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Our platform already supports 90,000 active users, and the next growth phase calls for fresh features across the website, both mobile apps, and the underlying Spring-based AWS backend. You will be pairing with a senior engineer, taking well-defined user stories from ticket to production and touching every layer as needed—from a responsive HTML/JavaScript tweak to an Aurora-optimised query or an in-app purchase flow. Core stack you’ll encounter • Website: HTML, JavaScript, CSS • iOS: Objective-C, Swift • Android: Java • Backend: Spring Framework, Java, AWS (S3, SES, MSK, CloudFront, EC2 autoscaling, Aurora) • Payments: Stripe, [login to view URL] • Source & CI/CD: GitHub Typical workflow 1. Pull the ticket, discuss approach with the senior engineer. 2. Code the change, write/extend tests, open a GitHub PR. 3. Verify in staging, roll out via our existing CI/CD pipeline. Acceptance criteria for every story • Clean, well-commented code merged to the main branch. • Unit and integration tests passing in CI. • No regression on mobile or web performance budgets. Scheduling is flexible; steady progress is more important than strict hours. When replying, focus on relevant experience you have with any part of the stack above and highlight projects where you shipped production code at comparable scale.
Project ID: 40404912
150 proposals
Active 14 days ago
Location: United States
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150 freelancers are bidding on average $49 USD/hour for this job

A Warm Hello! We are readily available to start working on this project! We are a small, senior-led engineering team experienced in shipping production-grade features across web, mobile, and cloud backends. We’re comfortable integrating into existing teams, collaborating asynchronously, and taking ownership of tickets from discussion through deployment. We’re comfortable operating across your entire stack and integrating seamlessly with your existing engineering process. If you’re looking for a reliable team that can ship production-ready features without introducing risk, we’d be glad to collaborate. Let us know the next steps—we’re ready to get started. Best regards, Ana
$40 USD in 40 days
10.0
10.0

With over a decade of experience in full-stack architecture and high-scale systems, I understand the need to enhance your popular platform to support the next phase of growth with fresh features across the website, mobile apps, and Spring-based AWS backend. My background in scaling systems for over 1 million users and expertise in high-security FinTech align perfectly with the challenges your project presents. For strategic insight, I recommend implementing strict CI/CD practices to ensure smooth deployments and scalability. In a past project, I successfully built and scaled a Telegram Mini App serving over 1 million users, showcasing my ability to handle projects at this level of complexity. I encourage you to reach out so we can discuss the roadmap for enhancing your platform. Let's collaborate to bring your vision to life and further elevate your user experience.
$52 USD in 15 days
8.9
8.9

Hi, This is Elias from Miami. I checked your project description and understand you’re looking to enhance your platform with new features to support your growing user base of 90,000. It sounds like an exciting opportunity to improve user engagement and functionality. I’ve worked on several similar platforms and understand the key technical challenges involved in scaling and implementing new features. I’d be happy to go through the details and suggest the best technical approach. To ensure I fully understand your needs, I have a few questions for clarification: Q1 – What specific features are you looking to add to the platform? Q2 – Are there any existing integrations or systems that the new features need to work with? Q3 – How do you envision user roles and permissions being structured for these enhancements? Looking forward to hearing from you.
$50 USD in 10 days
8.5
8.5

Good to see this project, I will pick up user stories across your full stack — responsive web fixes, iOS/Android feature work, and Spring/Aurora backend tasks — and ship each through PR review to production via your CI/CD pipeline. One thing I will prioritize: Aurora query plans on every database change, since at 90K active users a missing index or unoptimized join hits hard under autoscaling load spikes. Questions: 1) Are the iOS modules primarily Swift or still heavily Objective-C? 2) Do you use feature flags for staged rollouts? Looking forward to potentially working together. Thanks, Kamran
$49 USD in 40 days
8.5
8.5

