Advanced Java Spring Boot Development

@rohitpatidar001

Hello, I'm a Senior Java Spring Boot Developer with 11+ years of experience building secure, scalable enterprise backend applications. My expertise includes Java, Spring Boot, Spring Security, REST API development, JWT authentication, PostgreSQL/MySQL, API integrations, and enterprise backend architecture. I have experience designing clean APIs, implementing role-based security, integrating third-party services, and developing maintainable microservice-ready applications. I focus on writing clean, well-documented, and testable code while following best practices for performance, security, and scalability. I communicate regularly, meet deadlines, and provide reliable long-term support when needed. I can assist with Spring Boot API development, API integrations, Spring Security, OAuth/JWT authentication, database design, encryption implementations, and backend optimization. I'm available to start immediately and would be happy to discuss your requirements in detail. Looking forward to working with you. Best regards, Rohit

@onkarkulkarni8

Hi, I can help with your "Advanced Java Spring Boot Development" project. I develop clean, maintainable PHP backends — core PHP and Laravel/Symfony, MySQL schema design, and well-structured REST APIs. For work involving java, j2ee, software architecture, mysql, java spring, api development, spring boot, spring security, I pay close attention to validation, security, and readable code, delivering in small, testable milestones. I provide clean commits and clear documentation. Could we discuss the specifics before I firm up the timeline? ⭐ 5.0/5 from a recent client: "Project was delivered before Time with Best professional Knowledge One could ever held. Thanks for the support" Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.

@vineetmishra82

Hi, I am a Java with Spring /Spring Boot, C, C++,.Net,C#, Python, Trainer & Web Developer(HTML,CSS,BootStrap, JS,Angular,ASP.Net,Django) for more than 12 years and have completed lot of similar projects in the past. My client lists include University of Geneva and University of Tokyo. I have worked with all types of SQL/NoSQL databases too. My goal is to obtain challenging work with 100% client satisfaction and highly budgeted costs. Given an opportunity will provide a viable and timely solution. Kindly contact me to discuss further. Regards Vineet Mishra

@sanarena

Hi, I'm Armin Nikdel. I can build the Spring Boot backend you need, covering REST APIs, microservices, JWT-based security, and PostgreSQL integration. I'll start by setting up a clean Spring Boot project with layered architecture, then implement secure endpoints with Spring Security and JWT for authentication and role-based access. For encryption needs, I'll integrate AES/RSA using standard Java crypto libraries, and handle OAuth flows if third-party auth is required. I'll use PostgreSQL as the database with parameterized queries and server-side validation to prevent injection and data issues. All sensitive data will be encrypted at rest where specified, and I'll add rate limiting on critical endpoints along with structured logging that avoids exposing secrets. The deliverables will include a tested, documented API and a simple admin panel if needed for basic data management. Could you clarify whether the OAuth integration is for acting as a provider or consuming external providers like Google/GitHub? That will help me finalize the security module design. I can deliver this in about 6 days for INR 1250.

@ParasTech7

Hi, I have 21+ years of experience in Java, Spring Boot, REST APIs, microservices, Spring Security (JWT), and PostgreSQL/MySQL. I've built scalable backend services, integrated third-party APIs, and worked on production-grade applications deployed on AWS. I can deliver clean, secure, and well-documented code while maintaining clear communication throughout the project. I'd be happy to discuss your requirements and can start immediately.

@belotefreelancer

"I have gone through your description. "This is my area of specialization, i can get it done 100 % perfectly well. Please ping me in person. I can help you to complete all tasks. I have hands-on experience in this field. We have already done similar types of projects. Connect with us for more details. Rest assured your satisfaction is guaranteed." Looking forward to your response." Thank you for your time and I am confident that we will be a great fit for this project. Best,

@vishal1145

Your current Spring Boot architecture will face authentication bottlenecks if you're handling JWT refresh tokens without Redis caching. This creates database load that slows API response times under concurrent user sessions. Quick questions - are you implementing role-based access control with Spring Security, or do you need custom authorization logic? And what's your target API throughput (requests per second)? Here is the architectural approach: - SPRING SECURITY JWT: Build token-based authentication with refresh token rotation and Redis session management to prevent database overload during peak traffic. - MICROSERVICES ARCHITECTURE: Design service-to-service communication using Feign clients with circuit breakers to prevent cascading failures across your distributed system. - API ENCRYPTION: Implement AES-256 encryption for sensitive payloads and RSA key exchange for OAuth flows, ensuring compliance with data protection standards. I've built similar Spring Boot microservices for 2 fintech platforms processing 10K+ transactions daily without downtime. Let's schedule a 15-minute call to review your database schema and API contracts before implementation.

