Senior Full-Stack Developer for Intensive Contract

@mak94pk

To ensure scalable backend microservices, I would start by designing a high-performance database schema in MySQL, focusing on query optimization. Delivery is expected within 30 days. Will the team be using an existing codebase or starting from scratch?

@vishal1145

Your React Native migration will fail if the state management layer isn't architected to handle offline-first sync and real-time matching updates at scale. Without proper Redux middleware and optimistic UI patterns, you'll see race conditions that corrupt user data during high-concurrency scenarios. Quick questions - what's your current MySQL query response time under 10K concurrent connections, and have you load-tested your JWT refresh token strategy against token expiration storms during peak traffic? Here is the architectural approach: - JAVA 17 + SPRING BOOT: Refactor monolithic endpoints into domain-driven microservices with circuit breakers to prevent cascading failures during KYC pipeline bottlenecks. - REACT NATIVE + REDUX: Build a normalized state tree with Redux Toolkit and RTK Query to eliminate prop-drilling across 50+ components while caching API responses client-side. - AWS EC2 + DEVOPS: Configure auto-scaling groups with CloudWatch alarms tied to CPU thresholds and deploy blue-green pipelines via Jenkins to achieve zero-downtime releases. I've led 3 fintech teams building platforms that scaled from 0 to 2M users without breaking under load. Let's schedule a 30-minute architecture review call before you commit to the build timeline.

@sparkbrains

Hi, I can lead the Phase 1 & 2 technical delivery with a strong focus on scalable, production-grade architecture for a millions-user platform. Java 17, Spring Boot, Microservices & REST APIs MySQL optimization, indexing & complex queries JWT, KYC pipelines & real-time matching React Native with Redux/Zustand AWS EC2/IAM, Jenkins CI/CD & SonarQube JUnit/Mockito, code reviews & independent debugging Architecture guidance and mentorship for the development team I’ll first review the current architecture, identify scalability risks, establish coding standards, guide implementation, and review critical features before production. Similar technology references: Spring Boot | AWS EC2 | React Native Available for a 1-month contract. Warm regards, Manu The price will be given after the final discussion!

@ParasTech7

I’m a Principal-level software engineer with 21+ years of experience architecting and delivering production-grade, scalable systems. Your stack aligns closely with my expertise: Java 17, Spring Boot, microservices, MySQL, JWT security, AWS EC2/IAM, REST APIs, React/React Native, CI/CD, and distributed systems**. I can lead Phase 1 & 2 end-to-end—owning architecture, backend implementation/reviews, database optimization, AWS infrastructure, complex matching/KYC workflows, and mentoring the backend engineer and frontend team. My focus is **clean code, scalability, reliability, performance, and independent debugging**, particularly for systems that need to support millions of users. I personally handle architecture and critical implementation rather than relying on AI-generated core logic. We can discuss further.

@irisinformatics

Hi, I have 8+ years of experience in full-stack development and can lead the architecture and technical delivery of both Phase 1 and Phase 2. I’m experienced in scalable backend APIs, database optimization, system architecture, and React Native development. I focus on clean, production-grade code, performance, security, and building systems that can scale to millions of users. I can also guide backend engineers and frontend developers while independently troubleshooting complex technical issues. Thanks, Manish Giri

@abhishek060

Hi, I can take ownership of the Phase 1 & Phase 2 technical delivery, including Java 17/Spring Boot backend architecture, MySQL optimization, JWT security, microservices, AWS EC2/IAM, and React Native architecture oversight. I can also provide code reviews, mentor the backend engineer and frontend interns, and lead complex areas such as real-time matching, KYC workflows, and scalable API design. My approach would focus on clean production-grade architecture, database performance, testing with JUnit/Mockito, SonarQube, and reliable CI/CD through Jenkins. I’m available for the 1-month contractual engagement and can start immediately. Please share the current architecture/repository and Phase 1 & 2 requirements so we can discuss the technical scope and next steps.

@Zaiyan

I can lead the technical delivery of your React Native mobile application, ensuring that the backend APIs scale effectively. My first step will be to assess your current architecture and identify optimization opportunities for the microservices. Based in Toronto, Canada, I work efficiently and maintain open lines of communication throughout the project. Looking forward to discussing this further.

@Web1devloper

With a robust career spanning 8+ years diving deep into Full Stack and Mobile app development, I've garnered a reputation for shipping production-grade systems with technical excellence. I'm not just experienced; I'm highly proficient in Java 17 (Spring Boot) applauded for my deep understanding of relational database optimization using MySQL and setting up sturdy microservices. Having strong practical knowledge of React Native, Redux, and Zustand, I can provide invaluable guidance to your team's frontend strategy. My real value lies in the quality of the work I produce. Unlike developers who rely on AI generation tools, I take pride in crafting clean, scalable, and production-grade code from scratch. Your project's scalability needs don't intimidate me; instead, they excite me! It drives my passion for tackling complex features like user-matching logic and secure KYC verification pipelines while keeping a sharp eye on costs and performance. Furthermore, my experience in configuring and managing production infrastructure on AWS (EC2 and IAM) makes me adept at mitigating potential operational issues before they snowball. In me, you'll find not just a developer but an independent problem-solver with exceptional debugging skills—a professional determined to deliver extraordinary results for you. Look no further: bring me onboard as your Senior Full-Stack Developer, and together we'll create a platform that sustains millions of thriving users.

