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.

genekogan.com

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FXEmpire - Financial Markets & Trading Platform

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Finance

Node.jsTypeScriptREST APIsBackend Services

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.

Next.jsNestJSPostgreSQLRedis

KeepComing - Digital Loyalty Platform for Independent Shops

Small independent businesses — cafes, restaurants, salons, barbers, retail shops — run on regulars. The paper punch card is the oldest, most reliable retention tool in that world, and also the most fragile: cards get lost, forgotten, or thrown in a drawer. Every existing digital alternative asked customers to download yet another app, which is exactly the friction that kills adoption at the counter. KeepComing set out to build something a customer could opt into in under fifteen seconds, with no download, no account setup, and no card to lose, using infrastructure they already carry: Apple Wallet and Google Wallet. It also targeted a segment most SaaS loyalty tools ignore, independent shops, because average revenue per customer is too small for enterprise sales motions.

Next.jsTypeScriptReactWeb3

VeenoX — DeFi Trading & Learning Platform

VeenoX set out to build a decentralized trading platform that delivers a centralized-exchange-quality experience while addressing a major problem in the perpetual trading ecosystem: users often chase trading volume and airdrops without developing real trading knowledge. The platform needed to combine advanced trading workflows with an integrated learning and progression system.

SvelteNode.jsPostgreSQLREST APIs

HeartCloud - Digital Health & Remote Patient Monitoring

Healthcare practices need to manage increasing amounts of patient-generated health data from connected devices while keeping that information useful alongside existing medical records. HeartCloud addresses this by bringing physiologic measurements, patient-reported data, and medical-record information together within the clinical workflow. As a contractor, I contributed to a specific part of the platform focused on connecting digital health data with the application experience and making that information easier to visualize and use.

Next.jsFastify (Node.js)FastAPI (Python)Google Cloud Platform

How I Work

MY PROVEN PROCESS

Discover

Understand your goals, users, and requirements to define a clear roadmap.

Project brief

Tech architecture

Timeline plan

Project briefTech architectureTimeline plan

Design

Create wireframes, prototypes, and polished UI that users love.

Wireframes

Figma prototype

Design system

WireframesFigma prototypeDesign system

Develop

Build with clean, scalable code using agile sprints and regular demos.

Clean code

Unit tests

API docs

Clean codeUnit testsAPI docs

Deploy

Ship with CI/CD, cloud setup, domain, SSL — zero downtime guaranteed.

Docker setup

CI/CD pipeline

Cloud infra

Docker setupCI/CD pipelineCloud infra

Support

Ongoing monitoring, bug fixes, and feature updates post-launch.

Monitoring

Bug fixes

New features

MonitoringBug fixesNew features

See My Full Process

Achievements

I TAKE PRIDE IN
MY ACCOMPLISHMENTS

Key milestones and measurable outcomes from my engineering career.

50+Projects Completed

8+Years Experience

30+Technologies Mastered

100+REST APIs Designed

Client Delivery

From Idea to Live Product — End to End

Built and shipped production-ready platforms like Eden, a multi-modal generative AI platform for autonomous agents and image, video, and audio workflows, and Keepcoming, a multi-tenant loyalty platform with live Apple Wallet and Google Wallet integration, taking projects from architecture and development through deployment.

Full-Stack Range

30+ Technologies, One Trusted Developer

React, Next.js, Node.js, Python, FastAPI, Laravel, Spring Boot, PostgreSQL, Docker, AWS, and GCP, I choose the right technologies for each project. From frontend experiences and backend APIs to authentication, integrations, cloud infrastructure, and deployment, I work across the full stack.

Real Impact

APIs & Integrations Powering Business Workflows

Design and build production APIs that connect applications, business systems, and third-party platforms. From REST APIs and webhooks to OAuth, data synchronization, middleware, and event-driven workflows, I build integrations that automate real business processes and keep critical systems connected.

FREQUENTLY ASKED QUESTIONS

COMMON QUESTIONS

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Engineering Insights & Deep-Dives

LATEST ARTICLES &
TECHNICAL GUIDES

In-depth system architecture decisions, backend performance tuning, AI engineering, and modern DevOps strategies written by Gianni Vilayhane.