@ashinnd84

Hi there, we are a team of AI/ML Full Stack Web and Mobile App Developers and we can do this project in no time. Thanks Ashish Kumar.

@ThinhSenDev

Hi, Senior Java engineer, 8+ years, most recently 2 years as a Java Developer for Fortna (US) — built and maintained a distributed Warehouse Execution System handling 5-10M requests/day for enterprise clients (H&M, Rolls Royce). Currently also working with an international team (Singapore Airlines) on cloud-native system migration. Directly relevant to your requirements: - Backend & APIs: Java, Spring Boot, REST/SOAP, microservices - Event-driven systems: Kafka, NATS, Saga pattern, CQRS, Event Sourcing - Cloud: AWS, Kubernetes, Docker, CI/CD (Jenkins, ArgoCD, GitHub Actions) - Databases: Oracle, PostgreSQL — performance tuning at 10-15M requests/day scale (telecom system for 30M+ subscribers, VNPT NET) - Banking EKYC platform (TPBank) serving 12M+ customers Not a native speaker, but I run daily technical discussions, code reviews, and client meetings in English with US and international stakeholders — happy to prove this on a call. Available to start immediately.

@abhayk49

Hi, I’m a Java Backend Developer with 6+ years of experience specializing in Spring Boot, REST APIs, Microservices, and secure backend development. ✅ My Expertise ✅ Java & Spring Boot ✅ REST API Development & Integration ✅ Microservices Architecture ✅ Spring Security, JWT & OAuth2 ✅ AES/RSA Encryption ✅ PostgreSQL, MySQL & MongoDB ✅ JPA/Hibernate & Maven ✅ Docker, Git & CI/CD I have built and maintained enterprise backend applications, including ERP, CRM, marketplace, logistics, and API integration platforms. My focus is on writing secure, scalable, and maintainable code while ensuring high performance and reliability. I'm available to start immediately and can contribute to both new feature development and ongoing maintenance. Best regards, Abhay Kumar

@thiagofoz87

Your project requires more than basic Spring Boot implementation — the combination of API integrations, microservices, OAuth/JWT security, encryption, and PostgreSQL indicates a backend that must be reliable, secure, and maintainable under real production load. I can contribute across the full backend lifecycle: designing and implementing Spring Boot services, building REST APIs, integrating third-party systems, securing endpoints with JWT/OAuth2, and handling AES/RSA encryption flows correctly with attention to performance and security practices. I also have strong experience with PostgreSQL schema design, transactional consistency, asynchronous communication patterns, and scalable microservice architecture. For this project, I would focus on: - clean service separation and maintainable architecture - secure authentication/authorization flows - resilient API integrations with proper error handling and retries - optimized database access and query performance - clear documentation and predictable delivery I can join quickly, review the current architecture if it already exists, and start contributing to implementation immediately. Communication is direct and technical, with regular progress updates and attention to delivery quality.

@agwidfrnd19

With over 8 years of experience in MySQL and web development, I bring a wealth of expertise to Advanced Java Spring Boot Development project. Having worked on a range of technologies like Javascript, Ajax, Php, Nodejs, Angularjs, Wordpress, Laravel, Codeigniter among others, languages used in Java development are not new to me. Furthermore, my current role as a PHP developer incorporates crucial skills such as API Integration, REST, and Backend Development. This real-world experience means that I am well-versed in the code development process and proficient in attaining fast and effective solutions. Paired with my adaptability and drive to go above and beyond for clients, I am certain that these qualities will make me an asset for your project. To add, working at Apcomp Infotech LLP has honed my ability to handle databases with high volumes of data effectively. Given that your project involves PostgreSQL and spring security JWT which requires skills in encryption techniques for top-level security; I have proven abilities in these areas. Overall, my journey as a developer positioned me better to tackle the exact demands your project entails. Looking forward to bringing my expertise on board to transform your vision into a robust reality!

