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We are an early-stage fintech startup based in Canada (RewardsX Loyalty Platform International Inc.) currently developing a mobile application using Flutter & Dart with a dedicated mobile team based in Chennai, India. We are looking for a reliable and practical Back-end Developer to support our Flutter/Dart team for a one-month contract. This is a part-time support role focused on API development, debugging, and backend integration rather than building a system from scratch. Our application ecosystem includes: Flutter & Dart Mobile App Node.js Backend (existing codebase) MongoDB and PostgreSQL databases MERN-based web modules (React) Google Cloud Platform (GCP) infrastructure The selected developer will work closely with our mobile team to ensure smooth API connectivity, backend stability, and feature support. Scope of Work Support Flutter team with API integration and backend endpoints Work on existing Node.js backend services Debug and fix backend issues impacting mobile app Optimize APIs for performance and scalability Handle database operations (MongoDB & PostgreSQL) Assist with deployment and backend maintenance on GCP Collaborate with a distributed team (Canada + Chennai) This is a support-focused role, not a greenfield build. Technical Requirements (Must Have) Strong experience in Node.js (Express preferred) Experience with MongoDB and PostgreSQL REST API development and integration Basic understanding of Flutter backend requirements Familiarity with Google Cloud Platform (GCP) Experience working with existing codebases Git-based workflow experience Nice to Have: MERN stack experience (React exposure) Startup or fast-paced product experience Experience supporting mobile apps (Flutter/iOS/Android) Work Schedule & Commitment Duration: 1 Month (with potential extension) Work Type: Part-time Hours: 4–5 hours per day Days: Monday to Friday Preferred Overlap: IST / Chennai working hours Daily coordination with the Chennai mobile team will be required. Budget Fixed Budget: $180 CAD for 1 month This is a startup-budget role (please apply only if comfortable with this range) Strong performers may receive contract extension in the following months Who Should Apply Developers comfortable working with startups Freelancers who can deliver practical solutions (not just theory) Developers who can work independently and communicate clearly Candidates available consistently for the full 1-month period To Apply, Please Include Your experience with Node.js and API development Previous projects involving mobile app backend support (Flutter preferred) Experience with MongoDB, PostgreSQL, and GCP Your timezone and daily availability (4–5 hrs) Confirmation that you are comfortable with the listed budget About Us RewardsX is a Canada-based fintech product focused on intelligent credit card rewards optimization and merchant insights. Our mobile app is currently under active development with a distributed engineering team across Canada and India. We are looking for a dependable backend partner who can support our mobile development cycle and grow with us as the product scales.
Project ID: 40241000
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Active 25 days ago
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123 freelancers are bidding on average $144 CAD for this job

I am confident that my expertise in NoSQL Couch & Mongo, Agile Development, Node.js, Express JS, and PostgreSQL align perfectly with the requirements of the project "Expert Full Stack Developer Needed - one month short contract." While the budget is fixed, I am open to discussing adjustments once the full scope is clarified. My priority is to deliver high-quality results within your budget constraints. Please review my 15 years of experience in my profile to see the quality of work I have delivered. I am eager to start and showcase my commitment to this project. Looking forward to further discussion.
$175 CAD in 7 days
5.4
5.4

Hello, I’m excited about the opportunity to support the RewardsX mobile team and help stabilize and optimize your existing Node.js backend during this development phase. With strong experience in Node.js (Express), REST API integration, MongoDB, PostgreSQL, and working with mobile-facing backends, I can assist your Flutter team with endpoint support, debugging integration issues, improving API performance, and ensuring reliable deployments on GCP within your current architecture. I’ve worked on startup environments with distributed teams before, supporting active mobile builds by refining existing codebases rather than rebuilding from scratch, and I’m comfortable collaborating daily with your Chennai team during IST overlap hours. I am available 4–5 hours per day, Monday to Friday, and can commit fully for the 1-month duration; however, I would like to clarify the budget alignment before proceeding, as the listed amount is significantly below standard market rates for this scope. Best regards, Juan
$140 CAD in 1 day
5.1
5.1