Hello, Your platform's impressive 90,000 user base and ambitious growth phase, requiring new features across web, mobile, and your Spring/AWS backend, immediately caught my attention. I am eager to contribute across the full stack, from responsive UI to optimized backend queries and payment flows, working collaboratively with your senior engineer. I’m Waqas from Eclairios, a professional software engineer with over 7 years of experience in app and web development. I have successfully completed 128 projects, earning a 5.0 rating from satisfied clients. I specialize in mobile apps (Android, iOS, Flutter), website development, custom APIs, and backend solutions. My goal is to deliver high-quality, scalable solutions that meet your business needs. Why hire me? ★ 100+ Projects Completed with 5-star rating. ★ 3 months of free post-launch support ★ Expertise in advanced technologies and systems Let’s connect and discuss how I can help you with your project. Best regards, Waqas
$47 USD in 40 days
8.4
8.4

I can happy to do demo work for a week if you happy then only you hire me.I will be also happy to jump for a quick interview, I have been working with the big brands, currently working the complex web and app based platform for the south African client. Looking forward to add value for your work Thanks
$53 USD in 40 days
8.4
8.4

I am a seasoned full-stack developer with extensive experience in building and enhancing platforms at scale. I have expertise in both frontend and backend technologies, including HTML, JavaScript, CSS, and the Spring Framework leveraged on AWS infrastructure. My background includes optimizing queries with Aurora and integrating payment gateways such as Stripe, aligning well with your project's stack. In my previous roles, I have consistently delivered well-structured, clean code and have successfully coordinated with senior engineers to take user stories from ticket to production. My experience with CI/CD pipelines, including GitHub-based workflows, ensures that I am well-prepared to contribute to your platform's next phase of growth. I've worked on projects involving more than 100,000 users, demonstrating my ability to handle large-scale systems effectively. I am interested in discussing this opportunity further and exploring how I can contribute to your platform's success. Please let me know a convenient time for us to connect or if you need additional details about my experience.
$40 USD in 40 days
8.2
8.2

Hi, To enhance your platform with fresh features, I'll collaborate closely with your senior engineer to implement user stories effectively. This will include: - Implementing responsive HTML/JavaScript tweaks. - Optimizing Aurora queries for better performance. - Developing in-app purchase flows. - Ensuring clean, well-commented code with thorough testing. I will follow a structured approach, starting with discussions on the ticket, coding the changes, and verifying in staging before rolling out via your CI/CD pipeline. Ready to start once you provide access to the necessary resources. Thanks!
$53 USD in 40 days
8.2
8.2

At your scale, the real challenge isn’t adding features—it’s shipping them safely across web, iOS, Android, and a live Spring/AWS backend without slowing users or breaking flows. I’d work ticket-by-ticket with your senior engineer, aligning early on edge cases (data consistency, mobile parity, payment states). Changes stay minimal and targeted—whether it’s a UI tweak or an Aurora query—backed by tests that protect existing behavior. I’m careful with rollout impact (API contracts, caching, async flows via MSK) so nothing regresses under load. One small improvement I’d add: tighter monitoring hooks around new features to catch performance drift post-deploy. Relevant experience: built and shipped SaaS features on Vue/Nuxt + Express (Bubbl), handling real-time updates and production stability at scale. Happy to integrate directly into your workflow and start closing tickets cleanly. Q1: How strict are your mobile/web performance budgets currently enforced in CI? Q2: Any recurring regression areas (payments, sync, notifications)? Q3: How coupled are mobile releases to backend changes today?
$40 USD in 40 days
6.9
6.9

Hello, I’d be glad to help enhance your platform as you grow past 90,000 active users. I’ve worked across similar stacks, from front-end HTML and JavaScript updates to mobile code in Swift and Java, and backend work with Spring on AWS. I’m comfortable shipping production-ready features with clean code, solid tests, and smooth CI/CD rollouts, and collaborating closely with senior engineers fits my usual workflow well. Thanks, Teo
$200 USD in 2 days
6.8
6.8

