High-Performance Spring WebFlux APIs

@onkarkulkarni8

Hi, I can help with your "High-Performance Spring WebFlux APIs" project. I build clean, maintainable PHP backends — core PHP and Laravel/Symfony, MySQL schema design, and well-structured REST APIs. For work involving java, j2ee, nosql couch & mongo, docker, restful api, spring boot, spring security, I pay close attention to validation, security, and readable code, delivering in small, testable milestones. You'll get clean commits and clear documentation. Can we discuss the specifics before I firm up the timeline? ⭐ 5.0/5 from a recent client: "This was wonderful experience and I also got an addtional choice of updating budget and other features which was not available in the old version of my existing software that I used to perform my d…" Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.

@Mayurisalgat13

Hello, Your requirement is very specific: this is not just Spring Boot API work, it is performance-sensitive reactive backend engineering where non-blocking design, connection tuning, and benchmark-driven optimization matter. I can help build and refactor Java 17+/Spring WebFlux REST APIs for your React Native app while keeping latency, scalability, and production readiness as the main priorities. For the <150 ms p99 target, I would first review existing endpoints, identify blocking calls, database bottlenecks, serialization overhead, and connection pool limits, then optimize based on benchmark results rather than assumptions. I have experience working with high-throughput backend systems, REST APIs, PostgreSQL optimization, JWT security, Dockerized deployments, and performance-focused Spring services. I can start with a focused audit/refactor milestone and then move into endpoint development and performance tuning. Best regards, Mayuri Senior Java Backend Developer | Spring Boot | WebFlux | PostgreSQL | Performance Optimization

@albertc1996

Hello, I am a Senior Java Developer with 7+ years of experience building high-performance backend systems using Java, Spring Boot, Microservices, PostgreSQL, and cloud-native architectures. Over the past several years, I have worked extensively on scalable APIs, distributed systems, and performance-critical applications where latency, throughput, and reliability were key requirements. Your project is particularly interesting because it combines several areas where I have strong practical experience: Spring WebFlux, reactive REST APIs, JWT security, PostgreSQL, Dockerized deployments, and performance optimization under heavy load. How I Can Help • Design and implement new reactive REST endpoints using Spring Boot 3 and Spring WebFlux • Refactor existing APIs to eliminate blocking operations and improve throughput • Optimize request processing pipelines using Reactor best practices • Implement JWT-secured endpoints with proper authentication and authorization flows • Improve PostgreSQL interaction patterns, connection management, and query efficiency • Introduce Redis caching where beneficial to reduce database pressure and improve response times • Deliver container-ready services using Docker and Kubernetes-friendly configurations • Generate and maintain OpenAPI/Swagger documentation as part of the build process • Create comprehensive unit and integration test suites Performance-Focused Approach When working on high-throughput systems, I focus on: • End-to-end non-blocking request processing • Avoiding hidden blocking calls within reactive flows • Efficient connection pool sizing • Query optimization and database tuning • Backpressure handling • Response caching strategies • Reactive security implementation • Observability and performance monitoring My goal would be to help ensure your APIs consistently meet the required benchmark targets, including the <150 ms p99 latency objective. Relevant Experience I have worked on enterprise-grade backend platforms where performance, scalability, and reliability were critical requirements, including: • High-volume financial and transaction processing systems • Microservices handling large numbers of concurrent requests • Spring Boot applications deployed in containerized environments • PostgreSQL-backed services requiring careful query optimization and concurrency management • Secure API platforms using JWT-based authentication While many of these systems were implemented using Spring Boot microservices, the same performance engineering principles apply directly to Spring WebFlux workloads, particularly around non-blocking execution, efficient resource utilization, and throughput optimization. Deliverables • New and refactored REST endpoints • Docker-ready deployment artifacts • OpenAPI / Swagger documentation • Unit and integration tests • CI-friendly codebase • Kubernetes-ready configuration • Performance-focused implementation aligned with your benchmark requirements Why I Am a Good Fit • 15+ years of Java development experience • Strong Spring Boot and Microservices background • Experience building scalable, high-concurrency backend systems • Deep understanding of API performance optimization • PostgreSQL expertise including query tuning and transaction management • Focus on maintainable, production-ready code I would be happy to discuss your existing architecture, benchmark requirements, and performance goals in more detail. Kind regards, Albert C. Senior Java Developer