@alexkvat

Hey — been doing Java backend work for over 20 years. Spring Boot, microservices, security, encryption, API integrations — that's basically what I do every day. Not gonna waste your time with a long intro. Here's what I bring to the table: Security & Auth — built JWT + OAuth2 flows with token rotation backed by Redis. No DB round-trip on every request, handles high concurrency without breaking a sweat. Encryption — AES-256 + RSA hybrid for secure payload transport. AES does the heavy lifting, RSA handles the key exchange. Clean separation, no shortcuts. API Integrations — payment gateways, webhooks, retry logic with exponential backoff, idempotency keys so nothing processes twice. Done this more times than I can count. PostgreSQL — proper indexing, HikariCP pooling, Flyway migrations. The boring stuff that keeps things running at 3am without paging anyone. I work clean — small commits, tested code, documented endpoints. I use AI tools to cut through boilerplate faster, but every design call and security layer is my own. You get production-grade code, not copy-paste prototypes. Available 20-30 hrs/week, consistent schedule. I don't disappear mid-sprint. What's the first thing you need me to pick up — greenfield service, or something existing that needs fixing?

@kuldeepsharma30

Hello, I’m an experienced **Java Spring Boot Backend Developer** specializing in building secure, scalable, and high-performance applications. I can help develop and maintain REST APIs, microservices, and enterprise backend systems with clean, well-documented code. My expertise includes: • Java & Spring Boot Development • REST API Design & Integration • Microservices Architecture • Spring Security with JWT Authentication • OAuth 2.0 & Third-Party API Integration • AES/RSA Encryption & Secure Data Handling • PostgreSQL Database Design & Optimization • Hibernate/JPA & Spring Data • Maven/Gradle, Git, Docker, and CI/CD • API Testing with Postman & Swagger/OpenAPI I focus on writing maintainable, production-ready code with strong security, performance, and scalability. I communicate regularly, meet deadlines, and ensure every feature is thoroughly tested before delivery. I would be happy to discuss your requirements and deliver a reliable backend solution tailored to your project. **Best Wishes,** **Naveen Kumar**

@dushyant317

I can develop secure, scalable Spring Boot microservices and REST APIs with JWT/OAuth authentication, AES/RSA encryption, PostgreSQL integration, and third-party API connectivity, following clean architecture and best practices. The solution will include well-documented code, robust security, optimized performance, comprehensive testing, and deployment support for a production-ready backend.

@deepaksinghkirar

Hi - I am solution architect and a full stack developer. I have extensive working experience on Java and related frameworks/technologies. I can work with you on this. Thanks

@Cruz1217

Token refresh across several Spring Boot microservices often leads to stale JWT errors if each service validates independently. I'll set up a shared Redis cache for short‑lived access tokens and a refresh endpoint that rotates RSA signed tokens. Spring Security will pull the token from the cache and verify the signature before each request. Hard‑coding AES keys in source files is a mistake that often leads to secret leaks when code is shared. I'll load keys from an encrypted vault and use them to encrypt payloads and sign responses on the fly. You’ll get clean REST endpoints that return consistent JSON without ever exposing cryptographic material.

@ikkyur

Hi, I'd be happy to work on this project. I have reviewed the requirements, and I have experience developing secure backend applications with Spring Boot, REST APIs, microservices, Spring Security, JWT authentication, OAuth integration, PostgreSQL, and encryption using AES/RSA. I can deliver clean, scalable, and well-documented solutions with reliable API integrations and strong security practices. I always maintain clear communication, provide regular progress updates, and take ownership of the assigned tasks. I'll ensure the code is maintainable, thoroughly tested, and aligned with your project requirements. Looking forward to working with you. Thank you

@dmytrot16

It's evident that your project requires a skilled Java developer with expertise in Spring Boot, API integration, Microservices, REST API, Spring Security JWT, encryption (AES RSA), OAuth, and PostgreSQL. I prioritize quality over price. Guaranteed on-time delivery & 100% satisfaction! For this project, I would focus on creating a robust backend architecture using Java Spring Boot, ensuring seamless integration of APIs and implementing secure encryption techniques like AES and RSA. Additionally, I would leverage Spring Security JWT for authentication and authorization, along with OAuth for API security. Ensuring efficient API integration and seamless communication between microservices would be a key focus. Furthermore, I would pay special attention to implementing best practices for scalability, clean code, and documentation to facilitate future updates and maintenance. I would like to discuss the assignment in our conversation. Thank you for your time. If you don't mind, please reach out to me. Best regards