Hello! As per your project post, you are looking to enhance a high scale full stack platform with 90,000 active users by adding new features across the website, iOS app, Android app, and a Spring based AWS backend. The goal is to continuously evolve the product through well defined user stories, improving performance, user experience, and system reliability while working closely with a senior engineer in an established production environment. My focus will be on delivering end to end feature enhancements, featuring: frontend updates using HTML, JavaScript, and CSS for responsive web improvements, mobile app enhancements for both iOS using Swift Objective C and Android using Java, backend development using Spring Framework with optimized AWS services including S3 SES MSK EC2 autoscaling and Aurora, payment flow improvements using Stripe and Authorize net, and proper CI CD based deployment through GitHub workflows. I specialize in full stack development across scalable distributed systems with strong experience in Java Spring ecosystems, mobile app development, and cloud based AWS architectures. My focus will be on building reliable and efficient features that integrate smoothly into existing large scale systems without disrupting live users. Let’s connect to understand your current roadmap, priority tickets, and performance goals so we can align on execution and delivery strategy. Best regards, Nikita Gupta.
$40 USD in 40 days
6.8
6.8

Hello, As a senior full stack software engineer, I specialise in building scalable platforms and cross-platform mobile apps using Java, JavaScript, CSS, HTML5, and Swift. I have a deep understanding of modern UI, cloud backends, and end-to-end development, ensuring both performance and reliability. Some Questions: Could you share more about the app’s main audience and core features? Are there existing wireframes or UI designs ready to review? Is the deployment targeted for both iOS and Android simultaneously? Would integration with existing backend systems be needed? I am eager to help bring your vision to life. Let us connect to discuss details further.
$40 USD in 40 days
6.7
6.7

I can step in and contribute across your full stack while keeping pace with an established production workflow. I’ve worked on scalable applications where features span frontend, mobile, and backend services, so I’m comfortable moving between Java/Spring APIs, database optimisation, and UI updates. On the backend, I’ve built and refined REST services, improved query performance (including relational databases like Aurora/MySQL), and integrated third-party services like Stripe. On the frontend, I handle responsive HTML/CSS/JS updates with performance in mind. While I’m strongest on backend and web, I’ve also collaborated on mobile features (Swift/Java environments), especially where API integration, payments, or shared business logic are involved. I’m used to structured workflows—picking tickets, aligning on approach, writing clean, testable code, and shipping through CI/CD pipelines on GitHub. Performance and stability are always priorities, especially in systems with active user bases. I can integrate smoothly with your senior engineer, contribute consistently, and deliver production-ready features without introducing regressions. Ready to get started and push code.
$40 USD in 40 days
6.5
6.5

I’ve worked closely with senior engineers to deliver features across web, mobile, and backend layers in scalable environments supporting tens of thousands of users. For example, I helped enhance a SaaS platform with a similar Spring and AWS backend, where I optimized Aurora queries and improved in-app purchase flows using Stripe. I’m comfortable handling user stories end-to-end—coding, testing, and deploying through CI/CD pipelines—as described. To streamline collaboration: do you use feature flags or blue/green deployments for staged rollouts? Also, is there a preferred approach for profiling and preventing regressions in mobile performance? I’m ready to jump in on your tickets, pair on design, and deliver well-tested code that meets your acceptance criteria and keeps your platform running smoothly at scale. Let’s get started.
$52.50 USD in 7 days
6.1
6.1

Hi there. As a seasoned developer, I am ready to work for your task well. I can start to work now. Waiting your response. Best regards.
$55 USD in 40 days
6.6
6.6

