You will get A Spring Boot 3 to 4 upgrade assessment: breaking changes, effort, risk
Project details
Spring Boot 3.5 went end of life on 30 June 2026. If you're on any 3.x branch you're running unpatched, and Boot 4.0 brings 83 breaking changes.
I assess what that migration actually costs you before you commit to it. 12+ years on JVM systems, 4,900+ hours delivered, mostly regulated fintech.
WHAT YOU GET
• Dependency and version inventory across your build
• Every breaking change mapped to the code it touches
• Effort estimate in hours, broken down by module
• Risk register: CVE exposure, silent runtime failures, hard blockers
• Sequenced migration plan you can put into sprint planning
• Walkthrough call to defend the numbers
HOW IT RUNS
Days 1-2 - I read the build files and dependency tree.
Days 3-5 - breaking-change mapping and effort estimation.
Days 6-7 - risk register, plan, walkthrough.
WHAT I WON'T DO
Tell you it's a two-week job because that's what you want to hear. If your estate needs 400 hours, the number says 400 and you get the reasoning behind it.
Before ordering, send your Spring Boot and Java versions and your build file.
I assess what that migration actually costs you before you commit to it. 12+ years on JVM systems, 4,900+ hours delivered, mostly regulated fintech.
WHAT YOU GET
• Dependency and version inventory across your build
• Every breaking change mapped to the code it touches
• Effort estimate in hours, broken down by module
• Risk register: CVE exposure, silent runtime failures, hard blockers
• Sequenced migration plan you can put into sprint planning
• Walkthrough call to defend the numbers
HOW IT RUNS
Days 1-2 - I read the build files and dependency tree.
Days 3-5 - breaking-change mapping and effort estimation.
Days 6-7 - risk register, plan, walkthrough.
WHAT I WON'T DO
Tell you it's a two-week job because that's what you want to hear. If your estate needs 400 hours, the number says 400 and you get the reasoning behind it.
Before ordering, send your Spring Boot and Java versions and your build file.
Programming Languages
Java, KotlinCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$1,200
|
Standard
$2,900
|
Advanced
$6,500
|
|---|---|---|---|
| Delivery Time | 7 days | 14 days | 30 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$400 - $1,000
Additional Revision
+$150
Executive risk brief
(+ 2 Days)
+$600
Pilot Migration
+$1,800Frequently asked questions
15 reviews
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TW
Tobias W.
May 25, 2026
Senior Frontend Developer (React/TypeScript)
Amit was a pleasure to work with. He understood the requirements quickly, asked the right questions upfront, His attention to detail, professionalism really stood out.
He was patient with revisions and proactive in suggesting improvements. I'd recommend him without hesitation.
He was patient with revisions and proactive in suggesting improvements. I'd recommend him without hesitation.
BD
Barry D.
Feb 13, 2026
Java Application Support Development
BL
Benoit L.
Sep 22, 2025
Backend Engineer (Java / Spring Boot / API Integrations)
Amit delivered good work on this development project and I enjoyed working with him. His communication was top-notch, he met all deadlines, and his skills were reasonably strong.
YG
Yoab G.
Jan 3, 2025
Java with Spring Boot Developer (Experienced)
HS
Hiren S.
Apr 26, 2024
Strong spring boot developer
Amit is strong backend developer. Was happy with the performance and to the point discussion with him. Will be rehiring him for future development.
About Amit
Java & Spring Boot Architect | SaaS Backends | AI/LLM Integration
82%
Job Success
Jaipur, India - 3:31 am local time
WHAT I ACTUALLY DO
- Spring Boot modernisation — monolith extraction, microservices, performance and cost work
- AI/LLM integration into existing backends — RAG pipelines, retrieval, workflow automation
- SaaS platform builds — multi-tenant, subscription-ready, greenfield or on an existing codebase
- API design — REST and GraphQL, versioned, documented, production-grade
- Enterprise workflow and ITSM — ticketing, service management, ServiceNow integration
CAREER DELIVERY
- Financial reconciliation engine for a top-10 US custody bank — 2M+ transactions/day, reconciliation time down ~60%
- SaaS bookkeeping platform scaled to 10,000+ users, later acquired
- Microservices backend for a cybersecurity SaaS serving 500+ enterprise clients
- ITSM workflow automation — ticket resolution time down ~40% across three service desks
STACK
Backend — Java, Spring Boot, Spring Security, Microservices, REST, GraphQL, Node.js, NestJS
Frontend — React, Next.js, TypeScript, Tailwind
AI — OpenAI API, Claude API, RAG, LLM integration, workflow automation
Cloud — AWS, Azure, GCP, Docker, Kubernetes, Terraform, GitHub Actions, CI/CD
Data — PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch
HOW I WORK
Written tradeoff notes before code. Architecture decisions documented as ADRs. Weekly demos. I flag the expensive parts of your idea early, before you've paid for them — and I'll tell you when I think you've picked the wrong first problem to solve.
WHO I'M NOT FOR
I'm not the right fit for WordPress, Shopify or template sites, and I don't take work where the deciding factor is the lowest bid. If you need a senior pair of hands to own architecture decisions and defend them, we'll work well together.
FIRST MESSAGE
Send me your stack and the one thing that keeps breaking. I'll tell you in the first reply whether I'm the right call.
Steps for completing your project
After purchasing the project, send requirements so Amit can start the project.
Delivery time starts when Amit receives requirements from you.
Amit works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery
Repository and dependency inventory delivered
Risk Assessment
Breaking changes mapped against the 83 known Boot 4.0 changes