Full-Stack Developer for Scalable App

@diektech

Hi — Elias here from Miami. This sounds like a great fit. Since the platform combines deterministic calculations with AI guidance, the architecture is critical. I’d keep the calculation engine separate from the AI layer so every result remains consistent, auditable, and explainable, while the conversational assistant focuses on interpreting results rather than generating them. I’d recommend PostgreSQL, NestJS, and React with a modular API-first architecture. This provides a scalable foundation with secure authentication, role-based access, clean database design, and cloud-ready deployment. AI services can then be integrated without affecting the core business logic. I have experience building full-stack SaaS platforms, AI integrations, PostgreSQL, Node.js/NestJS, React, REST APIs, authentication, and cloud deployments. My approach emphasizes maintainable code, automated testing, and documentation to support long-term growth. Q1 – Will the AI use OpenAI/Claude APIs, or do you plan to host your own models? Q2 – Is the calculation engine already specified, or will it be designed as part of this project? Q3 – Do you expect the platform to support multiple organizations (multi-tenant) from the start? Looking forward to hearing from you.

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in SQL, Cloud Computing, NoSQL Couch & Mongo, Node.js, Express JS, PostgreSQL, AngularJS, Full Stack Development, Vue.js, Angular and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.    Best regards, Sales department Tangram Canada Inc.     

@corpmember29

HELLO, I HAVE CAREFULLY REVIEWED YOUR REQUIREMENTS AND UNDERSTAND THAT YOU ARE LOOKING FOR A FULL-STACK DEVELOPER TO BUILD A SCALABLE AI-POWERED DECISION SUPPORT PLATFORM WITH A STRONG ARCHITECTURE. I have 8+ years of experience in full-stack development, Node.js, NestJS, PostgreSQL, modern frontend frameworks, cloud deployment, and building scalable web applications. I can develop the complete solution including database design, backend APIs, frontend interface, authentication system, integrations, and production deployment. >>> 40-45 hours weekly I am available for work<<<< >>> you will track all progress of the project thru the tracker <<< I have experience designing secure and maintainable architectures with clean code practices, optimized database structures, and AI-powered features such as conversational guidance and intelligent decision-support workflows. The project will be developed using Agile methodology with regular progress updates, proper documentation, and a scalable approach to support long-term growth. I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT, COMPLETE SOURCE CODE, AND ASSISTANCE FROM DEVELOPMENT TO DEPLOYMENT. I am available on desk as per your convenient time zone and will work on your project until you are satisfied with my work. I eagerly await your positive response. Thanks, Christina

@kamran2012

Hello, I will deliver your AI-powered decision support platform: PostgreSQL database, NestJS backend with the deterministic calculation engine, React frontend for the conversational guidance layer, and deployment to a cloud environment. On a similar data-heavy platform, separating the calculation engine into its own service made scaling straightforward without touching the guidance logic. Questions: 1) Is the structured methodology already documented, or will we define it together? 2) Do you have a preferred cloud provider (AWS, GCP, or other)? Send me a message and we can go over the details. Best regards, Kamran

@denisSolution

Hi, I can build the scalable backend and database structure for your AI-powered decision support platform using PostgreSQL and NestJS, since deterministic calculations require a reliable data layer that scales well. I’ve designed similar structured data pipelines in Node.js that needed strict schema validation, which helped catch calculation errors early. I’d approach this using a modular NestJS architecture because it keeps the system maintainable while avoiding tight coupling. The biggest improvement will come from separating the calculation engine into isolated services. I’ll keep the changes incremental and test each layer independently before integration to ensure nothing breaks. The platform will handle high loads reliably and make future updates easier. If this matches your vision, I can start right now. Thanks, Denis.

@HamparProd

Hi, Your architecture is exactly how I believe AI-powered business platforms should be built: deterministic business logic for accuracy, with AI layered on top to provide guidance, explanations, and decision support rather than replacing the underlying methodology. I have experience developing scalable full-stack applications using PostgreSQL, Node.js/NestJS, REST APIs, cloud deployment, and modern frontend frameworks. For this project, I'd recommend React with TypeScript for the frontend because it offers an excellent ecosystem, long-term maintainability, and pairs well with NestJS for enterprise applications. The platform would be designed with modular services, role-based authentication, comprehensive API documentation, automated testing, and a deployment pipeline so it remains easy to extend as new AI capabilities and business modules are introduced. I'm looking for long-term collaborations and would be happy to help evolve the platform beyond the MVP as new features and AI capabilities are added.

