I build scalable, high-performance backend systems that handle real-time data and production workloads.
With 10K+ earnings, 900+ hours, and 5★ client feedback, I help startups and enterprises develop reliable backend services using Java and Spring Boot.
💡 What makes me different:
I don’t just write APIs — I design systems that scale, perform, and are easy to maintain.
🔹 Core Expertise:
- Spring Boot REST API development
- Microservices architecture
- Real-time systems using WebSockets
- Event-driven systems with Kafka
- Secure authentication (JWT, OAuth2)
- Database design (MySQL, PostgreSQL, Hibernate)
- Performance optimization & bug fixing
🔹 Proven Experience:
- Built backend systems for banking & fintech applications
- Developed real-time data systems (WebSocket + Kafka)
- Delivered production-grade microservices architectures
- Completed 14+ projects with consistent 5★ ratings
🔹 Selected Work:
- Real-time stock system (live updates using WebSockets)
- Spring Boot microservices backend (serverless architecture)
- JavaFX + backend integrated systems
🔹 Why clients trust me:
✔ Clean, production-ready code
✔ Clear and fast communication
✔ Reliable delivery & long-term support
Available: 40hrs/week
Hourly Rate: $15–20 (flexible for long-term projects)
If you need a backend engineer who understands scalability, real-time systems, and production challenges — let’s discuss your project.
Java
Spring Boot
Angular
Microservice
CSS 3
MySQL
JavaScript
Hibernate
jQuery
CSS
AWS Lambda
Database Architecture
Serverless Computing
JavaFX
Database Design
Vishwa P.
Pune, India
$17/hr
5.0
5 jobs
I'm Vishwa, a results-driven software engineer with 5+ years of experience building scalable backend systems, automating workflows, and migrating enterprise applications to the cloud. I specialize in Java, Spring Boot, AWS, and SQL, and I thrive on solving complex problems with clean, efficient code.
💡 What I Do Best:
• Backend Development: Architecting robust REST APIs and microservices using Java, Spring Boot, Maven, and JPA.
• Cloud Engineering: Migrating legacy systems to AWS, implementing CI/CD pipelines with CDK, and securing applications with Vault.
• Automation & Testing: Saving hundreds of manual hours with Selenium-based automation and ensuring reliability with JUnit & Mockito.
• Performance Optimization: Upgrading systems (Java 11 → 17, Spring Boot 2 → 3) for better speed, security, and scalability.
• UI Integration: Building responsive frontends with React.js and integrating seamlessly with backend services.
🏆 Highlights:
• Automated credentialing workflows saving 200+ hours of manual effort.
• Migrated and modernized enterprise apps for Mastercard, Barclays, and Principal Global Services.
• Winner of Star of the Quarter and Best Mentee awards for outstanding contributions.
• Certified in AWS Development, Java Programming, and SQL.
🚀 Why Work With Me:
Even though I’m new to freelancing, that gives you a unique advantage—this project means everything to me. I’ll work harder than anyone else to deliver exceptional results because earning a 5-star rating is my top priority. You’ll get my full focus, energy, and commitment to quality, reliability, and clear communication.
Whether you're launching a new product, optimizing legacy systems, or scaling to the cloud, I bring hands-on experience, proactive collaboration, and a passion for clean architecture. Let’s build something reliable, secure, and future-proof.
Java
TypeScript
React
Git
Spring Boot
SQL
Amazon Web Services
Apache Maven
JUnit
Mockito
JavaScript
Rushabh A.
Pune, India
$25/hr
5.0
3 jobs
I'm a Full-Stack Java Developer with over 8+ years of industry experience. I excel in all aspects of Java application development, from design and development to deployment. I have a proven track record of building robust and Scalable applications across diverse domains.
My Expertise
Full-Stack Development:
Java: Core Java, multithreading, OOP, Spring, Hibernate, Struts, J2EE.
