Senior Full-Stack Developer for Secure Web Platform + IoT Device Integration

@diektech

Hi, This is Elias from Miami. I checked your project description and understand you’re looking to build a secure web platform integrated with IoT devices. The goal is to create a production-grade solution that efficiently manages data and user interactions. I’ve worked on several similar platforms and understand the key technical challenges involved, particularly with Node.js and API integrations. I’d be happy to go through the details and suggest the best technical approach. To get a better understanding, I have a few questions: Q1 – What specific user roles do you envision for the platform? Q2 – Are there any existing systems or devices that need to be integrated with this platform? Q3 – What kind of scalability do you anticipate for the application in the future? Looking forward to hearing from you.

@LiveExperts

Hello, As a full-stack developer with a strong background in embedded systems and software architecture, I am confident that my team at Live Experts is the perfect fit for your project. With a deep understanding of MQTT and Mosquitto, we can seamlessly integrate your ESP32-based devices with your web platform, ensuring secure and reliable communication. In addition to this, our proficiency in PostgreSQL and Node.js/NestJS/Express will facilitate the creation of robust backend infrastructure. One area where we excel is in creating complex dashboards and payment systems. We have successfully built similar platforms, involving dashboard functionalities, payments, and IoT integrations with secure authentication and role-based access control. Our thoroughness extends beyond project production into post-launch support. Should you choose us for this task, we guarantee not only your development package but also deployment (staging and production environments) and even the device simulator for integration testing. Well-versed in HTTPS security norms and safe transaction handling for payment-to-hardware flows, we'll deliver a secure web platform while ensuring smooth interaction with your IoT devices. In short, with our experienced team onboard, you can rest assured that your project will be handled meticulously from start to finish. Let's get started! Thanks!

@ykarora26

Hello! I am excited about the opportunity to work on your project requiring a senior developer or small senior team to build a production-grade web platform connected to ESP32-based devices via secure MQTT. With a clear project direction, completed firmware, PCB work in progress, UI screens, and a detailed functional specification already in place, I am confident in my ability to provide the strong execution needed to deliver the customer web application, business/fleet system, operator dashboard, super admin dashboard, backend infrastructure, and device simulator as per the outlined requirements and important business rules. Regards, Yogesh Kumar

@elishadiah326

Hi. Thank you for posting the good project! I understand this is a full IoT platform (not just a web app), involving ESP32 devices via secure MQTT, wallet-based transactions, RBAC, and multiple dashboards. This requires strong backend architecture and reliable payment-to-device execution handling. I have experience building real-time platforms with dashboards, RBAC, audit logs, and MQTT/WebSocket integrations. I focus on scalable backend systems and clean, maintainable frontend using React/Next.js. Milestones: 1. Architecture & DB 2. Auth + RBAC 3. Wallet & payments 4. MQTT + simulator 5. Apps & dashboards 6. Testing + deployment Timeline: ~6–8 weeks for production-ready V1. I can deliver full development, deployment, and device simulator, with post-launch support available. Looking forward to working with you. Best regards, Diah

@rizwange4

Subject: Proposal for Your Web Development Project Hi, Afte r reviewing the details of your project , I’m excited about the potential to collaborate with you. With over a decade of experience in web development, I’m confident in my ability to deliver exceptional results. Here’s why I believe I’d be a great fit for your project: Front-End Development: I have expertise in HTML, CSS, JavaScript, and Bootstrap, enabling me to create visually appealing, responsive designs. Back-End Development: Proficient in CodeIgniter, Laravel, MySQL, and PHP, I can provide robust and scalable solutions. Platform Experience: I am well-versed in WordPress, Shopify, WooCommerce, Elementor, and Webflow. Design/UI/UX: I specialize in Figma, jQuery, and converting PSD files to HTML to ensure a seamless user experience. I am available to start right away and can accommodate your schedule. I would love to discuss how I can help bring your project to fruition. Looking forward to your response! Best, Muhammad Rizwan LA