@santoshkumars17

With over 5 years of professional experience in full-stack development, I am confident that I can turn your app idea into a scalable reality. My portfolio includes building SaaS applications and custom solutions using various frontend and backend technologies. Specifically, I have a strong command of SQL databases like PostgreSQL – which aligns perfectly with your needs. Node.js and NestJS have been my primary tools in backend development and I assure you of my expertise in both. Being familiar with React, Angular, and Vue.js, I can offer valuable insights on which framework would best suit your application's needs. Additionally, my experience with modern deployment strategies makes me an ideal candidate to ensure a smooth launch. In the spirit of a long-term collaboration, my dedication to producing clean code that's maintainable and performs optimally is an asset you can count on. Punctuality and clear communication are non-negotiable qualities for me which I believe will foster an effective workflow between us. Together, let's build a powerful AI-based decision-making tool to guide users efficiently!

@Stanisla03

I am a Full-Stack developer with strong Node.js, PostgreSQL, and React expertise, and delivering clean, well-structured, and highly optimized scalable applications is a flawless match for my workflow. By leveraging my experience with modern backend architecture, SQL databases, and cloud deployment, I can rapidly develop your AI-powered decision support platform while guaranteeing strict adherence to best practices and delivering deeply commented, highly readable code. Whether your project involves building a deterministic calculation engine, structuring conversational guidance, or configuring secure login systems, I will ensure it is flawlessly executed and completely error-free. My workflow naturally includes setting up robust database schemas, implementing structured methodologies, and generating comprehensive documentation of the underlying logic, ensuring your team has absolute clarity on how the platform operates. At my rate of $20 SGD/hour, I guarantee an efficient, reliable solution delivered strictly on time for our long-term collaboration. I am ready to discuss the architectural details and begin developing your scalable platform immediately.

@craigd43

For a project of this magnitude and complexity, you need someone who not only has the technical expertise but also an outstanding track record in delivering scalable and reliable applications. With my extensive experience in full-stack development, adeptness in Node.js/NestJS and proficiency in SQL databases (including PostgreSQL), I am well-equipped for the job at hand. Additionally, my familiarity with modern deployment strategies and cloud services will ensure a seamless transition from development to production. What sets me apart from the rest is my drive for optimal performance. Efficiency, scalability, and user-friendliness are not just buzzwords for me; they are the foundation of my coding approach. This is where my proficiency in Vue.js (in addition to React and Angular) would add significant value to your project. My strong background in AI-backed solutions echoes your intention to build an AI-powered decision support platform. Let's collaborate on this project not just as a simple job but as a long-term partnership where we can continuously enhance, maintain and evolve your product as it grows. Together, we can transform your project concept into a functional, powerful and intuitive reality. I am eager to learn more about your vision and how I can make it happen.

@Hammadhassan21

Hi, I understand you're looking for an experienced full-stack developer to build a scalable AI-powered decision support platform, covering everything from the database and backend to the frontend, authentication, deployment, and integrations. You also want a solid architecture that can support long-term growth and future enhancements. I will develop a secure and scalable solution using PostgreSQL, Node.js/NestJS, and the frontend framework that best fits your requirements, with a focus on clean architecture, performance, and maintainability. I'll handle the complete development lifecycle, including authentication, deployment, API integrations, and ensure the platform is built for future expansion. I have worked on similar full-stack applications involving complex business logic and scalable system design. Do you already have the deterministic calculation engine and methodology documented, or would you like me to help structure the technical architecture around those requirements? Here, you can review my previous work as an experienced professional: https://www.freelancer.com/u/tahasohail763 I can start immediately. Let's discuss further. Thanks.

@melikatfz

Hi there, When building a scalable application, it's crucial to integrate a robust architecture that ensures both performance and flexibility. A common challenge is achieving seamless interaction between the frontend, backend, and database layers, which can lead to scalability issues if not handled properly. My expertise in SQL databases, particularly PostgreSQL, alongside Node.js/NestJS, allows me to design a cohesive and scalable application architecture that aligns with your project's needs. Here are my questions: Could you specify any preferences for frontend frameworks among React, Angular, or Vue.js? Additionally, do you have any particular cloud service in mind for deployment? Let's discuss your project now!

@mayankinnovative

With my 20+ years of experience in web development, especially in PHP-based solutions, I am seasoned and ready to take on your full-stack project. While my core expertise is in WordPress and Laravel, I have skillfully navigated SQL databases (including PostgreSQL), Node.js, and modern deployment strategies - all requirements vital to your vision. Moreover, the AI-powered nature of your platform aligns directly with my passion for designing clean, scalable systems that bear effective results over time. From fixing complex backend logic to maintaining smooth user experiences with payment gateways or APIs—I've been there and I've conquered it all. Finally, the fact that most of my clients find a long-term collaboration after their initial task resonates with your search for someone who fits right into your business trajectory. I don't just craft one-off solutions; I focus on building reliable systems that grow sustainably. Find stability and scalability with me at-the-ready to fix, stabilize, and scale so you can focus on the bigger picture - your business' success. Let's connect!