As a Full Stack Developer with a specialization in JavaScript and Mobile App Development, I'm excited about the opportunity to contribute to your platform's enhancement. Over the years, I've honed my skills working on similar projects, stretching across different layers of web and app development like responsive HTML tweaks, app purchase flows, and Aurora-optimized queries. My familiarity with the core stack listed, including languages like Objective-C, Swift, Java, and technologies like AWS and Stripe, mirrors what you're looking for. One aspect where I take pride as a developer is writing clean code – it's not just about functionality but also maintainability. Your acceptance criteria about well-commented code merged into the main branch resonate with my coding values. More so, I can assure you of seamless integration between the front-end and back-end layers leveraging RESTful APIs efficiently. What sets me apart is my experience in working at scale that's comparable to your 90,000 active users. The ability to tame complexity while maintaining clear communication lines often proves invaluable in projects like this. Going beyond just executing ticketed tasks, my approach involves aligning with your business goals and planning for scalability. To sum up, I am a technically competent professional with an empathetic understanding of business needs. If given an opportunity, I will ensure that progress is consistent and your demands are met – scheduled or not.
$60 USD in 40 days
6.4
6.4

⭐⭐⭐⭐⭐With great pleasure, I am proposing my services to enhance your popular platform. Throughout my illustrious 10+ year career, I have been building AI-powered systems and automation workflows - just the type of skills you're looking for in order to take your 90,000 active user platform to the next level. Be it HTML/JavaScript tweaks, Spring-based AWS backend optimization or mobile app development with iOS and Android platforms, they are all well within my arena. Another crucial aspect of working with me is that I prioritize steady progress over strict hours when it comes to scheduling. This aligns well with your workflow as you've mentioned that consistent progress is paramount. Moreover, my experience in technologies like Stripe and AWS aligns directly with your project requirements. I can also bring in value through my proficiency with GitHub for source control and CI/CD.
$53 USD in 40 days
6.1
6.1

Hi, I will help extend your platform across web, mobile and Spring AWS backend while keeping production stability intact. You have 90k users and strict CI/CD requirements; I have 7+ years full stack experience delivering production systems with APIs, integrations and performance tuning. I work ticket by ticket with senior engineers, writing tests, PRs and ensuring no regression across web and mobile performance budgets. Which area should we tackle first: backend, mobile or web? Best Regards, Fizza Nadeem K
$53 USD in 40 days
5.7
5.7

⭐⭐⭐⭐⭐ ✅Hi there, hope you are doing well! I have extensive experience working on full-stack enhancements for high-traffic platforms, efficiently shipping production features across web, iOS, Android, and Spring-based backend stacks similar to your project. The most important part to successfully complete this project is seamless coordination between front-end, mobile, and backend layers coupled with clean, well-tested code. Approach: ⭕ Review and understand user stories with the senior engineer to ensure clarity. ⭕ Implement feature changes across HTML/CSS/JavaScript, mobile apps (Swift, Objective-C, Java), and Spring/AWS backend. ⭕ Write comprehensive unit and integration tests to maintain code quality. ⭕ Verify each feature against performance budgets and deploy through CI/CD pipelines. ❓Could you clarify the priority of features to tackle first and any existing bottlenecks? I am confident my background in full-stack development and scalable AWS architectures will add real value to your platform's growth phase. Looking forward to collaborating and delivering quality enhancements. Best regards, Nam
$40 USD in 28 days
5.2
5.2

Hello!, This is James from Hollywood. I’ve carefully read your project description about enhancing your platform, which already supports a remarkable 90,000 active users. It’s exciting to think about implementing fresh features to propel your next growth phase! With about 15 years of experience in full-stack development, including Java, JavaScript, and mobile app development, I am confident I can deliver the perfect solution tailored to your needs. To help me better understand the project, could you please clarify the following questions? 1. What specific features are you looking to implement in this growth phase? 2. Are there any current challenges you're facing with the existing platform that I should be aware of? My approach combines technical expertise with a keen business mindset, ensuring that solutions are both effective and practical. I suggest we start with a detailed analysis of your current system, followed by phased feature development to ensure smooth integration and user satisfaction. In my past work, I’ve successfully built and enhanced platforms similar to yours, focusing on user experience and performance. I am committed to clear communication and delivering production-ready code, ensuring your project is in capable hands. Looking forward to discussing this further!
$50 USD in 10 days
5.3
5.3

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