Plain language is fine
I translate a business or user problem into a technical system without requiring the client to speak engineering jargon.
Founder of Deventra
Roman Nesterov
Software engineer. Complex systems, explained clearly.
I build software products and approach problems at the level of the whole system: application, network, server, device and real operating conditions. I have worked with Android since 2019 and with computers and programming since the early 1990s.
since 2019Android development1990sfirst programsDeventraindependent engineering project
What this means for a client
Problem first. Technology second.
You do not need to arrive with an architecture diagram or a finished specification. It is more useful to explain what needs to work, what already exists and where the problem is today.
I look at the whole system
If a problem lives between the mobile app, API, network and device, it cannot be solved reliably by looking at only one layer.
Existing code is not a problem by itself
Legacy, an unfamiliar project, an unstable integration or a hard-to-reproduce bug is a reason to understand the system first — not to rewrite everything by default.
Engineering path
From ZX Spectrum to modern applications and integrations
The interest in software started long before mobile platforms. The habit that stayed is simple: do not stop at the visible symptom — understand how the system works underneath.
Early 1990s
First computers and programming
Mikrosha, BK, Elektronika, Yamaha and ZX Spectrum. The Spectrum became the point where programming and computer internals turned into a systematic interest.
Early serious experiments
A custom graphics editor
Working with a Kempston Joystick required exploring I/O ports directly, while arbitrary-area fill had to be implemented without a ready-made language function.
Next steps
Languages, web and hardware
Pascal, Delphi, Turbo Basic, some Assembler, JavaScript and PHP, together with practical computer hardware work up to complex laptop motherboard repair.
Since 2019
Android and connected application software
Mobile apps, video surveillance, intercom systems, SIP/VoIP, server APIs, authentication, networking scenarios and device interaction.
Today
Deventra
A project that brings this experience together around custom software development — from a clear user scenario to a complex engineering system.
For technical teams
Technical profile
If a client only needs the outcome, this section can be skipped. For a developer, CTO or engineer, here are the concrete details.
Android
Kotlin, Java, Jetpack Compose, Android SDK, Material 3, lifecycle, background behavior and UI state.
Architecture
Coroutines, Flow, dependency injection, layer boundaries, integration isolation, state management and regression control.
Networking and APIs
REST API, OkHttp, WebSocket, JSON, OAuth 2.0 / OIDC / PKCE, error handling, reconnect and diagnostics.
SIP / VoIP
SIP telephony, Linphone, account registration, incoming calls, audio/video scenarios and real network constraints.
Web and integrations
PHP, HTML, CSS, JavaScript, focused web services, bots, backend integrations and operational interfaces.
Infrastructure
Git, Linux, Windows Server, Apache, Nginx, reverse proxy, SSL, CI/CD and network services.
Deventra
Personal experience inside a broader development capability
Through Deventra you can commission a mobile app, Windows software, web/backend, a website, system software, hardware integration or automation. This page explains where the engineering approach behind the project comes from.
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