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I will be your java spring boot developer for apis, microservices and bug fixes
Kevin
5.0
5.0
About this gig
Need a senior Java developer who gets it right the first time? I have 10 years of hands-on Java and Spring Boot experience building production backends for fintech, payments, trading, enterprise and IoT projects.
What I can do for you:
- Fix bugs, errors and slow endpoints in your Spring Boot app
- Build REST APIs and complete microservices from scratch
- Kafka, Redis, WebSockets, Spring Security and JWT/OAuth
- MySQL, PostgreSQL, MongoDB and SQL Server, plus query tuning
- Third-party API integrations: payments (Stripe, Razorpay), KYC, AWS
- Upgrade to Spring Boot 3/4 and Java 21
- Docker setup, deployment and code review
What you get:
- Clean, tested, documented code that you own
- Clear updates while I work
- A short note explaining what I changed and why
Please message me before ordering with your requirement, repository or error log. I'll confirm the right package or send a custom offer.
Get to know Kevin
Kevin
Senior Java Spring Boot Engineer, AI, Payments and Trading Systems
- FromIndia
- Member sinceNov 2019
- Avg. response time1 hour
- Last delivery2 years
Languages
English
Senior Java / Spring Boot engineer with 10 years of hands-on experience building production backends: microservices, REST APIs, payment and enterprise integrations, and real-time trading systems.
What I build: AI features in Java apps (Spring AI, RAG, MCP servers), invoice and document automation (OCR + AI, PDF, SAP/ERP), payment gateways (Stripe, Razorpay, crypto wallets) and trading automation (TradingView webhooks, broker APIs, bots).
Clean, tested code you own. Message me your requirement for a plan and a fixed quote.
FAQ
Can you work on my existing Spring Boot project?
Yes. Most of my work is on existing codebases. Share repository access and a short description, and I will review the code before we agree on the scope.
Which Java and Spring Boot versions do you work with?
Java 8 to 21 and Spring Boot 1.x to 3.x, with Maven or Gradle. I can also upgrade older apps to current versions.
Reviews
2 reviews for this Gig
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| (0) | ||
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Rating Breakdown
- Seller communication level
- Recommend to a friend
- Service as described
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Most relevant
R 
ramsyvor
Turkey
Very knowledgeable and helpful, professional, did my project in timely manner, highly recommended.
$200-$400
Price
4 days
Duration
Helpful?N nachothomas
Australia
Very knowledgeable, extremely friendly and helpful. Wouldn't hesitate to use again in the future. 10/10.
$50
Price
Helpful?
Reviews
2 reviews for this Gig
| (2) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Recommend to a friend
- Service as described
Sort By
Most relevant
R ramsyvor
Turkey
Very knowledgeable and helpful, professional, did my project in timely manner, highly recommended.
$200-$400
Price
4 days
Duration
Helpful?N nachothomas
Australia
Very knowledgeable, extremely friendly and helpful. Wouldn't hesitate to use again in the future. 10/10.
$50
Price
Helpful?