@iosifpeterfi

I'm Iosif Peterfi, 15+ years of delivering secure, scalable platforms across web, automation, and cloud. This is my speciality: building end-to-end, secure IoT platforms that connect devices to robust web apps with precise RBAC, audit trails, and reliable payment flows. You're looking to move from firmware to a production-grade platform that coordinates ESP32 devices via secure MQTT, with customer flows (QR, login, wallet, top-up, pay-and-start, session success, history), a fleet system, operator dashboards, and a device simulator for pre-live testing. You need secure API, multi-tenant RBAC, device registry, staging and production environments, plus two personal and two business subscription tiers and audit-enabled wallet adjustments. I will deliver a complete platform with clear ownership, risk reduction, and measurable business value: a production-ready web app layered by role, robust wallet and payment handling, device integration, and governance for users and operators. The project will be delivered in well-scoped milestones: core platform scaffolding with RBAC and security review; customer flows and wallet/payments; fleet and sub-accounts; operator and super admin dashboards; device registry, MQTT integration, and audit logs; device simulator and end-to-end testing; staging to production deployment and cutover. This phased approach minimizes risk, enables parallel work streams, and allows early validation with the device simulator.

@jinufeb14

With a solid standing in the freelance community (currently ranked #6248 in freelancer, which puts me in the top 1% of freelancers), I am your ideal pick for this project. My mastery in Node.js and React.js technologies makes me adept at building modern frontends and backends similar to what you require. I'm not only skilled at creating flawless UIs, but also have considerable experience with secure authentication, audit logs, wallet/payment flows and RBAC - which are all integral parts of your project.

@solutionsplayers

With over six years of full-stack development experience, I believe my skill set perfectly aligns with what your project demands. I have a strong proficiency in React JS and Laravel - which, coupled with my software architecture acuity will be invaluable in delivering robust systems for your frontend needs and RBAC-based backend operations. Moreover, given your emphasis on database security and MQTT integration, I'm confident that my expertise in MySQL and NestJS will affluently fulfill these requirements. In terms of experience, not only have I comfortably adapted to using various stacks and technologies in the past, but sublimely thrive as well. For example, to indicate my prior IoT experience alongside creating native applications - I've developed custom Laravel-based stores with Payment Gateway Integration as well as Firebase integration for cross platform Flutter apps. In a nutshell, building scalable solutions is my niche; encapsulating backend with cautious regards to frontend demands. Hence, entrusting me with this project means augmenting your product direction with solid execution. Don’t hesitate to contact me to discuss any questions or concerns you may have!

@samarhabib

Greetings, I can lead the end-to-end build of your production-grade platform—covering secure API architecture, MQTT integration with ESP32 devices, RBAC, multi-tenant dashboards, and wallet-based transaction systems. I have experience delivering complex, real-time systems with scalable backend infrastructure, strict access control, and clean, maintainable code across customer, business, operator, and admin layers. I’ll ensure a robust, secure deployment with staging, device simulation, and a solid foundation for long-term scaling. Why work with me? ★ Proven track record: 73 successful projects with 5-star reviews ★ Expertise in Node.js, Angular, React, Express, Python, Django, Flask, PHP, Laravel, Codeigniter and more ★ Responsive, deadline-focused, and committed to results ★ 3 months of free post-launch support Let’s schedule a quick chat to discuss your preferred tech stack, timelines, and launch goals. I’m confident I can bring your vision to life. Best regards, Samar H.