@abhayk49

Hi, I’m a Java backend developer with strong experience in Spring Boot, REST APIs, microservices, and performance optimization, and I can help enhance your WebFlux-based backend while maintaining low latency and scalability. ✅ Relevant Expertise ✅ Java 17+ & Spring Boot ✅ Spring WebFlux & Reactive Programming ✅ PostgreSQL & Query Optimization ✅ JWT Authentication & Security ✅ Docker & Kubernetes-ready deployments ✅ Redis Caching ✅ Swagger/OpenAPI Documentation ✅ JUnit & Integration Testing ? How I Can Help • Develop and refactor reactive REST APIs using Spring WebFlux • Optimize performance with non-blocking patterns and efficient DB access • Implement caching and connection tuning where appropriate • Create comprehensive unit/integration tests • Deliver fully documented APIs with Swagger/OpenAPI • Ensure CI/CD and containerized deployment readiness ✔ Deliverables ✔ Production-ready WebFlux APIs ✔ Optimized PostgreSQL integration ✔ Swagger/OpenAPI documentation ✔ Unit & integration test coverage ✔ Docker/Kubernetes-friendly codebase I have worked on high-throughput Spring Boot microservices, optimizing API performance, database interactions, and scalable backend architectures. Ready to discuss the requirements and start immediately. Best regards, Abhay

@serviceaxisgroup

Hi, I can help with high-performance Spring WebFlux REST endpoints that meet your <150 ms p99 latency target under heavy load. I’ll start by reviewing your current controllers/security flow (JWT, Postgres usage) and setting up a clear reactive baseline, then incrementally refactor endpoints to non-blocking patterns and tune connection sizing. I’ll reduce risk with unit/integration tests, benchmark-friendly instrumentation, and Swagger/OpenAPI generated automatically in the build. Which endpoints need the biggest latency improvements first, and do you already have p99 benchmarks and load-test details? If you share those and your repo structure, I can propose an exact rollout plan for quick, Kubernetes-friendly delivery.

@Visharaa2024

As an experienced and dedicated professional with over 8 years in mobile application development, I am confident that my skill set aligns perfectly with your High-Performance Spring WebFlux APIs project. Having successfully developed and delivered more than 100 applications with a specialization in J2EE, Java, RESTful API, and Spring Boot, I am well-versed in the technicalities involved in creating performant solutions - a crucial aspect of your project. My proficiency in Native Android, iOS, React Native, Flutter, and various relevant technologies makes me certain that I can design and code reactive REST APIs for your application. My history reflects an ability to optimize app performance significantly, squeezing out high throughput even under heavy load times. Integrating this expertise with the robust reactive programming model of Spring WebFlux will ensure latency remains low even as demand for your app grows.

@Hrolgar

One blocking MongoTemplate call inside a WebFlux service layer parks a Netty event loop thread and degrades throughput past what a plain servlet stack would give you. The controllers look reactive while the repository quietly blocks. For this to actually perform: reactive Mongo driver throughout, no .block() anywhere, backpressure signals at the endpoints calibrated for the mobile concurrency pattern. Gatling load test before handoff so you have actual numbers against concurrent React Native clients. Docker compose with health checks matching your production topology. Deliverable: WebFlux API layer with reactive Mongo integration, Dockerized and load-tested. 32,000 INR, 4 days. Is this greenfield or migrating existing blocking repository calls?

@pheonixsolutions

Hello, We can help enhance and optimize your Java 17+/Spring Boot backend to support your React Native application with high-performance, reactive REST APIs. Our approach will include: • Designing and developing new reactive REST endpoints using Spring WebFlux • Refactoring existing APIs to improve scalability, throughput, and response times • Implementing non-blocking patterns and optimizing database interactions with PostgreSQL • Integrating Redis caching where applicable to reduce latency and improve performance • Securing APIs using JWT-based authentication and authorization • Creating container-ready deployments using Docker and ensuring Kubernetes-friendly architecture • Developing comprehensive unit and integration tests with automated coverage reporting • Generating and maintaining Swagger/OpenAPI documentation as part of the build process • Managing source code through GitHub with CI/CD best practices We have experience working with backend systems, REST APIs, database optimization, containerization, and scalable application architectures. Once we review the functional specifications and benchmark requirements, we can provide a detailed implementation plan and timeline. We look forward to discussing the project and demonstrating how we can help deliver a high-performance, production-ready backend solution. Best Regards, Pheonix Solutions

