How long does a typical project take?

Timelines vary by scope. A small web app takes 4-8 weeks, a medium full-stack project 2-4 months, and enterprise-grade systems 4-8 months. As a freelance developer, I provide a detailed timeline during the Discovery phase and keep you updated at every sprint.

Do you work with startups or only enterprises?

I work with everyone — from early-stage startups building their MVP to established enterprises modernizing their systems. As a freelance developer, my flexible engagement models adapt to your needs and budget. I'm especially passionate about helping startups launch their first product.

What happens after the project is launched?

Every project includes post-launch support (duration depends on the scope). I handle bug fixes, monitoring, and minor updates. For ongoing needs, I offer freelance retainer packages and dedicated hourly/monthly arrangements.

How do you ensure code quality?

Every line of code goes through peer code reviews, automated testing (unit + integration), linting, and security scans. I follow clean architecture principles and industry best practices. As a freelance developer, my reputation depends on the quality I deliver.

Can you work with our existing team?

Absolutely. I offer staff augmentation, pair programming, and consulting models where I integrate directly with your team. I adapt to your tools, processes, and communication channels. Many clients hire me as a freelance extension of their in-house team.

What technologies do you use?

I specialize in Java, Spring Boot, React, Next.js, TypeScript, PostgreSQL, Redis, Docker, Kubernetes, and Kafka. But I choose technologies based on what's best for your specific project, not one-size-fits-all.

How do I hire you as a freelance developer?

Simply reach out via the contact form or email. We'll start with a free 30-minute consultation to understand your project. I'll then provide a detailed proposal with timeline, cost, and approach. You can hire me for fixed-price projects or on an hourly/monthly basis.

What are your freelance rates?

Every project is unique, so I provide custom quotes based on scope, complexity, and timeline. I offer competitive freelance rates for startups and businesses of all sizes. Contact me for a free estimate — no obligation.

Do you offer ongoing freelance support and maintenance?

Yes! I offer flexible freelance retainer packages for ongoing development, maintenance, monitoring, and feature additions. Many of my clients maintain long-term freelance relationships for continuous product evolution.

Do you sign Non-Disclosure Agreements (NDA) and transfer IP rights?

Yes, 100%. I sign a strict NDA before discussing sensitive project details. Upon full payment, 100% of the intellectual property (IP) rights, source code, design files, and deployment assets belong entirely to you.

Back to Portfolio

Mobile10+ technologies

Vagustim - Wearable Health & Wellness

iOS & AndroidPlatform

FlutterFramework

Bluetooth Low EnergyConnectivity

Bloc + RepositoryArchitecture

HiveLocal Database

Atomic DesignUI Approach

The Challenge

Vagustim is a wearable health and wellness device that delivers gentle electrical pulses through the ears to support stress reduction, sleep, gut health, pain relief, and recovery. The companion mobile app needed reliable Bluetooth connectivity with the device, a scalable architecture for multiple application variants, and a responsive interface that could work consistently across phones and tablets.

The Solution

I contributed to the Flutter application, focusing on BLE connectivity and the overall mobile architecture. I helped combine multiple applications into a single Flutter project using flavors, while implementing a modular architecture based on Bloc and the Repository pattern. I also built reusable UI components following atomic design principles and ensured screens were responsive across different device sizes. For local data management, I implemented a flexible Hive-based database layer using the Strategy pattern.

Key Features

BLE connectivity with the Vagustim wearable device

Flutter flavor-based multi-app architecture

Modular architecture using Bloc and Repository pattern

Responsive interfaces for phones and tablets

Reusable UI components following atomic design principles

Flexible local database layer using Hive

Strategy pattern for adaptable data management

Health and wellness device control experience

The Outcome

The resulting Flutter architecture provides a scalable foundation for the Vagustim companion app, with reliable device connectivity, reusable components, responsive interfaces, and flexible local data management. The modular structure also makes it easier to maintain and extend multiple application variants within a single project.

Android ↗iOS ↗

Tech Stack

FlutterDartBlocRepository PatternBluetooth Low EnergyHiveStrategy PatternAtomic DesignResponsive UIFlutter Flavors

Like What You See?

Let's build something great together.

More Work

View all projects

AI / Technologygenekogan.com

EDEN - Autonomous Creative AI Studio

The generative AI space is dominated by single-shot prompt-and-response tools: type a prompt, get an image, close the tab. Eden set out to build something more ambitious: a platform where creators could build persistent, autonomous AI agents with their own personalities, their own custom-trained visual models, and the ability to collaborate with humans and with each other on multi-step creative work. That meant solving problems the space doesn't have textbook answers for yet — training custom visual models on user-provided samples at reasonable cost, running a workflow ecosystem where community-contributed ComfyUI pipelines could be called autonomously by agents and earn their creators revenue, giving agents context, tools, and identity that persist across sessions, and building all of it on an open-source foundation so the platform stays extensible.

FinanceFXEmpire

FXEmpire - Financial Markets & Trading Platform

FXEmpire operates a large financial publishing and market-data platform covering forex, commodities, stocks, indices, cryptocurrencies, and ETFs. The platform combines financial news and analysis with real-time market information, trading tools, calendars, screeners, and other data-driven features used by traders and investors. My involvement was focused specifically on the backend side of the platform, supporting the APIs and server-side functionality required to deliver reliable financial data and application features without representing the entire FXEmpire product as my work.