Hi, early fintech apps usually struggle when backend APIs are not tightly aligned with mobile requirements. Small integration gaps can block entire Flutter flows. I am a full stack Node.js developer and I can support your existing Express backend and mobile team without disrupting current architecture. I have worked on API layers for mobile apps, handling MongoDB and PostgreSQL operations, optimizing endpoints, fixing integration bugs and supporting deployments on GCP. I am comfortable working inside existing codebases with Git workflows and distributed teams. Timezone: IST Availability: 4 to 5 hours daily, Monday to Friday Comfortable with the stated startup budget for 1 month. Ready to support immediately. Verma
$200 CAD in 7 days
5.3
5.3

With extensive experience in Node.js and REST API development that aligns perfectly with your project’s needs, I bring an array of skills that make me the ideal candidate. I am confident in my abilities to support your Flutter/Dart team - working on existing codebases is one of my fortes. Having previously worked on complex projects involving MongoDB, PostgreSQL, and GCP justifies my capacity to handle your diverse application ecosystem. When it comes to your stated preference for a practical approach rather than theoretical solution provision, you can count on me to deliver the goods. Throughout my career, I have successfully contributed to large-scale projects by debugging, improving backend stability, and optimizing APIs for better performance. Additionally, my timezone and availability are aligned with Chennai working hours which will ensure proper coordination with the mobile team. Lastly, as a developer who values long-term commitments and has a deep understanding of the requirements of working in a starts-up environment, I am more than comfortable with the listed budget. Moreover, my determination to grow alongside your fintech start-up perfectly suits your demand for candidates who can see the big picture like myself. Together we can elevate the RewardsX platform to new heights through effective collaboration and reliable support.
$200 CAD in 3 days
4.8
4.8

Hello, I hope you are doing well. I’m a seasoned Backend/Full Stack developer with strong Node.js (Express), MongoDB, PostgreSQL, REST API design and integration, and a track record of supporting mobile apps and distributed teams. I understand fintech move fast and prioritize robust APIs, clean integration points, and scalable backends that keep Flutter apps responsive. In recent projects I’ve maintained and extended Node.js backends, implemented API endpoints, debugged issues impacting mobile experiences, and optimized queries for MongoDB and PostgreSQL. I’ve worked in parallel with React/MERN modules and deployed on Google Cloud Platform, all while keeping Git-based workflows and CI/CD in sync with a fast-paced team. I can handle this one-month, part-time engagement by aligning with your Chennai team on API integration, backend maintenance, and deployment on GCP. I’ll focus on stability, performance, and clear collaboration with your mobile squad to deliver reliable endpoints and smooth app experiences. Please feel free to contact me so we can discuss more details. I am looking forward to the chance of working together. Best regards, Billy Bryan
$250 CAD in 5 days
4.6
4.6

Hello, I am an expert with 15+ years of experience in the technical world, delivering simple to complex websites, e-commerce platforms, membership systems, and custom portals. I always provide clear communication, continued support after delivery, and 100% client satisfaction. I specialize in Node.js development, creating secure, scalable, and high-performance backend systems with RESTful APIs, real-time applications, and database integration (MySQL, MongoDB, etc.). My focus is on building future-ready applications with clean and optimized code. If you are looking for a dedicated Node.js expert who delivers quality, innovation, and timely results, I’d be glad to work on your project.
$100 CAD in 7 days
5.1
5.1