@sgwtechnology

Hi there, I have strong experience building high-performance Java 17+/Spring Boot WebFlux APIs with PostgreSQL, JWT authentication, Docker, and Kubernetes-ready deployments. I can design new reactive endpoints and refactor existing services using non-blocking patterns, optimized connection pools, caching strategies (Redis where beneficial), and performance-focused architecture to consistently meet strict latency targets. **Approach:** • Analyze current API/database bottlenecks and benchmark requirements • Implement/refactor reactive WebFlux endpoints • Optimize PostgreSQL queries and connection sizing • Add automated OpenAPI/Swagger documentation • Develop unit/integration tests with CI coverage reporting • Deliver Dockerized, Kubernetes-friendly builds via GitHub workflows Relevant Experience: Built WebFlux microservices handling high concurrent traffic, reducing response times through reactive pipelines, query optimization, caching, and efficient resource utilization. Clarification Point: Do you already have benchmark scripts and current p99 latency metrics available for review? Thanks!

@Geetam00

With a firm grounding in Java and over five years of full-stack development experience, I guarantee I can create high-performance Spring WebFlux APIs that meet your project's needs. My past work clearly demonstrates my skill in harnessing the potential of this platform to deliver efficient, low-latency systems, even under heavy loads. In one notable project, I successfully implemented non-blocking patterns and Redis caching to optimize performance, significantly reducing latency in API response time. Moreover, I am highly familiar with containerization using Docker and leveraging tools like Swagger/OpenAPI for comprehensive documentation. Additionally, my expertise extends to ensuring seamless integration into CI/CD pipelines and deploying apps in Kubernetes, making sure your code remains cloud-ready. Lastly, I am committed to client satisfaction and have maintained a 100% success rate across more than 1000 completed projects. My response time of less than two hours ensures excellent communication and a quick turnaround on tasks. Partnering with me means you are opting for an expert who truly understands your requirements and is fully dedicated to delivering top-notch results. Let's start building your next-generation Spring WebFlux APIs together!

@shubhankar1967

Hi, I am an IITian with 10+ years of experience to develop similar projects ,I will build reactive REST endpoints using Spring Boot 3.x with WebFlux on Java 17+, leveraging Project Reactor for non-blocking I2O and R2DBC for async PostgreSQL access with optimized connection pooling via r2dbc-pool. Authentication will use reactive Spring Security with JWT via jjwt library, Redis caching with Spring Data Redis Reactive (Lettuce client), and I'll write tests using WebTestClient and reactor-test's StepVerifier, containerize with Docker multi-stage builds, and document all endpoints with SpringDoc OpenAPI 2.x for WebFlux. Kindly click on the chat button so I can share you my relavant projects. Lets connect

@AbhishekYadav306

Building high-performance and scalable applications have been the crux of my career, and your project aligns precisely with my expertise. I'm Abhishek, representing RasuTrip Websoft Technologies and we specialize in Full Stack Development with a strong focus on Spring Boot. Through our distinctive approach, we have helped numerous businesses like yours overcome complex challenges and achieve significant growth. When it comes to Spring WebFlux, I believe we would be the perfect choice for your project. With my proficient skills in Java and extensive background in containerization using Docker and Kubernetes, I can design and code reactive REST APIs that are not only high-performing, but completely user-friendly. The emphasis we put on non-blocking patterns, Redis caching (if required), and connection sizing ensures that latency remains low even under heavy loads - just what you need for your React Native app. Moreover, at RasuTrip, documentation is given top priority. I promise to deliver complete, versioned API docs generated automatically on build using OpenAPI/Swagger. Additionally, I'll ensure full test coverage using CI/CD pipelines for a Kubernetes-friendly environment; all these efforts will make the future cloud rollout as smooth as possible. Trust us to deliver great work, meeting all your functional spec requirements with speed (specifically <150ms p99 time) and accuracy. Let's give your business a digital transformation with lasting impact!

@manishp297

Hello, I am a Full Stack Developer with experience in Java, Spring Boot, React.js, JavaScript, HTML, CSS, SQL, and REST APIs. I have built projects like SplitCoder and DineOS and can deliver clean, responsive, and high-quality solutions. I understand your requirements and am confident I can complete this project efficiently. I am available to start immediately and would be happy to discuss the details further. Looking forward to working with you. Thanks, Manish Prasad

