Savas Tutumlu founded Stratagem Systems in Houston, Texas, in 2023 and now works from Istanbul. He leads each project himself, from the first call to the handover, so the person on your first call is the person responsible for your software.
Türkiye has been on UTC+3 all year since September 2016, with no daylight saving time. The gap to your office changes only when your own clocks do.
With offices in Europe, most of the working day is shared. With the US and Canada, calls go in your morning, which is afternoon or evening in Istanbul, and the work moves forward while you sleep.
Summer and winter in the table mean your own clocks. The last column counts the office hours both sides share when each works 9:00 to 18:00 local time.
| Your office | Istanbul is ahead by | Shared office hours |
|---|---|---|
| UK time (GMT/BST) | 2 hours in summer, 3 in winter | 7 hours in summer, 6 in winter |
| Central European time (CET/CEST) | 1 hour in summer, 2 in winter | 8 hours in summer, 7 in winter |
| US and Canada Eastern time (ET) | 7 hours in summer, 8 in winter | 2 hours in summer, 1 in winter |
| US Pacific time (PT) | 10 hours in summer, 11 in winter | None |
You sign with Stratagem Systems LLC, a Texas company, and pay one fixed price for a written scope.
Stratagem Systems LLC, founded in Houston, Texas, in 2023. Its terms of service follow Texas law, with disputes heard in the courts of Harris County, Texas. Each project's own agreement sets the scope, the payment schedule and who owns what.
After a free 15-minute call you get a written proposal with the scope, milestones, acceptance criteria and one fixed price, in US dollars unless the proposal says otherwise. More on pricing.
30% to start, 40% at the midpoint and 30% on completion. Support after launch is optional and month to month.
If your software will handle personal data, two sets of rules matter. This is background for planning, not legal advice and not a compliance claim; which safeguard fits your project is a question for your legal adviser.
Projects run in English or Turkish, and the software can ship in several languages.
Code, database and hosting end up in your own accounts, with documentation.
Under the terms of service, the custom code written for your project is yours once it is paid in full. Stratagem Systems' own tools and any third-party libraries stay under their own terms.
After the ERP was designed, built and maintained from May 2025 to August 2026, its code, database and hosting moved to the client's own GitHub, Supabase and Vercel accounts with no downtime.
Each project below has a case study, a store listing or a live site.
A 16-module ERP for an Istanbul manufacturer of thermal-insulation dowels, connected to its LOGO ERP. In production, and handed over in September 2026.
For a private middle school in Istanbul: an AI homework platform in use since May 2026 (Ev Çalışması Merkezi, now offered to other schools as Dijital Yanlış Defteri), an answer-sheet reader, Otocropper for question books and, since August 2026, a timetable system.
MUST, 1in46, Mawla and Zoomi Kids, published under Savas Tutumlu's own developer account. 1in46 is also on Google Play.
Live since July 2026: participation-finance ratios for Borsa İstanbul companies, recomputed from each company's own statements, with the source document behind every number.
Live since 12 October 2026: product manuals turned into animated setup videos, social clips and QR video manuals in more than 20 languages.
Business websites built and deployed end to end, among them the site of Tinyhouse Atelier, whose steel-framed tiny houses are exported to the UK and EU.
Stratagem Systems was founded in Houston in 2023, and you sign with the Texas LLC, in US dollars. Istanbul is 7 to 11 hours ahead of the Eastern to Pacific time zones, so calls go in your morning and the build moves forward while you sleep.
If you are comparing an overseas developer with a local one, see the offshore vs onshore software development guide.
Kickoffs, reviews and milestone meetings happen on video, early in your day, when it is afternoon or evening in Istanbul.
A working build to click through each week, so feedback arrives while changes are still cheap.
Call (786) 788-1030 or email info@stratagem-systems.com. Every message goes to Savas, who replies within one business day.
Stratagem Systems LLC, the company Savas Tutumlu founded in Houston, Texas, in 2023. Its terms of service follow Texas law, and each project's written agreement sets the scope, the payments and who owns what.
Türkiye is on UTC+3 all year. With offices in Europe most of the working day is shared; with the US and Canada, calls go in your morning and you get a working build to try each week.
You do, once the project is paid in full, as the terms of service set out. At handover the code, database and hosting can move to your own accounts, as the SPSTARPLAST ERP's did in September 2026.
A fixed price. After a free 15-minute call you get a written proposal with the scope, milestones, acceptance criteria and one price, paid 30% at the start, 40% at the midpoint and 30% on completion. The fixed-bid vs time and materials guide compares the models.
You talk to the person who builds your software. Read Savas Tutumlu's profile or how the studio started.
A free 15-minute call is enough to know whether it is a fit. If it is, you get a written scope and a fixed price for the first version.
Or email info@stratagem-systems.com, call +90 533 644 73 73 in Türkiye (also on WhatsApp) or (786) 788-1030 in the US.