@jagratip3

Hello, I’m a senior full-stack engineer with strong experience in Java 17, Spring Boot, MySQL optimization, microservices, AWS, React Native, and production-grade system architecture. I’m comfortable taking technical ownership rather than simply completing assigned tickets. For your Phase 1 and Phase 2, I can lead architecture, review backend implementation, guide the frontend team, establish coding/testing standards, and independently troubleshoot complex production issues. My approach focuses on scalability, database performance, secure APIs, clean service boundaries, observability, automated testing, and reliable CI/CD. I can also design the real-time matching and KYC workflows with security and future scale in mind. I’m comfortable mentoring engineers and interns while maintaining strict code-review and quality standards. I write and understand the core implementation myself and use engineering judgment rather than blindly depending on AI-generated code. Availability: Full-time for the 1-month contract Start: Immediate I’d be glad to discuss the existing architecture, Phase 1/2 roadmap, and technical challenges before starting.

@bilal4240

I will lead the full-stack architecture for Phase 1 and 2, delivering scalable Java 17/Spring Boot backend microservices and guiding your frontend team on React Native migrations. I'll optimize your MySQL databases, manage secure AWS infrastructure with Jenkins CI/CD, and personally write clean, production-grade code to ensure successful project delivery within your 1-month timeline. Regards, Bilal

@gauravl3

As an experienced full-stack developer specializing in building scalable, high-performance software solutions, I bring a unique blend of skills, expertise, and a proven track record that makes me well-suited for your Senior Full-Stack Developer role. I understand the paramount importance of producing clean, scalable, production-grade code from scratch without relying on AI generation tools - which perfectly aligns with your core requirements for this project. My 3+ years of experience have solidified my skills in Java, MySQL database optimization, and Spring Boot microservices set-up; all of which are crucial components for your offering. Not only do I have the technological proficiency you're looking for, but I also have the leadership capabilities and dedication necessary to guide and mentor a team effectively. Overseeing a backend engineer and four frontend interns to ensure clean React Native structures and modular scalability is well within my repertoire. With proactive code reviews, architectural support, and a keen problem-solving acumen, I can ensure that we meet every technical demand with strategic efficiency. Furthermore, as someone who has extensively worked with AWS infrastructure similar to what you use (including EC2 and IAM), I'm well-prepared to hit the ground running in terms of setting up and optimizing your production environment.

@KarthikTechCon

Senior Full-Stack Developer: With 15+ years of experience, I specialize in building scalable systems and leading technical teams. I will ensure your platform is architected for success, capable of supporting millions of users. Execution Strategy: - Lead the architecture for backend microservices using Java 17 (Spring Boot), ensuring clean and modular React Native frontend implementation. - Provide high-level mentorship and code reviews for the Backend Engineer and 4 Frontend Interns, enforcing enterprise best practices. - Design complex features like real-time user-matching and secure KYC verification, optimizing for performance and cost. Key Deliverables: - Robust backend APIs and microservices tailored for scalability. - Optimized relational database design using MySQL for high transaction volumes. - Comprehensive documentation and code reviews to maintain quality standards. Quality & Performance: - Ensure production-grade code with rigorous testing using JUnit and Mockito. - Implement CI/CD pipelines with Jenkins for seamless deployment and updates. Timeline & Next Steps: - Initial phase delivery within 2 weeks, with ongoing support for the remaining project duration. - Regular updates and documentation at each milestone. Best Regards, Karthik B Resonite Tech

@jaroslavcaprata

This role is clearly more than hands-on feature delivery—you need someone who can own architecture, review backend decisions, keep the React Native migration structured, and prevent short-term implementation choices from becoming scaling problems later. My strongest background is in full-stack systems, backend APIs, React-based applications, databases, AWS deployment and production architecture. I’m comfortable working at the architecture/code-review level, breaking large features into clear service boundaries, reviewing data models and API contracts, and guiding less-experienced developers without becoming a bottleneck. For Phase 1 and 2, I would focus first on service boundaries, database access patterns, authentication, CI/CD standards and observability. Features such as real-time matching and KYC should be designed around measurable load, failure cases and idempotent workflows rather than only the happy path. On the frontend, I would enforce a clean React Native module/state structure so the intern team can work independently without introducing inconsistent patterns. I also understand your requirement that core engineering decisions and logic must be produced and understood independently rather than delegated to AI-generated code. Before discussing the one-month commitment, how much of the Java/Spring Boot backend already exists, and are you looking for the lead to actively implement Java services or primarily own architecture, reviews and technical sign-off?