Explore All Articles (6)

Engineering Autonomous Agentic AI Assistants with Next.js 15 & Gemini 2.0

★ FEATURED GUIDEAI Engineering

2026-07-28•10 min read•9.4k views

Engineering Autonomous Agentic AI Assistants with Next.js 15 & Gemini 2.0

A deep technical dive into building Production-Ready Agentic AI workflows with streaming responses, function calling, tool execution, and context persistence in Next.js 15.

#AI Engineering#Gemini 2.0#Next.js 15#TypeScript

2026-06-1512 min read

Microservices vs Monolith in 2026: The Complete Architectural Framework

The monolith vs microservices debate isn't black and white. Here is a practical framework for deciding which architecture fits your software scale — with cost and SLA analysis.

#Architecture#System Design#Microservices

Read Full Article

Spring Boot Performance Tuning: From 200ms to 12ms High-Concurrency Throughput

Backend

6.2k views

2026-05-2012 min read

Spring Boot Performance Tuning: From 200ms to 12ms High-Concurrency Throughput

A step-by-step guide to optimizing Spring Boot application performance — covering HikariCP connection pooling, Redis caching, JVM GC tuning, and Virtual Threads.

#Java 21#Spring Boot#HikariCP

Read Full Article

Docker & Kubernetes in Production: 10 Costly Mistakes & Zero-Downtime Fixes

DevOps

3.9k views

2026-04-1013 min read

Docker & Kubernetes in Production: 10 Costly Mistakes & Zero-Downtime Fixes

From running containers as root to missing health checks, these are the most common DevOps mistakes in production — and how to fix each one with Dockerfile blueprints.

#Docker#Kubernetes#DevOps

Read Full Article

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LET'S WORKTGETHER

Or email me at gianni@giannivilayhane.com

BUILD SOFTWAREAI SYSTEMSGROW YOUR BUSINESS

EVERYTHING YOU NEED,FROM ONE DEVELOPER

Custom Business Website Development

Web Application & SaaS MVP Development

Cross-Platform Mobile App Development

Desktop Application Development

Domain & SSL Protection

SEO & GEO Optimization

Digital Marketing & Growth

Agentic AI Chatbots & Automation

System Integration & Business Automation

I'VEBUILTFOR CLIENTS

EDEN - Autonomous Creative AI Studio

FXEmpire - Financial Markets & Trading Platform

KeepComing - Digital Loyalty Platform for Independent Shops

VeenoX — DeFi Trading & Learning Platform

HeartCloud - Digital Health & Remote Patient Monitoring

EDEN - Autonomous Creative AI Studio

FXEmpire - Financial Markets & Trading Platform

KeepComing - Digital Loyalty Platform for Independent Shops

VeenoX — DeFi Trading & Learning Platform

HeartCloud - Digital Health & Remote Patient Monitoring

MY PROVEN PROCESS

Discover

Design

Develop

Deploy

Support

I TAKE PRIDE INMY ACCOMPLISHMENTS

From Idea to Live Product — End to End

30+ Technologies, One Trusted Developer

APIs & Integrations Powering Business Workflows

COMMON QUESTIONS

LATEST ARTICLES & TECHNICAL GUIDES

Engineering Autonomous Agentic AI Assistants with Next.js 15 & Gemini 2.0

Microservices vs Monolith in 2026: The Complete Architectural Framework

Spring Boot Performance Tuning: From 200ms to 12ms High-Concurrency Throughput

Docker & Kubernetes in Production: 10 Costly Mistakes & Zero-Downtime Fixes

Stay Ahead in Software Engineering

LET'S WORKTGETHER

BUILD SOFTWARE
AI SYSTEMS
GROW YOUR BUSINESS

EVERYTHING YOU NEED,
FROM ONE DEVELOPER

I'VE
BUILT
FOR CLIENTS

I TAKE PRIDE IN
MY ACCOMPLISHMENTS

LATEST ARTICLES &
TECHNICAL GUIDES