Senior Backend Engineer for Training Platform

@vishal1145

Your 100+ API backend will fail under load if you're planning to hit PostgreSQL directly for every request. Without a proper caching layer and connection pooling strategy, you'll see database timeouts around 500 concurrent users - Redis alone won't save you if the query patterns aren't optimized first. Before architecting the solution, I need clarity on two things: What's your expected read/write ratio across these APIs, and are you planning horizontal scaling with multiple Node instances or vertical scaling on a single server? This determines whether I design for eventual consistency or strict ACID transactions. Here's the architectural approach: - NODE.JS + EXPRESS: Build a modular API structure with middleware chains for auth, validation, and rate limiting - I've used this pattern to handle 50K requests/minute without bottlenecks. - POSTGRESQL OPTIMIZATION: Design normalized schemas with proper indexing and implement connection pooling via pg-pool to maintain 10K+ concurrent connections without memory leaks. - REDIS CACHING: Implement multi-layer caching (query results, session tokens, rate limit counters) with TTL strategies that reduced database hits by 70% in my last training platform build. - DOCKER + CI/CD: Set up multi-stage builds with health checks and zero-downtime deployments using GitHub Actions - I'll configure staging/production environments with automated rollback on failure. - API SECURITY: Implement JWT with refresh tokens, request signing, and SQL injection prevention through parameterized queries - I've passed SOC2 audits using this approach. I've built 3 similar training platforms that scaled from 5K to 100K users. The biggest mistake I see is treating all 100 APIs equally - 20% will handle 80% of your traffic, and those need different optimization strategies. Let's schedule a 20-minute call to discuss your traffic patterns and failure scenarios before you commit to a build timeline.

@vipinjain1213

Hello, H100+ APIs on a high traffic platform is where small architecture decisions early on become big problems later. Things like how you structure middleware, how Redis caching is layered, and how database queries are written all compound over time. Getting those right from the start is what keeps the system fast and stable under load rather than needing a rewrite six months in. Node.js backend, PostgreSQL with well designed schema and optimised queries, Redis for caching and session management, Docker for deployment, CI/CD pipeline configured from day one. API security, rate limiting and proper validation built into every endpoint not added later. We've built large scale backend systems before with similar tech stacks and understand the difference between code that works and code that holds up under real traffic. One question before we talk timeline — do you have the API specifications already documented or will defining the 100+ endpoints be part of the first phase?

@Yunsoft

Hi , I just saw your project regarding Senior Backend Engineer for Training Platform. I've been building scalable web apps and custom integrations for a while, and this fits right into my wheelhouse. I'm a full-stack developer with hands-on experience in AI (custom LLMs, RAG, workflow automation), SaaS architectures (React, Node.js), and Web3 integrations. Instead of just delivering basic scripts, I focus on building secure, production-ready solutions that actually scale. I've launched multiple real-world products and know how to avoid the common technical pitfalls in these areas. I took a quick look at the files you attached, and the technical requirements make perfect sense to me. Let's hop on a quick chat so we can go over your exact needs. I can share some of my recent work so you can see the code quality firsthand. Best, Emre

@webnsoftindia

─=≡☆≡=─ Backend Senior Engineer Proposal — Training Management Platform ─=≡☆≡=─ Hello, I understand you are seeking a **senior backend engineer** to build a **scalable, secure, high-performance backend** for a training management platform supporting 500,000+ users and 100–110 APIs. 1. **Backend Design** * Modular, service-oriented architecture for **scalability and maintainability** * RESTful API layer (100–110 endpoints) with **role-based access control (RBAC)** * Optimized PostgreSQL schema for **students, courses, enrollments, exams, certificates, and admins** * Redis caching for **session management, analytics, and high-concurrency performance** 2. **Security & Authentication** * Multi-step secure login (ID + password → reCAPTCHA → OTP verification) * Password hashing, rate limiting, and account lockouts for brute-force protection * Session timeout, token invalidation, and force-logout capability * Input validation, XSS and SQL injection prevention 3. **High-Performance Operations** 4. **Certificate System** 5. **Admin & Student Panels** * **Admin dashboard**: KPIs, charts, role management, course/exam management * **Student panel**: Course enrollment, exam attempts, results, certificate downloads * Dynamic course management with retry logic and analytics Looking forward to discussing this opportunity further. Thanks

@kishanbwts

Building a backend with 100+ APIs to support a high-traffic training platform needs careful planning to keep it fast, secure, and reliable. I've helped a client in education tech scale their Node.js backend with a similar API count and load, focusing on PostgreSQL query optimization and Redis caching to handle thousands of concurrent users smoothly. I’ll start by designing a modular API structure that makes future updates easier and performance more predictable. For security, I’ll implement token-based authentication with strict validation and rate limiting to protect against abuse. To keep your deployment robust, I can set up Docker containers with a CI/CD pipeline that automates testing and rollout, minimizing downtime. Two quick questions: Do you have preferred strategies for API versioning or rate limiting, or should I propose what fits best your user patterns? Also, are there specific reporting or monitoring tools in place for production, or would you like me to include recommendations? I’m ready to dive in, build the backend, and get your platform running smoothly fast.

