Vinod Kumar · Full Stack Developer | AI Application Engineer

I build digital products and AI-powered apps that hold up in production.

Full stack developer with nearly 7 years of experience shipping React, Node.js and PostgreSQL applications, and integrating AI into them with the backend firmly in control.

View ProjectsContact MeRésumé (PDF)
  • Full StackReact · Node.js · PostgreSQL
  • AI IntegrationsOpenAI · Agents · MCP
  • Production SystemsLinux · Nginx · AWS

Engineering in practice

How an AI feature runs, end to end

The model is one step in a backend workflow. Requests are validated, prompts are built on the server, and nothing is stored or published until the output passes business rules.

ai-workflow · run 2741 demo

Workflow

  1. Request receivedPOST /api/generate · schema validdone
  2. Prompt assembledtemplate + context, server-sidedone
  3. Model callprovider response parseddone
  4. Output validatedbusiness rules: 6 passed, 0 blockeddone
  5. PersistedPostgreSQL · status = approveddone

10:42:07inforun 2741 queued

10:42:08infoprovider responded, 812 tokens

10:42:08okvalidator passed, writing record

10:42:09okrun 2741 approved

Runs today

1,284

Validation pass rate

96.4%

Median response

1.8 s

Runs per hour

Validation queue cleared

Illustrative demo data showing the workflow pattern, not metrics from a real product.

Vinod Kumar in a navy blazer and white shirt
Vinod Kumar · Noida, India

About

Full stack, from interface to infrastructure

I'm a full stack developer in Noida with nearly 7 years of professional experience. At Garage Productions I own application modules end to end within a development team: React UI, Express.js APIs, PostgreSQL schemas, deployment and production support.

My recent work centres on SaaS products and on integrating AI so that the backend, not the model, decides what happens. Before that I built PHP, WordPress and Shopify sites for client CMS and e-commerce work.

More about how I work

  1. 01

    Frontend engineering

    Responsive React interfaces built on clear component boundaries and API contracts that stay decoupled as features change.

    • React.js
    • JavaScript (ES6+)
    • HTML5
    • CSS3

  2. 02

    Backend & REST APIs

    Express.js services with explicit endpoint contracts, request validation and error handling, plus third-party API integration.

    • Node.js
    • Express.js
    • REST API design

  3. 03

    AI / LLM integrations

    OpenAI and GPT calls run as a backend service layer. Agent workflows and MCP tools sit behind validation and business rules that decide what output may trigger.

    • OpenAI API
    • GPT models
    • AI agents
    • MCP servers
    • Prompt engineering

  4. 04

    Database-backed applications

    Schemas for application content, user data and workflow state, and fixing data issues that affect live applications.

    • PostgreSQL
    • MySQL
    • Schema design

  5. 05

    Deployment & production

    Node.js and PHP apps deployed and maintained on Linux servers, live sites migrated between providers, and defects traced from symptom to root cause.

    • Linux/Ubuntu
    • Nginx
    • Apache
    • AWS
    • DigitalOcean
    • k6

Featured case study

OnGrid.work: one workspace for team operations

Built the core application modules and backend workflows end to end: React interfaces, Express.js REST APIs and PostgreSQL data models.

Read the case study

  1. 01

    The problem

    Project management, task ownership, workload planning and business processes need to live in one workspace instead of being scattered across tools.

  2. 02

    My contribution

    Built the core application modules end to end. Built the backend workflows behind them: React interfaces, Express.js REST APIs and PostgreSQL data models.

  3. 03

    Technical approach

    React interfaces for the core modules. Express.js REST APIs implementing the backend workflows. PostgreSQL data models connecting projects, tasks, workload and processes.

React UIExpress.js REST APIPostgreSQL data models

Experience

Nearly 7 years of shipping and running web applications

  1. Full Stack Developer

    Garage Productions Pvt Ltd, Noida

    • Own assigned application modules end to end within a development team, from React UI and Express.js APIs to PostgreSQL schemas, deployment and production support.
    • Integrate the OpenAI API and GPT models as a backend service layer, and build AI agent workflows and MCP integrations gated by server-side validation.
    • Deploy and maintain 15+ client applications on Linux servers across AWS, DigitalOcean, Linode and Hostinger; migrated 20+ live sites between providers.
    • Diagnose production defects across browser, network, API, database and server layers.

  2. Web Developer

    Connecting Dots Pvt Ltd

    • Delivered and maintained client WordPress websites, including customisation, content migrations, release updates and QA before handover.
    • Installed and administered Apache and Nginx servers, and set up domains and hosting for clients.

More work

AI automation, e-commerce and web platforms

WordPress & PHP builds

Browse all projects by category

Contact

Have a product to build or an AI feature to ship?

I'm happy to talk about full stack engineering, product development or AI integration work.

Get in touch