@johnallenvillan1

Hi, I’ve read through the full scope, especially the need for a production‑grade platform tied to ESP32 devices over secure MQTT, and the multi‑role system spanning customer, business, operator, and super‑admin levels. I’ve delivered several IoT‑connected platforms where hardware events, payments, and web dashboards had to stay tightly synchronized, including a fleet‑oriented EV‑charging system and an asset‑tracking platform that used NestJS, PostgreSQL, and Mosquitto with per‑device credentials. I see the main challenge here is enforcing strict RBAC, wallet integrity, and audit consistency while handling hardware states that don’t always align with payment flows. Ensuring safe reconciliation across ACK/EXEC states and maintaining traceability is where platforms like this often fail without senior oversight. I’ll structure the backend in NestJS with isolated modules for wallets, device events, MQTT handlers, and tier/sub‑account logic. I’ll implement staged environments, a device simulator for full flow tests, and clear retry and manual‑review logic when payments and device execution diverge. Before starting, I need to confirm environment preferences and how you’d like test devices represented in staging. Sincerely, John allen.

@Hubready

Hello! This is James from Hollywood, and I’m excited about the opportunity to develop your secure web platform with IoT device integration! I carefully reviewed your project description and understand the goal of creating a production-grade solution. With my 15 years of experience in full-stack development and expertise in Node.js, PostgreSQL, and React.js, I’m confident I can deliver results that meet your needs. To ensure I align with your vision, could you please clarify the following questions to help me better understand the project? 1. What specific IoT devices do you plan to integrate, and are there any existing APIs we should consider? 2. Do you have a defined timeline for the project, or is there flexibility based on development phases? 3. Are there any specific security protocols or compliance standards you want to prioritize in the web platform? As a senior developer, I believe in structured milestones and clear communication. I’ve successfully built similar platforms in the past, such as a custom IoT dashboard for smart home devices and a secure e-commerce site that integrates with various APIs. I’m ready to bring my skills to your project and ensure it not only meets technical specifications but also aligns with your business goals. Let’s chat about how we can make this a success!

@juanestebana17

Hello, With extensive experience in developing secure, scalable full-stack platforms integrated with IoT devices, I am well-equipped to execute this complex project efficiently. I will leverage my expertise in React and Node.js to deliver an advanced web platform with comprehensive dashboards, secure workflows, and IoT integration. What are the key success metrics for the initial product release to ensure it meets your operational goals? Thanks, Juan Aponte

@AlexDeveloper911

Hey, I am ready when you are.✅ I’ve worked on something very similar. Building a secure web platform with IoT device integration presents challenges in seamless communication and data handling. What really matters here is ensuring secure MQTT integration for ESP32-based devices. I've successfully implemented similar IoT integrations with secure communication protocols. Most projects fall apart when handling payment success but hardware failure scenarios. My approach involves implementing retry logic and manual review processes to ensure seamless transactions. Let's chat! -Oleksandr

@arslanshahid386

Hi there, I see you’re looking for a senior developer to create a robust web platform that integrates with ESP32-based devices using secure MQTT. With 4+ years of experience in full-stack development, I can help bring your detailed functional specifications to life. My approach would involve building a seamless customer web application alongside a comprehensive backend to ensure secure API interactions and effective device communication. I have a solid background in Node.js, React, and MQTT integration, which will allow me to efficiently handle the complexities of device management and payment flows. Additionally, I understand the importance of security, having implemented secure authentication and audit trails in previous projects. Could you share more about the specific business logic that needs to be integrated into the operator dashboard? Best regards, Arslan Shahid

@arbu1499

Greetings, I’d love to help build your production-grade web platform with full ESP32/MQTT integration. I have extensive experience developing real-time dashboards, secure payment flows, and IoT-connected systems, and I understand the critical need for scoped access, wallet logic, and device state tracking you described. I can deliver the full stack—from customer apps to super-admin dashboards—along with a device simulator, audit logging, and smooth staging-to-production deployment. My approach ensures reliability, security, and seamless integration between hardware and software. Looking forward for your positive response in the chatbox. Best Regards, Arbaz M

@shawanay

I'm a senior Full Stack developer with 7+ years of experience, and here is my approach: 1. Set up backend with secure API, RBAC, wallets, PostgreSQL and MQTT device integration. 2. Implement main workflows for customer app, business/fleet system, operator dashboard, and super admin dashboard. 3. Build QR flow, guest checkout, login, wallet top-up, pay-and-start, session tracking, map, support, and transaction history. 4. Handle business subscriptions, vehicle/driver sub-accounts, budgets, fleet usage, and CSV exports. 5. Integrate payment flows with retry/manual review for hardware execution mismatch 6. Develop device simulator for integration testing before live hardware rollout. Deploy staging and production environments with full monitoring and post-launch support. I specialize in Optimized & high-converting complex platforms with IoT/device integration. You can check my previous similar work in my profile By now, you likely have a strong sense of my experience. Let’s connect and discuss how I can execute this project end-to-end.