Hi, I’m a backend developer with strong experience in Node.js (Express), REST API development, and supporting Flutter mobile apps in production environments. I’ve worked on existing codebases to debug API issues, improve performance, and ensure smooth integration between mobile apps and backend services. I’m comfortable working with MongoDB, PostgreSQL, and GCP, including deployment, monitoring, and maintaining backend stability for active products. I’ve supported distributed teams before and can reliably collaborate with your Chennai mobile team during IST overlap hours. I’m available 4–5 hours daily, Monday to Friday, and comfortable with the listed startup budget for this one-month support role, with interest in continuing long-term if needed. Timezone: Flexible with IST overlap Availability: 4–5 hours/day, consistent for full contract duration
$180 CAD in 30 days
4.5
4.5

⭐Hi, I’m ready to assist you right away!⭐ I believe I’d be a great fit for your project since my extensive experience in Node.js, REST API development, and working with MongoDB and PostgreSQL align perfectly with your technical requirements. With a focus on optimizing APIs for performance and scalability, I can ensure smooth API connectivity and backend stability for your application. Additionally, my familiarity with Google Cloud Platform (GCP) infrastructure and experience supporting mobile apps make me well-suited for this role. I look forward to collaborating with your team to enhance your application's backend functionality and performance. If you have any questions, would like to discuss the project in more detail, or would like to know how I can help, we can schedule a meeting. Thank you. Maxim
$30 CAD in 6 days
4.1
4.1

As a seasoned full-stack developer with over six years of experience, my expertise aligns precisely with your project's needs. Throughout my career, I have worked extensively with many of the technologies central to your project, including Node.js, MongoDB, and PostgreSQL. In addition to these skills, my broad knowledge includes Java, C++, Python, PHP, along with frameworks such as Django and Flask. I am also well-versed in both native and hybrid mobile app development (Flutter, React Native), which will be invaluable while supporting your mobile development cycle. Having worked in fast-paced startups before, I understand the importance of delivering results in a limited timeframe without sacrificing quality. Furthermore, I bring with me a unique perspective backed by my diverse geographical background - having offices in Pakistan and the UK - and extensive experience collaborating within distributed engineering teams across borders. This experience strengthens my ability to work independently while ensuring clear communication and timely delivery.
$140 CAD in 2 days
3.8
3.8

Hi, As a full stack developer with deep expertise in Backend Development using Node.js and MongoDB, I believe that I am the perfect fit for your project at RewardsX Loyalty Platform International Inc. In my career, I have handled similar responsibilities, including API development and debugging as well as backend optimization for better mobile performance, all crucial aspects of your project needs. Moreover, my Git-based workflow experience will ensure that integration with your existing codebase is quick and seamless. Having worked on MERN stacks and familiar with Google Cloud Platform (GCP), deploying and maintaining your backend on GCP will be well within my skill set. My experience in working with startup projects has equipped me with a unique problem-solving ability that usually comes in handy when working with limited resources, just as in your case. With a reputation of delivering practical solutions exceeding client expectations, I assure you reliability and commitment throughout the entire duration of this project. I am confident that by combining my technical skills, positive attitude to collaboration across geographies and work ethic tailored around market demand, I can help propel RewardsX to the next level. Warm Regards.
$140 CAD in 7 days
3.8
3.8

Having spent more than 15 years in web development and tackling everything from simple websites to complex e-commerce platforms, I am confident in my skills as a Full Stack Developer to take on such a support-focused role. My extensive experience with Node.js, MongoDB, and PostgreSQL makes me quite familiar with the technologies you're utilizing for your fintech app. I understand that you have an existing codebase and seek support rather than starting from scratch, and this is where my knack for working with existing codebases comes into play. Moreover, my work with REST API development will ensure smooth API connectivity and aid in optimizing APIs for better performance and scalability. The project's demand for collaborating with a distributed team is also something I'm accustomed to - effectively communicating and providing practical solutions are key aspects of my work ethic. Regarding the budget, even though it's a startup budget role, my extensive familiarity with getting projects up and running practically within tight budgets is one of my biggest strengths. While considering applications from others, keep in mind that bringing me onto your team will ensure not just the job done but also an experienced individual committed to go a long way working with your firm as the product scales. Let's shift gears towards success together! Thanks, Jay
$140 CAD in 7 days
4.0
4.0

