad groups, keywords and ads from templates and rules, with budget caps, dry runs and change logs. Over $1M a year in ad spend runs through it.
Savas Tutumlu founded Stratagem Systems in Houston, Texas, in 2023 and now works from Istanbul. He holds a B.S. in Computer Science from UC Santa Cruz and is the engineer behind every project on this page.
There are no account managers in between. You agree the scope with Savas, see the work as it ships, and at the end the code, the database and the hosting accounts are handed to you.
Six kinds of work, each with a shipped project behind it.
Systems built around how a company already works, from quotes and production planning to stock and shipping, connected to the software it already runs.
Shipped: SPSTARPLAST’s 16-module ERP
Details on custom softwareLanguage and vision models inside real products, with confidence checks and a person who can overrule the result.
Shipped: AI homework marking for Erkan Ulu Schools
Details on AI developmentDetectors trained on your own documents or images, tested on data they never saw, and shipped in apps that can run offline.
Shipped: Otocropper, 97.1% recall on an unseen book
Details on computer vision and machine learningApps designed, built and published end to end, through App Store review and the updates that follow.
Shipped: MUST, 1in46, Mawla and Zoomi Kids, all live
Details on iOS app developmentTools made with teachers: homework marking, answer-sheet reading, question cropping and a learning game for students’ iPads.
Shipped: Gelgit Adası, where homework fuels the boat
Details on education softwareCampaigns, keywords and ads generated through the official Google Ads API from templates and rules, with budget caps and change logs.
Shipped: over $1M a year in ad spend for Dr. Ayberk Akcay
Details on Google Ads automationAlso: web applications, AI agents, ERP systems, system integration and UI/UX design. All services
Four sectors with shipped projects behind them.
Four systems for Erkan Ulu Schools in Istanbul: homework marking, answer-sheet reading, a question cropper and an island game.
Education softwareSPSTARPLAST’s 16-module ERP, from quotes and production planning to the mold shop, quality checks and shipping.
Manufacturing softwareSağlama recomputes participation-finance ratios for Borsa İstanbul companies from their own financial statements.
Fintech softwareA website, SEO and a Google Ads engine for Dr. Ayberk Akcay’s healthcare practice.
Healthcare softwareAnother sector? Describe the problem and get a straight answer on whether custom software fits.
Get in touch
Work arrives in small releases you can open and test, not in one reveal at the end. Otocropper shipped five versions in its first week with teachers, two of them after teacher reports.
Where a model makes a call, a person can check it. Low-confidence answer sheets go to a teacher for review, and a teacher’s mark always beats the AI’s.
Fixes and new features continue after launch on a month-to-month basis, with no long-term contract to sign.
Five working rules behind the projects above.
Have a project in mind? Start with a 15-minute call.
The price is fixed before work starts and tied to a written scope, so it does not grow with the hours. A change to the scope is priced in writing before it is built.
At handover you get the code, the database and the hosting accounts. SPSTARPLAST’s ERP moved to the client’s own GitHub, Supabase and Vercel accounts with no downtime.
The short version. Every step, from the first meeting to support after launch, is on the process page.
Talk through the problem and what a good result looks like. If an existing product would do the job, you will hear that too.
Deliverables, milestones and acceptance criteria, written down before any code, with the fixed price attached.
Releases you can try as the work progresses. Payment follows the milestones: 30% to start, 40% at the midpoint and 30% on completion.
The code, the database and the hosting accounts are handed over with documentation. Support continues month to month if you want it.
30 projects shipped since 2023
Dated milestones from the case studies, newest first. Each one links to its project.
Not sure what you need?
A 15-minute call is usually enough to tell whether custom software is the right answer.
The tools the case studies above actually use, and where each one runs.
Price data you can check, contract checklists and write-ups from the projects above.
All articles
What a LoRA or QLoRA fine-tune costs: GPU prices, the memory math and a calculator for your own run.
What retrieval-augmented generation costs to build and run, with a calculator for your own numbers.
The clauses to check before you sign, from IP ownership and payment milestones to change requests, and the red flags to refuse.
In short
Stratagem Systems is the software studio of founder Savas Tutumlu, founded in Houston, Texas, in 2023. It builds custom software, AI systems and iOS apps and has shipped 30 projects since 2023.
