You will get Enterprise Legacy System Modernization and Performance Optimization
Top Rated
Project details
You will get expert-led legacy system modernization that transforms outdated legacy software into fast, scalable, and maintainable solutions. Our team specialises in legacy modernisation, legacy migration, and legacy system optimization across .NET, .NET Core, Java, and Java Spring Boot stacks. Whether you need a full legacy application modernization, legacy code refactoring, legacy database migration, or performance optimisation for a legacy enterprise system, we deliver reliable results. We've handled complex legacy modernization projects in fintech, defense, and enterprise software, including custom integration with third-party APIs, banking services, and cloud platforms like Azure. Our legacy modernisation approach combines architecture redesign, legacy system optimization, automated testing, and custom integration to ensure your legacy software becomes a modern, high-performing, future-ready system — without disrupting your business operations.
Programming Languages
ASP.NET, Java, C#Coding Expertise
Cross Browser & Device Compatibility, Performance OptimizationWhat's included
| Service Tiers |
Starter
$1,600
|
Standard
$3,500
|
Advanced
$7,000
|
|---|---|---|---|
| Delivery Time | 14 days | 21 days | 30 days |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
4 reviews
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DL
Drew L.
Jun 21, 2026
Full Stack Developer
Fantastic to work with. Great outcome.
IG
Iryna G.
Jun 19, 2026
Java Developer Needed - Quick Task
Great experience working with Ihor! He delivered quality work on time, communicated well, and was easy to collaborate with. I'd be happy to work with him again.
NA
Nick A.
Jun 13, 2026
Revive a legacy .Net application, upgrade to currently supported frameworks
Great team to work with. Open to working again when the schedule clears up.
ZI
Zolta I.
Apr 1, 2024
.NET DMS
About Ihor
Java Developer | Full Stack Developer | Spring Boot, React & SaaS
100%
Job Success
Lviv, Ukraine - 12:45 am local time
As a Java Developer and full stack developer, I design, build, and ship production-ready software systems and platforms end-to-end: architecture, backend, frontend, and deployment.
On the backend, my core stack is Java, Core Java, Spring Boot, and Spring Framework, building REST APIs, microservices, and scalable software systems with Hibernate/JPA, SQL, PostgreSQL, MySQL, and MongoDB. As a Java backend developer, I've designed 120+ REST APIs and built 10+ microservice architectures for systems and platforms serving 10K to 500K+ users. I've shipped 35+ production software systems, platforms, and web applications as a full stack developer and Java developer.
On the frontend, I build with React, Angular, JavaScript, and TypeScript, delivering full stack web applications and SaaS platforms where clean UI meets solid backend architecture. Whether it's a software system, an internal platform, or a customer-facing SaaS product, I work across the whole stack to make sure the system holds up in production.
For infrastructure, I work with AWS, GCP, and Azure, using Docker, Kubernetes, and CI/CD pipelines to keep systems, platforms, and software reliable at scale. The software systems and platforms I've maintained as a full stack developer and Java developer have held 99.9% uptime — the result of solid monitoring, careful deployment practices, and proactive system design.
Performance is something I take seriously on every platform and system I build: as a Java Developer, I've cut API response times by up to 60% and improved overall system performance by 40%+ through targeted software architecture improvements rather than costly rewrites. I've also worked extensively with enterprise-level database schemas, optimizing complex SQL queries and data models across tables with 100K+ records.
Beyond Java, I also write Python, PHP, and Node.js when a software system or platform calls for it, and I've worked on .NET/C# projects too, including reviving a legacy .NET system onto currently supported frameworks. As a full stack developer, I go where the project needs me. Java is my strongest ground, but I adapt the stack to the system. As a Java Developer, I've also earned certifications in Java Backend API Development and Java Microservices Engineering — production depth, not just a keyword on a profile.
Beyond hands-on development, I've led teams, mentored junior developers, and managed cross-functional projects across software systems and SaaS platforms. My clients get clear communication, fast responses, and maintainable software code that still makes sense six months later.
🤝 Let's talk
I'm open to long-term collaborations as a Java Developer or Full Stack Developer — Spring Boot, backend systems, SaaS platforms, enterprise software, microservices, and web applications — plus related work in cloud migration, API integration, database development and optimization, and legacy system modernization. If you need a Java Developer or Full Stack Developer who ships reliable SaaS platforms and software, let's talk.
Steps for completing your project
After purchasing the project, send requirements so Ihor can start the project.
Delivery time starts when Ihor receives requirements from you.
Ihor works on your project following the steps below.
Revisions may occur after the delivery date.
Intro call
We'll have an intro call to discuss your system, goals, and priorities.