Hi, I’m excited about the opportunity to support your Flutter/Dart mobile team with backend development for RewardsX. I have strong experience in Node.js (Express), MongoDB, and PostgreSQL, and have supported mobile apps by developing and debugging APIs, optimizing endpoints, and ensuring smooth backend integration. I’m familiar with GCP deployments and can work effectively with distributed teams, coordinating daily with your Chennai developers. I’m comfortable with the budget and part-time schedule, and I’m ready to deliver practical solutions that keep your app stable and scalable. Looking forward for your positive response in the chatbox. Best Regards, Arbaz T
$235 CAD in 7 days
3.7
3.7

Hello, We are Tech Versify, a Full Stack Development company with over 5 years of experience in providing tailored solutions for various projects. We have a team of skilled developers proficient in Node.js, MongoDB, PostgreSQL, REST API development, and Google Cloud Platform (GCP) infrastructure. We have thoroughly reviewed your project requirements for a Back-end Developer to support your Flutter/Dart mobile team in API integration, backend services, and database operations. Our expertise aligns perfectly with the technical requirements outlined in the job description. Let's discuss your project further to understand how we can collaborate effectively. Please start the chat so we can delve into the details and provide a professional solution for your fintech startup's mobile application development needs. Best regards, Tech Versify LLC
$140 CAD in 7 days
3.4
3.4

Warm Greetings! I understand you're looking for a dependable backend developer who can support your Flutter team by strengthening the existing Node.js backend, stabilizing APIs, and ensuring smooth mobile integration throughout the month. I'll approach this by auditing the current backend, fixing bottlenecks immediately, and improving API performance and reliability—while coordinating daily with your team and introducing small-but-impactful optimizations to keep your system stable long after the contract ends. The key tip here: backend stability comes from consistent debugging, clear communication, and proactive fixes—not big rewrites. Looking forward to supporting your team and delivering dependable backend results. Best regards, Muamer Kaukovic
$100 CAD in 7 days
3.4
3.4

hi I have strong experience supporting Node.js (Express) backends for mobile apps, working with MongoDB + PostgreSQL, optimizing REST APIs, fixing production bugs, and maintaining services on GCP within existing codebases. I’ve supported Flutter teams by stabilizing endpoints, improving query performance, handling auth/session flows, and ensuring smooth API–mobile integration in fast-moving startup environments. I’m available 4–5 hours daily aligned with IST (Chennai overlap), comfortable with Git workflows and distributed collaboration, and I confirm I’m okay with the listed $180 CAD budget for the 1-month support contract. Best regards, Stefan
$100 CAD in 7 days
3.2
3.2

Hello! Expert is HERE!!! After reviewing your project, I've found that AngularJS, Node.js, Express JS, NoSQL Couch & Mongo, MongoDB, Microservices, PostgreSQL, REST API, Full Stack Development and Agile Development are my key skills. I have the expertise required for your project and am confident I can successfully complete it. With 10 years of strong experience, I will meet deadlines and deliver a flawless result. I would like to discuss your project in detail. Please feel free to contact me anytime. Thank you, Moh A.
$120 CAD in 3 days
2.5
2.5

Hi there, I can provide dependable backend support for your RewardsX Flutter/Dart mobile app. I have strong Node.js (Express), MongoDB, PostgreSQL, REST API, and GCP experience, with a focus on supporting existing mobile applications. I’ve previously assisted Flutter teams with smooth API integration, backend debugging, database operations, and cloud deployment. For this role, I’ll: Support API integration & debugging to ensure seamless mobile-backend communication. Manage MongoDB/PostgreSQL operations, optimizing queries for performance. Assist with GCP deployment and maintenance, ensuring uptime and scalability. Collaborate daily with your Chennai team via Git workflows, providing clear updates. I’ve worked on startup projects maintaining mobile backends under fast-paced requirements, delivering practical solutions, not just theory. I’m available 4–5 hours/day, Monday–Friday, aligned with IST/Chennai hours, and comfortable with the $180 CAD budget for this month. Previous projects include Flutter-integrated mobile apps with backend API support, cloud hosting, and real-time data sync. I write clean, maintainable code, provide thorough testing, and maintain prompt communication—ideal for distributed teams. I’m ready to start immediately, ensuring your backend is stable, responsive, and fully supportive of ongoing mobile development.
$180 CAD in 7 days
2.6
2.6