@radheys40

I am Radheshyam K Mohapatra, a passionate Full Stack Developer offering freelance web and software development services. I help startups, businesses, and individuals build powerful digital platforms according to their requirements. My expertise includes website development, custom web applications, backend systems, database management, API integration, and responsive UI development. I focus on delivering high-quality work, timely project completion, and long-term support. Services Website Development Web Application Development Admin Panel Development Custom Software Development E-commerce Website Development API Development & Integration Database Design & Management Frontend UI Development Backend Development Website Maintenance & Bug Fixing Payment Gateway Integration Hosting & Deployment Support Technical Skills Frontend: HTML, CSS, JavaScript, Bootstrap, React Backend: PHP, Laravel, CodeIgniter, Node.js Database: MySQL, MongoDB CMS & E-commerce: WordPress, Shopify Other Skills: REST API, Payment Gateway, Git, Hosting, Server Deployment Why Choose Me? Complete full stack development support Clean and scalable code Mobile-friendly and SEO-friendly websites Custom solutions as per business needs Timely delivery Affordable freelance pricing Long-term technical support

@pallavisahoo301

Hello Team, I have 10 years of experience and have been freelancing for last 4 years. I have excellent experience with Springboot, security, Authorization, Authentication on SpringBoot APIs. I can validate the complete solution E2E and test the benchmark through load test. As additional I can have a review of your complete project to provide key insights on improvements on the existing flow. Lets have a chat to understand the requirements better?

@shailender18

While I specialize in the MEAN/MERN stacks, the logic, principles, and practices I employ are universally applicable to web development, making me a perfect fit for your task. My proficiency extends through the entire project cycle; from designing and coding reactive REST APIs ready for containers with Docker, to fine-tuning performance through non-blocking patterns and Redis caching - if necessary. Moreover, my focus on security aligns perfectly with your project's objective of securing each call with JWT. This will ensure your API endpoints are robustly protected against any unauthorized access. I strongly believe in keeping comprehensive documentation of every project aspect; from my well-structured and commented code, right down to extensive API documentation using Swagger/OpenAPI. My work is widely acknowledged as being easy to onboard and utilizes from this documentation. Lastly, I'm no stranger to tight deadlines and can adeptly navigate a complex CI/CD pipeline while maintaining high test coverage. In fact, I have been often commended for my ability to consistently deliver quality products on schedule. My past performance has been testimony enough of my ability to ensure your REST endpoints not just meet functional specs but are also returning p99 below 150ms under heavy load. Don't just take my word for it - please review my previous work indicating my strong track record of maximizing performance Spring WebFlux applications

@KarthikTechCon

Hi, I'm Karthik, a senior backend architect with 15+ years of experience building high-performance Java, Spring Boot, microservices, and cloud-native applications. I have extensive experience developing and optimizing Spring WebFlux APIs with PostgreSQL, JWT authentication, Redis caching, Docker, Kubernetes, and CI/CD pipelines for high-throughput production environments. ✔ Reactive REST API Development (Spring WebFlux, Java 17+) ✔ PostgreSQL Performance Optimization & Connection Tuning ✔ JWT Authentication & Security Hardening ✔ Redis Caching & Non-Blocking Architecture ✔ Docker & Kubernetes-Ready Deployments ✔ Swagger/OpenAPI Documentation ✔ Unit & Integration Testing (JUnit, Mockito, Testcontainers) ✔ GitHub Workflow & CI/CD Integration My approach focuses on minimizing blocking operations, optimizing database access patterns, implementing reactive streams correctly, and ensuring APIs remain performant under heavy concurrent load. I can help refactor existing endpoints, build new reactive services, improve throughput, and deliver fully documented, tested, production-ready APIs that meet your latency and scalability requirements. Available to start immediately and discuss benchmarks, architecture, and delivery milestones. Best Regards, Karthik

@niteshn15

Hi, I am a Java/Spring Boot developer with experience in REST APIs, databases, authentication, and backend systems. I can deliver clean, maintainable code and am available to start immediately. Looking forward to discussing the project.

@guptakishan805

As an experienced and dedicated technology partner, I understand the gravity of your need. With over 5 years of experience honing my expertise with Java, RESTful API, and Spring Boot, I've built high-performing systems that can handle heavy workloads even in low-latency situations. A great testament to my abilities is evident in my past projects where I optimized the throughput of Spring WebFlux to deliver sub-150ms p99 responses even under intense loads. Moreover, my familiarity with Docker and Kubernetes enables me to create container-ready APIs that are primed for cloud deployment. I've also worked extensively with PostgreSQL and incorporated JWT authentication to secure each API call for user privacy and data integrity—essential facets of any modern solution. Additionally, I employ industry-standard tools like Redis caching and non-blocking patterns to ensure optimal performance. My deep understanding of these tools combined with an innate technical acumen will undoubtedly assist me in creating the high-powered endpoints you require.