Frameworks & Libraries: Spring, Hibernate, JavaFX, Apache Struts.
Microservices Architecture: Spring Cloud, Netflix OSS, service discovery, load balancing, tolerance mechanisms.
Web Development: JSP, Servlets, RESTful APIs, Angular, React, HTML, CSS, JavaScript.
Databases: MySQL, PostgreSQL, MongoDB, Redis.
Testing & Debugging: JUnit, Mockito.
I also use GitHub Copilot and Claude Code to deliver the best solutions.
✔ LLM integrations (OpenAI, Claude, etc.)
✔ AI-assisted workflow automation
✔ Prompt engineering & optimization
✔ RAG based enterprise search solutions
✔ AI code acceleration using tools like Cursor
✔ Designing AI-ready Microservices architecture
Java Solution Architect: Designing scalable solutions with Java, Spring, Hibernate, and microservices.
DevOps: Cloud setup, infrastructure management, CI/CD. Proficient in AWS (Lambda, EC2, S3, Redshift, SageMaker, Cognito) and GCP (VMs, Google cloud storage).
Domain Experience: Insurance, finance, healthcare, e-learning, e-commerce, travel, real estate, logistics, supply chain, social networking, and education. CRM and ERP systems.
Java
Spring Boot
Spring Batch
TypeScript
Microservice
MySQL
PostgreSQL
API
Google Analytics
ETL
Angular
Data Engineering
Angular 5
React
Hibernate
Apache Kafka
RESTful API
Spring Framework
Ajit K.
Pune, India
$20/hr
5.0
6 jobs
I'm an expert Java Full stack engineer with 10+ years of professional experience
Experience in software industry with Java based technologies. I have been involved across all phases of project development life-cycle. I am expert at database design or create base architecture for J2EE web applications
Experience in complex domains like Adv, Data Migration, Telecoms, eLearning and education, ERP, Healthcare, Internet Security, E-commerce, OSS, CMS, etc.
Technology background:
===================
✅ Programming languages: Java, JavaScript
✅ Client-side: Angular, ReactJS, React Native, Node JS, HTML5, CSS, Bootstrap and other JS/CSS frameworks
✅ Web Services: RESTful, SOAP
✅ DevOps: Linux, AWS, GCP, Docker, TCP/IP based networks
✅ Databases: PostgreSQL, MySQL, Oracle, SQL Server, MongoDB, Elasticsearch
✅ Java development: Spring Boot, Spring, Hibernate, Core Java, Spring Data JPA, Spring Microservices, Kafka etc.
✅ Version Control: Git, SVN
✅ Unit Testing: Junit, Mockito ,TDD,
Project Management tools:
=======================
✅ JIRA
✅ Asana
To establish further healthy relationship allow me to provide satisfying work with meeting your expectations successfully and has the potential to maintain a long term relationship.
Clear code with suitable commenting.
Good communication to fulfil your requirements
I am pretty flexible with respect to working hours.
Java
Apache Kafka
MySQL
HTML
Google Cloud Platform
Elasticsearch
React
Spring Boot
RESTful Architecture
JavaScript
Microservice
React Native
Angular
JDBC
Maximo Asset Management
Hibernate
Ashish D.
Pune, India
$30/hr
5.0
14 jobs
Top-Rated Java Developer | $40K+ Earned | 100% Job Success
With over $40K earned on Upwork, I am a highly skilled Java Developer with experience across 8 international projects. My expertise has consistently earned me 5-star ratings, making me a top-rated freelancer on the platform. I specialize in Java and J2EE technologies, delivering robust and scalable solutions that exceed client expectations.
Highlights:
- 8 International Projects successfully completed, including complex real-time systems and
enterprise applications.
- $12,460 Project for Java Stream Analyzer using Esper CEP and Spring Boot.
- 500+ Hours dedicated to delivering high-quality solutions for clients globally.
Client Feedback:
"Ashish is the best developer we’ve worked with so far!"