@RajAbhisek

Hi, I'm Raj, a backend developer with solid experience in building scalable systems using Node.js, PostgreSQL, and Redis. I've worked on multiple projects involving high-traffic platforms. Building REST APIs with Node.js, setting up PostgreSQL schemas that actually perform well, using Redis for caching, containerizing with Docker, and setting up CI/CD pipelines; these are areas where I can definitely help. I also understand the importance of security, rate limiting, and keeping things optimized for concurrent users. If you'd like to discuss the project details, timeline, and how I approach this, feel free to ping me in the chat. Looking forward to working with you. Cheers, Raj Abhisek Panda

@gauravl3

As a Full-Stack Developer with expertise in Node.js and NoSQL databases, I am confident in my ability to help you build a robust and scalable training management platform. My experience includes delivering production-ready backend systems for large-scale platforms, a skill that is crucial for this project. With CloudStack Innovators, we've successfully developed and deployed over 100 REST APIs, a task which aligns well with the 100–110 APIs your project requires. My understanding of scalable architecture, system security, and REST API design means that not only can I deliver a backend system that meets your immediate needs, but also one that can accommodate future growth as your user base expands. My previous projects have often required handling high user concurrency and implementing secure authentication/authorization mechanisms - skills that I believe are essential for ensuring the performance, security, and reliability of your platform. Additionally, my proficiency in PostgreSQL and Redis assures you of optimized database design, efficient queries, caching for improved performance, and session management. These are key components needed to meet the demands of your high-traffic platform. In conclusion, I have the experience and expertise you need for building a scalable backend system and I am excited at the prospect of helping you bring your training management platform to life!

@ViktorTrefilov01

✨✨✨✨✨ Hi, I can start working right now. I have experience building interactive web interfaces with drag-and-drop functionality similar to Google Calendar, where users can move and rearrange elements smoothly. I can implement table movement interactions so users can drag and reposition tables just like moving meetings in Google Calendar, ensuring the UI remains responsive and intuitive. Regards,

@rajmalviyamalviy

Hello, I reviewed the project scope and the architecture expectations for the training management platform. With 10+ years of backend engineering experience, I specialize in building scalable systems designed for high-traffic environments. Based on the requirements, the platform needs a robust architecture capable of supporting 500k+ users, handling 100+ APIs, and maintaining high performance during peak loads. I would design a clean Node.js service architecture with optimized PostgreSQL schemas, Redis caching for performance, and containerized deployment using Docker. Key areas I would focus on include secure authentication with OTP, RBAC for admin management, exam attempt logic, certificate generation, and optimized analytics queries. I also have strong experience implementing rate limiting, audit logging, and input validation to ensure production-grade security. For scalability, I would implement background workers, caching layers, proper indexing, and queue systems to handle concurrent enrollments and heavy analytics queries. I can deliver a production-ready backend with full API documentation, CI/CD pipeline, and deployment setup. Happy to discuss the architecture in more detail.

@ixorawebmob

Hello, I’ve gone through your project details, and this is something I can definitely help you with. I have 10+ years of experience in mobile and web app development, working extensively with Node.js and backend architecture, along with expertise in PostgreSQL, Redis, and Docker. I'm skilled in building scalable and secure systems that can handle high traffic and user concurrency, ensuring both performance and reliability. I will review your requirements, suggest the best technical approach, and proceed with development while keeping you updated at every stage. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify: 1. Are there specific user load expectations that I should be aware of? 2. Do you have existing documentation for the APIs required? 3. What are your expectations regarding the project timeline? 4. Are there any specific security measures you want to implement? Let’s discuss over chat! Could you clarify: 1. Are there specific user load expectations that I should be aware of? 2. Do you have existing documentation for the APIs required? 3. What are your expectations regarding the project timeline? 4. Are there any specific security measures you want to implement? Regards, Arpit Jaiswal

@bhartimalu

Hello, I’m a senior backend engineer with extensive experience in PostgreSQL, API design, database modeling, and performance optimization. I can train your team on backend best practices, efficient SQL queries, schema design, indexing, transaction handling, and real‑world architecture patterns to help them level up quickly. I focus on clear explanations, hands‑on examples, and practical exercises that reinforce strong backend skills. Regards, Bharti

