KV Xj develop

IT / Mobile / Backend / IoT

I turn messy technical ideas into working products

Kostiantyn Volkov - practical engineer for apps, automation and connected systems

I help companies and founders build the thing they actually need: an iOS app, a backend, an admin panel, an AI workflow, an IoT dashboard, or a small production system that simply works.

2y+ commercial delivery
3-4y Swift / SwiftUI
Full loop idea -> release -> support

Who it is for

Clear help for different people

I explain technical decisions in plain language, keep the scope visible, and show progress with working demos instead of long abstract reports.

For HR and IT teams

A developer who can join product work, understand tasks quickly, communicate clearly and ship iOS/backend features without drama.

For business owners

You do not need to know the stack. Tell me what should happen in the business, and I translate it into a practical technical plan.

For hardware and IoT ideas

Sensors, ESP32/Raspberry Pi, dashboards, alerts, device data, local network tools and mobile control interfaces.

What I can build

One engineer for the parts that usually get split between three people

Not “I know many technologies”, but “I can connect the pieces into one usable system”.

01

Mobile apps

iOS apps, SwiftUI/UIKit interfaces, subscriptions, push notifications, offline mode, analytics and App Store release.

02

Backend and APIs

FastAPI services, PostgreSQL, Redis, auth, admin panels, payments, background jobs and stable Docker deployments.

03

IoT and local devices

ESP32, USB/serial devices, cameras, local servers, dashboards, device monitoring, alerts and integrations with real hardware.

04

AI and automation

OpenAI/Gemini workflows, OCR, voice, content pipelines, Telegram bots, CRM helpers and small automations that save manual work.

05

Fixing and improving systems

Performance, bugs, server setup, Docker, Nginx, monitoring, migrations, admin tooling and support after launch.

06

Technical planning

Architecture, task breakdown, feasibility checks, estimates and plain-language explanations before development starts.

How we work

No mystery, just visible progress

1

We define the result

What should the user or business be able to do when the work is finished?

2

I choose the simplest safe solution

No overengineering. I explain the stack, risks and timeline in normal words.

3

You see working demos

Small releases, clear feedback, real testing, deployment and support.

Experience

Commercial work and product delivery

Sep 2025 - Present

iOS Developer

Midnight.Works / Remote

Production SwiftUI work under NDA: modular architecture, navigation flows, API integration, caching, pagination and analytics.

Jan 2024 - Sep 2025

Middle-Senior iOS / Full-Stack Developer

Polorix / Remote

End-to-end product work across iOS, backend, AI/content pipelines, recommendations, translations, admin notifications and deployment.

Feb 2022 - Sep 2024

Freelance iOS Developer

Self-employed / Remote

Apps with onboarding, auth, subscriptions, push notifications, offline caching, widgets, reports and App Store releases.

Proof of work

Examples of systems I have built or supported

The useful pattern: mobile UI, backend logic, data, automation and deployment working together.

Klad

Save, organize and plan

SwiftUI app with offline cache, REST APIs, RevenueCat, analytics, APNS, recommendations, reviews, collections, quotas and admin tooling.

Polorix Platform

Content and metadata backend

FastAPI pipeline for ingestion, AI enrichment, OCR, media processing, scheduled sync and provider integrations.

Nexyra

Wi-Fi and LAN diagnostics

Network utility with diagnostics, device discovery, port scans, reports, subscriptions and analytics.

SwiftLand / Local servers

Docker, monitoring and admin tools

Self-hosted services, Nginx routing, Docker Compose, status dashboards, protected admin panels, maps, voice, backups and automation.

Stack

Tools I use to ship real things

SwiftSwiftUIUIKitCore DataStoreKit RevenueCatPythonFastAPIPostgreSQLRedis DockerNginxLinuxOpenAI APIGemini API WhisperFirebaseAmplitudeAPNSESP32 Raspberry PiMQTTUSB / SerialTelegram Bots

Next step

Have an IT task? Send me what should work.

A short message is enough: what you want to build, what already exists, what is broken, and what deadline matters.

Write in Telegram

Released apps

Published and in-house products

GitHub LinkedIn Telegram