01
Web platforms & SaaS
Customer-facing products, dashboards and internal systems. Thoughtful interfaces backed by maintainable APIs and clear data flows.
Software development, in a new rhythm
Based in Ukraine · Working globallySoftware,
expertly orchestrated.
We build web, mobile and AI-powered products. Hands-on engineering sets the direction. AI helps us move. The result is software built to work in the real world.
Led by 20+ years of hands-on engineering experience.
01End-to-end product development
02AI-augmented. Human-led.
03Architecture through to production
01 /What we build
Your product.
Every layer.
From a new product to a complex existing platform. We connect the interface, the logic and the infrastructure—and take the work through to delivery.
02
Mobile & desktop products
Connected experiences across iOS, Android, macOS, Windows and Linux. Shared foundations without ignoring what makes each platform different.
03
AI-powered applications
Useful AI inside real software: assistants, content workflows, catalog optimization and automation, connected to your product and data.
04
Backends & modernization
Cloud services, integrations and existing systems made easier to operate and evolve. Performance, security and developer tooling are part of the work.
Starting fresh, taking over a codebase, or building the next release?
Tell us what you’re building02 /The thinking behind KEYTAKT
More than code generation.
Engineering direction.
AI accelerates the work. Engineering owns the result.
A conductor doesn’t play every instrument. They make the whole work.
That is how we approach modern development: orchestrating engineering judgment, AI coding agents and verification around a clear product goal. Not more generated code. A coherent, working product.
Set the direction
Start with the product problem, constraints and definition of done. Choose an architecture that serves the goal—not the trend.
Orchestrate the work
Break the work into clear tasks. Use AI agents for exploration, implementation, refactoring and tests where they genuinely help.
Verify the result
Review architecture and code. Test behavior, security and performance. Keep people accountable for technical decisions.
Ship & evolve
Deliver with repeatable tooling and a maintainable codebase. Learn from real use and keep the product moving forward.
Our name brings together two ideas that shape how we build.
KEYClarity. The right technical direction.
TAKTRhythm. Coordinated execution.
03 /Selected engineering experience
Real products.
Real engineering depth.
The experience behind KEYTAKT. Selected work by Olexandr Klyuchka, including roles before the company was established.
CROSS-PLATFORM / REAL-TIME
−50%desktop background
memory usage
memory usage
Real-time collaboration
A real-time collaboration platform across desktop, web and mobile. End-to-end ownership spanning product features, video integrations, cloud infrastructure and release engineering.
Explore the contribution
Cut desktop background memory usage in half and improved API response performance by 3× through a migration of cold-start workloads to Kubernetes on Google Cloud.
Hands-on work across React, React Native and Electron, including IPC, release hardening, production debugging and Playwright end-to-end tests.
AI-NATIVE / COMMERCE
AI,
built in.
AI-powered commerce
Engineering for an AI-native product catalog optimization platform. Connected workflows across product UX, backend services, APIs and Google Cloud.
Explore the contribution
Product workflows across Next.js, React, NestJS and Go. Service boundaries and data flows designed around an AI-native catalog optimization product.
Secure data handling with Cloud KMS envelope encryption, local-development CLI tooling and automated deployment setup for new microservices.
MOBILE / ARCHITECTURE
One shared
foundation.
Mobile modernization
Technical direction for the move from separate native iOS and Android apps to Expo and React Native, guiding the engineers responsible for implementation.
Explore the contribution
Led architecture and technical direction for the migration, consulting and guiding the engineers who carried out most of the implementation.
Also designed declarative React Native configuration tooling to help JavaScript engineers integrate native iOS and Android capabilities without manually editing native projects.
Selected examples of Olexandr’s professional experience, described without client or product names. Results relate to specific past work, not guarantees for other projects.
04 /An engineer at the helm
Olexandr
Klyuchka
CEO & CTO / KEYTAKT
A hands-on full-stack engineer and technical leader with more than 20 years across web, mobile, desktop, backend and cloud systems. Olexandr combines product development, architecture and team leadership with a pragmatic, AI-augmented approach.
20+years of engineering
experience
experience
Up to 30people in teams
previously led
previously led
M.Sc.Artificial Intelligence
NURE, 2008
NURE, 2008
05 /Let’s build something that works
Bring the idea.
Let’s build
the product.
A new product, an existing platform, or a technical challenge worth solving. Let’s start with what you need to build.
Write to us directly about your product or technical challenge. You’ll speak with Olexandr, our CEO & CTO—not an automated sales funnel.
Do you only build AI products?
No. We develop web, mobile, desktop and backend software. AI can be part of the product or part of our development workflow; it is not a requirement.
Can you work with an existing codebase?
Yes. We can assess an existing system, plan the next step and work on new features, modernization, integrations or reliability improvements.
What stays under human control?
Product understanding, architecture, technical decisions, code review and release readiness. AI assists the work; engineering judgment remains responsible for the result.