Hello, I am a full-stack developer with 8 years of rich experience in software development, with Node.js (Express), REST API design, MongoDB, PostgreSQL, MERN modules, and GCP deployments supporting mobile applications. I would work directly with your Chennai Flutter team to stabilize and optimize the existing Node.js services, review and refactor critical endpoints, improve query performance in MongoDB/PostgreSQL, and ensure clean API contracts so mobile integration remains smooth and predictable. I have supported Flutter and React-based products before, handling debugging, production fixes, and GCP deployments within active startup environments. Timezone: I can overlap with IST for 4–5 hours daily (Monday–Friday) and maintain consistent coordination. I am comfortable with the listed $180 CAD fixed budget for the 1-month support role. This project is a perfect fit for my skills and I am sure I can delivery this with high quality. Thanks for considering my proposal, — Lautaro
$250 CAD in 1 day
2.6
2.6

As an adept Full Stack Developer with a specialization in Web, Mobile, and AI/ML solutions, I'm confident that I possess the precise skillset you're in search of. My notable experience with concepts akin to your project's is bolstered by my extensive knowledge of: - Full Stack Web Development: With expertise in React, Vue, Angular, Node.js, Django and Flask combined with databases like MongoDB, MySQL and PostgreSQL, I've constructed secure and scalable web apps that signify excellent results. - Mobile App Development: The mobile team at Chennai can rely on my comprehensive knowledge of Flutter & React Native for developing cross-platform and contextual mobile apps. Moreover, being proficient at differentiating between delivering high performance and user-friendly apps based on Swift & Kotlin for native development, I stand ready to optimize your app ecosystem. - AI/ML & LLM Integration: For intelligent prompts or LLM integration (that seems perfectly suited for your fintech product), I feel that my know-how in NLP, TensorFlow, scikit-learn and more could significantly enhance your RewardX app's functionality. My past associations have seen me working seamlessly with distributed teams across continents facilitating agile execution of projects as well as smooth communications. My punctuality in coordinating daily overlaps resonates perfectly with the work hours you require.
$140 CAD in 7 days
2.4
2.4

Hello!!! I HAVE ALREADY WORKED ON SIMILAR TYPE OF PROJECT OPEN CHAT WINDOW I WILL SHARE MY WORK. I have a couple of questions: 1. Are there any critical backend modules or APIs that need priority debugging or integration during this 1-month period? 2. Should I focus solely on Flutter mobile support, or also assist with MERN web modules and GCP deployment tasks? What I offer: ⭐ API development and integration with Node.js backend ⭐ Support for Flutter mobile app backend connectivity ⭐ Debugging and fixing backend issues for MongoDB and PostgreSQL ⭐ Optimizing API performance and scalability ⭐ Deployment assistance and maintenance on Google Cloud Platform ⭐ Collaboration with distributed teams and Git workflow management I bring 7+ years of experience in full-stack development, Node.js backends, and supporting mobile applications in startup environments. My approach: 1. Review existing codebase and identify key backend endpoints for Flutter support 2. Debug, optimize, and integrate APIs efficiently 3. Provide daily updates and coordinate closely with the Chennai mobile team Looking forward to connecting and discussing how I can support your team. Best Regards, Shaiwan Sheikh
$119 CAD in 7 days
2.5
2.5

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