@abhisyc70

Hello, My approach would be to design a clean, modular Node.js backend architecture that supports scalability and maintainability as the platform grows. APIs will follow consistent REST patterns with proper validation, authentication, and role-based authorization. Key implementation areas: • Build 100–110 REST APIs using Node.js with scalable architecture • Design optimized PostgreSQL schema and indexing strategy for high-volume queries • Implement Redis caching and session management to reduce database load • Secure authentication, authorization, and rate limiting for API protection • Containerized deployment using Docker • CI/CD pipeline for automated deployments and safe production updates • Performance optimization for high concurrent users • Complete API documentation and maintainable codebase I have 10+ years of full-stack development experience and have built production systems using Node.js, PostgreSQL, Redis, and containerized deployments, including enterprise-level platforms where reliability and scalability were critical. I can start immediately and would be happy to review your system requirements and propose a scalable architecture. Let’s schedule a quick discussion so we can align on the API structure and deployment strategy.

@swenidinfo

With a strong background in Node.js and over a decade of experience as a senior backend developer handling large-scale platforms, I am well-equipped to build a scalable, reliable, and high-performing backend system for your training management platform. My team at Swenid Private Limited is committed to delivering production-ready systems that meet the highest standards of performance, security, and reliability. I bring advanced knowledge in PostgreSQL database design and have hands-on experience using Redis for cache management, both of which will be crucial in optimizing your platform's database queries and caching strategies. I also have extensive experience with Docker and containerized deployments for seamless CI/CD pipelines, enhancing the efficiency of software development while maintaining high quality. Moreover, I am well-versed in REST API design and understand the significance of scalable architectures for systems serving a large user base. Having dealt with high-traffic systems in the past, I am mindful of best practices that ensure smooth authentication, authorization, rate limiting and system security. By entrusting this project to me and my team at Swenid Private Limited, you'll be investing in robust deliverables: a fully deployed infrastructure with all necessary documentation and configuration – ready to drive your training platform forward.

@Sahil1402

Hey, i am a full stack developer with over 5+ years of experience. I work in a fintech company as a senior backend engineer and i would love to help you with your project. The tech stack looks familiar and i have worked on more than 20+ projects on this. Would love to hear more about the project from you. P.s I could’ve used ai to generate a bid response for this project, but i think this looks more connected. Hope you get it.

@itbcosolutions

Hello, Your requirement for a senior backend engineer to build a scalable system with 100+ APIs for a high-traffic training platform is clear. This is a production-grade system requiring strong architecture, performance tuning, and security—areas where we have deep expertise. At Team ITBCO Solutions, we design and deploy large-scale backend systems with Node.js, PostgreSQL, Redis, and Docker-based infrastructure. Our approach: • Design a scalable, modular architecture (service-based / layered) • Develop 100–110 REST APIs with proper validation, versioning, and documentation • Implement secure authentication & RBAC • Optimize PostgreSQL schema, indexing, and query performance • Use Redis for caching, sessions, and performance optimization DevOps & deployment: • Dockerized services with CI/CD pipelines (GitHub Actions / Jenkins) • Automated deployments on cloud (AWS / GCP) • Monitoring, logging, and error tracking setup Performance & security: • Rate limiting, input validation, and API security best practices • Load optimization for high concurrent users • Scalable architecture ready for future expansion Deliverables: • Production-ready backend + APIs • API documentation • Docker setup + CI/CD pipeline • Fully deployed infrastructure You can review our work through our Freelancer portfolio and company website: itbco.in. We’d be glad to contribute as a senior backend partner for this platform. Best regards, Team ITBCO Solutions

@tede4

i have strong experience building scalable backend systems using node.js, postgresql, and redis, including high-traffic applications with large api surfaces. i can design and deliver a production-ready backend architecture that supports 100+ apis with performance, security, and maintainability in mind. i will structure the system using clean modular architecture (service-based or domain-driven), ensuring each api is well-organized, validated, and optimized. postgresql schemas will be designed for efficiency and scalability, with indexing and query optimization, while redis will be used for caching, session management, and reducing load under high concurrency. i’ll implement secure authentication/authorization, rate limiting, and proper input validation to ensure system integrity. for deployment, i’ll containerize the application using docker and set up a ci/cd pipeline for smooth, automated releases. i also focus on monitoring, logging, and performance tuning to ensure the system remains stable in production environments. you’ll receive a fully deployed backend, complete api documentation, and a clean, maintainable codebase ready for scale. ready to start immediately and deliver a reliable, high-performance backend