@rishi9343

With my 8+ years of experience in mobile app development and an extensive backend service and database optimization expertise, I am confident that I am the highly seasoned Senior Full-Stack Developer you are looking for to drive your project's success. My skills span a wide range from React Native to Java, MySQL, and more. I have demonstrated repeated success in designing, building, and scaling production-grade systems with clean and modular architecture - precisely what your project mandates. As a freelancer who has specialized in turning ideas into reliable and highly scalable applications for companies like yours, your project aligns perfectly with my core strengths. Notably, I have hands-on experience in AWS and managing production infrastructure like EC2 and IAM, a skillset that is vital for ensuring efficient system performance at scale.

@ammarahmed20

With over 3 years of professional full-stack development experience under my belt, including working on similar projects that handle massive user bases, I believe I am the ideal candidate for your Senior Full-Stack Developer role. I write clean, scalable, and production-grade code from scratch that can handle complex user-matching logic, KYC verification pipelines, and AI wrapper integrations. My deep understanding of Java 17 (Spring Boot) and relational database optimization using MySQL will give you peace of mind knowing that your backend is in capable hands. Furthermore, I bring a strong practical and structural understanding of React Native for successfully guiding frontend strategies. Combined with my experience configuring and managing AWS infrastructure, your project will be equipped to handle any scale necessary. Unlike developers who heavily rely on AI generation tools for coding, I offer you complete independence. This means I'm self-reliant in all aspects of writing, testing, and optimizing code without compromising quality or performance. As your Senior Full-Stack Developer, I guarantee not only to fulfill the core responsibilities expected but also provide high-quality mentorship to your Backend Engineer and Frontend Interns. My goal is not just to meet deadlines but exceeding expectations consistently.

@sonika1419

**DO NOT PAY ME UNTIL I COMPLETE! :)** Hello my valuable client :) I can definitely work on your working hours. My profile is new over here but I have 7 years of experience in this field. I have completely understood about your project. Also I will provide you free maintenance on your project for 1 year after project completion. Give me one chance to prove myself. Hit the chat button to get started. If you will not like my work then you dont need to pay me any money so dont worry and have faith in me :) I am eagerly waiting for your message.

@guptakishan805

With my 5+ years as a Full-Stack Developer, I've garnered the experience you seek to drive the successful delivery of your phases. I can serve as your lead architect, bringing deep expertise in Java 17 and Spring Boot to efficiently build backend microservices that scale flawlessly. I'm also well-versed in relational database optimization using MySQL and have hands-on experience configuring and managing production infrastructure on AWS — EC2 and IAM. Your project is focused on writing clean, scalable, production-grade code from scratch, which plays right into my strengths as an independent coder who relies on his skills rather than AI generation tools. Throughout my career, I have shipped several production-grade systems and recognize the significance of clean code. My commitment to writing reliable code that's easily integrated, shared, and understood will be a valuable asset for your team. Lastly, beyond the technical aspects, I believe in long-term relationships through quality work, transparency, and dependable support. I appreciate how your team values their members and believe that aligns perfectly with my principles of inclusivity and fairness. Therefore, if chosen for this pivotal role at CrewBhook for your current project, I'll gladly offer a diligent commitment to ensuring a successful engagement with a sharp focus on delivering solutions that are practical, scalable, and built for long-term success.

@saiqasheikhwork5

As an experienced Senior Full-Stack Developer, I am well-equipped to lead the high-stakes technical delivery of your project's Phase 1 and 2. With a deep understanding of Java 17 (Spring Boot), clean API implementation, backend architecture, and frontend proficiency in React Native (Redux/Zustand), I offer a holistic skill set that aligns perfectly with your project needs. Importantly, I prioritize crafting robust, scalable systems entirely from scratch — no AI shortcuts — something that I believe is absolutely essential for a platform designed to accommodate millions of users. Beyond my skillset, my approach combines technical expertise with a user-centric mindset. Having successfully completed diverse projects like mobile apps, web platforms, SaaS products, and real-time systems, I understand the transformative power of clean, scalable code from design to deployment. Moreover, my unmatched debugging skills and self-reliance ensure the ability to tackle any complex distributed system independently. In addition to servicing the technical aspect of your project, I believe in fostering a supportive work environment. Your menstrual policy - reflecting your attention to gender inclusivity - resonates deeply with me as a woman in tech. This signifies that we share core values and can build strong partnerships. I see this role as an exciting journey where my complete skillet meets the unique demands of your projet. Let's commence this transformative experience together!

@tyronet2

You need a senior full-stack engineer who can own architecture decisions, guide backend and frontend teams, and ensure the platform is built for large-scale production usage. I can provide technical leadership across Java backend, React Native, AWS, and system design. I have 9+ years of full-stack experience building production systems across Korea, Philippines, and the US. My background includes Java Spring Boot, React Native, AWS infrastructure, database optimization, API design, and distributed application workflows. At Poundit, I worked on large e-commerce systems with backend services, payment workflows, and scalable data handling. I can support your Java 17 Spring Boot architecture, review APIs, guide React Native implementation, improve database performance, and help structure CI/CD, testing, security, and deployment practices. I can work closely with your backend engineer and frontend interns through architecture reviews, debugging, and implementation guidance while keeping the codebase maintainable. Can you share the current Phase 1/Phase 2 architecture and the main scalability challenges you are facing?