"Exceptional Java expertise with a perfect blend of professionalism and dedication."
Looking for a reliable and proficient Java Developer? Let’s connect and bring your project to life with top-tier development services.
Availability: More than 30 hours/week | $30/hr
Java
Spring MVC
jQuery
Spring Boot
Microservice
Java Persistence API
RESTful API
Spring Security
JavaScript
Jakarta Messaging
Rishi R.
Pune, India
$24/hr
4.2
55 jobs
Full Stack Developer of Web Applications, Console-based Systems and Microservices
===================================================================
I have 15 years of professional experience in software programming and coding with Java, JavaScript, HTML, CSS and related frameworks/libraries, along with API documentation and DevOps / CI/CD powered by Docker/Kubernetes and Cloud.
Programming languages and environments:
RESTful APIs with Spring Boot 3, Spring Cloud, Spring Security and Spring Data. React, Angular and NodeJS with TypeScript. I love to design, implement and deliver new applications as well as fixing and improving existing features.
I can edit web pages and applications in HTML5, CSS2, modern JavaScript (ES6+), TypeScript, Bootstrap, Java 21, Bash scripting, XML, SQL, PL/SQL, MongoDB and JSON.
Source code management and version control:
My favorite is Git, as in GitLab, GitHub, BitBucket. I edit Markdown files using Typora and Jupyter Notebooks. Trying my hands on Kaggle projects in free time.
Methodology and Team Communication Style:
Agile (Scrum, Kanban), Kaizen, Collaborative work style in team to maintain positivity and excitement.
Proofread | Translation | English | Hindi | Markdown | Typora | Jupyter Notebook
=============================================================
By passion, I am a linguist and translator. By natural talent, I am an error-picker and proofreader.
The various kinds of formal documents and webpages I have proofed- Whitepapers, business pitch decks, blog posts, whole website, Android app code strings and more.
Kindly have a look at my past projects. The great and caring clients have blessed me with 5-star ratings along with quite empowering feedback comments.
Proofreader and Translator. Native level in English and Hindi languages with extensive knowledge and impeccable skills in grammar, punctuation, spelling, choice of words and consistent flow. Good working knowledge of and over 10 years of hands-on experience on Office software tools like Word, PowerPoint, Excel and Google Docs. I provide clients with amended Word documents in any of the two versions - the first one with tracked changes visible and the other one with changes "approved" and frozen - as the demand may be.
Hourly Pay Rate: $14/hr (Preferential and discounted rates available for repeating clients)
I assure my clients of error-free outputs delivered well by agreed-upon timelines, keen attention to detail and client delight every single time. I pose queries wherever required because tendency to perfection and client delight make my mission up. To work with integrity is my vision. Quality is not compromised for the sake of timelines. I handle documents and data in a professional manner.
Translator. Bilingual with Hindi and English. I have fair knowledge of cultural differences among dialects and variants of English, including English (U.S.), English (Australia) and English (U.K.), and contemporary Hindi.
I have good typing speed (high wpm), am proficient in English and Hindi languages, and offer translation services for these languages. I have strong understanding of syntax (grammar), semantics, spellings, punctuation, sentence structure, context setting and collaboration.
Software Tools I use frequently: MS Office (MS Word, MS PowerPoint, MS Excel), Typora, Jupyter Notebook, Sublime Text, Notepad++, Paint (mspaint), LibreOffice, XML, JSON, Sublime Text, VI, VC Code (MS Visual Studio Code), eclipse, IntelliJ IDEA, Ubuntu, RHEL, CentOS
Operating System Classes: Linux, Windows; will add Mac soon
Thank you for reading through and offering me to serve you.
Java
MongoDB
Microservice
Oracle Database
SQL
React
Spring Framework
Core Java
API Development
Docker
Oracle PLSQL
API
Spring Boot
Web Development
AspectJ
Hindi to English Translation
Angular
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