@douglasfullstack

I can handle this project and deliver a robust, secure web platform integrated with your ESP32 devices over MQTT. Your detailed specs and existing firmware set a solid foundation, and I’m confident in building a scalable solution with Node.js for backend logic, PostgreSQL for reliable data handling, and React.js for an efficient, user-friendly frontend. I will ensure secure communication with MQTT and develop all layers you outlined: customer app flows, business fleet management, operator dashboards, and super admin oversight. My approach guarantees clean architecture, smooth interactions, and maintainable code to support future growth. I’ve led similar full-stack projects blending IoT integration with complex business workflows, focusing on security, performance, and UX. I suggest we clarify deployment preferences and any CI/CD needs early to streamline delivery. Would you like me to prepare a quick technical outline before we start?

@SkillCrafts

I’ve spent eight years building high-availability IoT ecosystems, including a recent secure tracking platform that integrated real-time sensor data with a Node.js backend via MQTT. Your requirement for a production-grade platform suggests you need a robust architecture capable of handling low-latency device communication without compromising data integrity. I am confident that my background in architecting secure APIs and managing encrypted device-to-cloud handshakes aligns perfectly with your technical demands and security needs. My experience ensures that the bridge between your hardware and the web interface is both seamless and resilient against common vulnerabilities. To ensure scalability, I will implement a microservices architecture using Node.js for the backend and React.js for the frontend. I'll utilize MQTT with TLS 1.3 for secure, bi-directional IoT communication and implement OAuth 2.0 for enterprise-grade authentication. For the data layer, I’ll leverage a hybrid approach—PostgreSQL for relational data and TimescaleDB for time-series telemetry—ensuring high-performance retrieval of device logs. Each component will be containerized via Docker to ensure the platform remains resilient under heavy device loads, with a strict focus on end-to-end encryption and automated CI/CD deployment pipelines for rapid, secure iterations. Regarding the IoT hardware, are you using a protocol like CoAP or MQTT, and will the devices require OTA firmware update capabilities via the dashboard? I would also like to clarify if you have a preferred cloud infrastructure like AWS IoT Core or if we are building a custom broker solution. I’m available for a brief chat to discuss the technical roadmap and expedite the delivery of a secure MVP. Let me know if you’d like to message or hop on a call to align on the security specifications.

@Drnath2025

✨ Hello! Concept page navigation review complete I’m genuinely interested in this project because it’s a serious production-grade IoT + payment + role-based platform, and I’d like to contribute to building a stable system that safely connects web, wallets, and ESP32 devices through MQTT with clean architecture and reliable execution flow. Start immediately | Timeline: 18–22 days | Budget: €680 I’ve worked on similar backend-heavy systems involving real-time communication, role-based dashboards, and API-driven platforms where reliability between user action and device execution was critical. In one project, I built a Node.js + MQTT-based control system for connected devices with secure tokenized device registry and real-time status tracking, including retry handling when execution and confirmation were not aligned. For your project, I would structure the system around a secure API layer handling wallets, sessions, and device commands, while MQTT manages real-time device communication with clear ACK/EXEC state separation. I would also ensure strict RBAC so personal, business, operator, and super admin layers remain fully isolated with audit-safe actions, especially for wallet adjustments and transaction flows. I’m open to discussing architecture and milestones in chat so we can align the system design properly before development begins. Warm regards, Nathalie