@sekai1116

As a senior full-stack developer, I have deep expertise in the technologies and frameworks you require for your project. My work consistently includes building scalable and performant full-stack applications that integrate the ideal tech stack -- Node.js, PostgreSQL, and familiarity with modern deployment strategies. With these skills, I can design a powerful database architecture, create a robust backend, and implement a polished frontend using React, Angular, or Vue.js. I'd like to highlight my specific experience in AI-powered software development, which is directly relevant to your project's requirements. I have successfully implemented complex AI systems and decision support platforms using OpenAI, GPT-3, Claude, and Gemini API integrations. I can architect an application with deterministic calculation engines and structured methodologies alongside conversational guidance capabilities. Moreover, my work ethic aligns perfectly with a long-term collaboration approach. I strive to deliver not just functioning code but thoughtful planning, effective system architecture, smooth implementation and deployment strategies that are made with consequent optimizerputation of yoreward_percepMance_onong-term_s of an applicat combines determineAI-c malign means you'll less hassproblemsocussed on(' Laravel',e orof_tool usedbuil clients compli=selfcchains-dtask-assk['s all knowledge tbuilding scp

@KatrinaQ

Hi, I'm a senior developer with 20+ years of experience, Top Rated on Freelancer.com with 1,500+ completed projects and a 5-star record, and I've built scalable full-stack applications like this before. I'll start by designing the PostgreSQL database schema for your deterministic calculation engine, then build the Node.js backend with NestJS to handle the logic and API layer. For the frontend, I'll use Vue.js to create a clean interface with conversational guidance flows. I'll set up the cloud infrastructure on AWS or Azure, configure CI/CD for reliable deployments, and implement proper error handling to keep calculations accurate. I can begin immediately.

@shawanay

Hi, I’ve built scalable full-stack applications using PostgreSQL, Node.js, and modern frontend frameworks, with a strong focus on clean architecture and long term maintainability. From your job description, it sounds like you need a robust AI powered platform with a scalable foundation, secure authentication, and a responsive user experience. My approach: * Design a scalable PostgreSQL database and NestJS backend. * Build a fast, modern frontend using React (or your preferred framework). * Implement secure authentication, APIs, and cloud deployment. * Deliver clean, well documented code for future growth. Quick question: Will the AI component integrate with an existing LLM (e.g., OpenAI), or do you already have a custom AI service? Regards, Shawana

@SkillCrafts

I understand you need a scalable full-stack application built, much like the robust systems I've developed using PostgreSQL and NestJS for real-time data processing and user management. My experience aligns directly with your need for a solid backend foundation. My technical approach involves PostgreSQL for the database, leveraging its advanced features for scalability and data integrity. For the backend, NestJS will be the framework of choice, enabling a modular and maintainable architecture. For the frontend, I recommend React due to its extensive ecosystem and component-based structure, which facilitates rapid development and a responsive user experience. I'll implement a CI/CD pipeline for automated testing and deployment, utilizing Docker for containerization and a cloud provider like AWS or Google Cloud for scalable infrastructure. What are your current thoughts on the expected user load and data volume for the initial launch? Also, are there any specific third-party integrations that are critical for MVP? I'm available for a brief call to discuss how we can translate your vision into a high-performance, scalable application.

@MIndlabsAi6

Hey, I’m beyond excited to take this on! I recently wrapped up a similar project with good results. Drawing from my experience in SQL, Cloud Computing, NoSQL Couch & Mongo, Node.js, Express JS, PostgreSQL, AngularJS, Full Stack Development, Vue.js, Angular, I’m ready to dive into your project. Please initiate a chat for further discussion. Kind regards, Vishal Maharaj

@dilshadbukhari

Hello! Your project aligns well with my full-stack development experience. I can help build a scalable AI-powered decision support platform with a strong architecture, including PostgreSQL database design, NestJS backend, modern frontend, authentication, integrations, and cloud deployment. I focus on writing clean, maintainable code and building systems that are easy to scale and extend. I’m comfortable working on long-term collaborations and can help transform your methodology into a reliable, user-friendly application. I’d be happy to discuss the project in detail.

@gauravl3

Having built several scalable applications from scratch, I'm confident in my ability to meet and exceed your needs for this project. My proficiency with SQL databases, particularly PostgreSQL, will ensure a reliable and efficient database structure for your app. Additionally, my strong knowledge of Node.js in conjunction with frameworks like React, Angular or Vue.js will allow me to create a powerful backend system integrated with an intuitive frontend interface that perfectly aligns with your design. I understand the complexities involved in deploying complex applications, but over the years I've worked hard to master modern deployment strategies on cloud services like AWS, Azure and Google Cloud. With me on board for your project, you can have peace of mind knowing that your application will be secure, scalable and high-performing. What truly sets me apart is my advanced skillset in Artificial Intelligence. For instance, I've designed chatbots, AI assistants and implemented workflow automation systems for our clients - skills that could be directly relevant to building your AI-powered decision support platform. In conclusion, I am more than capable of fulfilling your project's requirements in a way that returns real business value for you. It would be my pleasure to start this exciting journey with you and {'turn'(if started)}transform{' your idea into'}a powerful, scalable product ?.