About me
Full Stack & AI Engineer with 4+ years of experience building scalable web applications, cloud-native systems, and AI-powered products. Skilled in modern frontend and backend development, Generative AI, LLMs, RAG architectures, AI agents, automation workflows, and Data Science. Passionate about transforming complex ideas into intelligent, high-impact solutions that drive business growth and deliver exceptional user experiences.
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What I'm doing
Full Stack Web Development
- Building responsive frontends with React & modern UI libraries (MUI, Radix, shadcn)
- Scalable backend APIs with Node.js, Express, and PostgreSQL / MongoDB
- JWT & session-based authentication, role-based access control
Next.js & React Development
- High-performance SSR / RSC applications with Next.js App Router
- SEO-optimized pages with structured data, Core Web Vitals, and dynamic OG images
- Full-stack API routes with Prisma ORM and PostgreSQL
AI Automation & Integration
- Integrating OpenAI GPT-4o & Anthropic Claude APIs into web applications
- Building n8n & Make.com automation workflows to eliminate repetitive tasks
- Designing RAG (Retrieval-Augmented Generation) pipelines with vector search
UI & UX Implementation
- Pixel-perfect UI from Figma designs with Tailwind CSS and shadcn/ui
- Accessible, keyboard-navigable components following WCAG 2.1 guidelines
- Smooth animations and micro-interactions for delightful user experiences
Performance & SEO
- Core Web Vitals optimization: LCP, FID, CLS targeting 90+ Lighthouse score
- Structured data (JSON-LD), dynamic OG images, sitemap, and robots.txt
- GA4 / GTM integration, conversion tracking, and performance monitoring
Mobile App Development
- Cross-platform iOS & Android apps with React Native and Expo
- Native device APIs: camera, push notifications, offline storage
- App Store & Google Play deployment with CI/CD pipelines
Testimonials
Eleservsoft Tech
Manoj delivered our company website with exceptional attention to detail and professionalism. The website reflects our brand perfectly, provides a seamless user experience, and was completed within the agreed timeline. His technical expertise and responsiveness made the entire process smooth and efficient.
Kata Travels
Manoj delivered our company website with exceptional attention to detail and professionalism. The website reflects our brand perfectly, provides a seamless user experience, and was completed within the agreed timeline. His technical expertise and responsiveness made the entire process smooth and efficient.
ZOQQ
Manoj delivered our company website with exceptional attention to detail and professionalism. The website reflects our brand perfectly, provides a seamless user experience, and was completed within the agreed timeline. His technical expertise and responsiveness made the entire process smooth and efficient.
Clients
Frequently asked questions
Manoj Mandal (also known as Manoj Kumar Mandal, or online as techieonvacation) is a Sr. Full Stack & AI Engineer based in New Delhi, India. He has 3+ years of professional experience building scalable web applications and AI-powered products, currently working as a Software Development Engineer at Unified Credit Solutions Pvt Ltd (fintech).
His full name is Manoj Kumar Mandal. He is professionally known as Manoj Mandal and goes by the handle techieonvacation across GitHub, Twitter/X, and Instagram.
Manoj Mandal is a Sr. Full Stack & AI Engineer. He designs and builds end-to-end web applications — from database architecture and backend APIs to responsive frontends — and integrates AI/LLM capabilities (OpenAI, Anthropic Claude) and n8n automation workflows to help businesses operate smarter and ship faster.
Manoj specializes in: Frontend — React.js, Next.js, TypeScript, Tailwind CSS, shadcn/ui, Redux Toolkit; Backend — Node.js, Express.js, REST APIs, GraphQL, Prisma ORM; Databases — PostgreSQL, MongoDB, Redis; AI/Automation — OpenAI API, Anthropic Claude API, n8n, RAG systems, LangChain, Prompt Engineering; DevOps — Vercel, Google Cloud Platform, Docker, Git, CI/CD; Mobile — React Native, Expo.
Manoj Mandal is based in New Delhi, Delhi, India. He works primarily remotely and is open to both remote and hybrid opportunities in India and internationally.
Yes — Manoj is available for freelance and contract projects. He offers full-stack web development, Next.js development, AI automation integration, mobile app development, and performance/SEO optimization. Reach him at manojkumarcse432@gmail.com or through the contact form on this site.
techieonvacation is Manoj Mandal's personal developer brand and online handle. It's the name he uses on GitHub (github.com/techieonvacation), Twitter/X (@techieonvacation), and Instagram. He also runs techieonvacation.com — a tech community and blogging platform he built himself.
Manoj currently works as a Software Development Engineer at Unified Credit Solutions Pvt Ltd, a fintech company specializing in credit and financial solutions, where he has been since April 2023. Before that, he was an SDE at Eleserv Softech Pvt Ltd (Oct 2022 – Jul 2023) and an Intern SDE at Sparx IT Solutions Pvt Ltd (Mar 2022 – Sep 2022).
Manoj holds a Bachelor of Technology (B.Tech) in Computer Science & Engineering from Tula's Institute of Technology (affiliated with Uttarakhand Technical University), Dehradun, India — graduating in 2022.
Manoj offers: integration of OpenAI GPT-4o and Anthropic Claude APIs into web applications; AI-powered chatbots and virtual assistants; Retrieval-Augmented Generation (RAG) pipelines with vector search; n8n and Make.com automation workflows connecting Slack, GitHub, CRMs, and custom APIs; prompt engineering; and intelligent data-processing pipelines that reduce manual work by hours per week.
You can reach Manoj through the contact form on this site (/contact), by email at manojkumarcse432@gmail.com, on LinkedIn (linkedin.com/in/manojkumarmandal), or on GitHub (github.com/techieonvacation). For a quick conversation use the 'Start a conversation' button in the services section.
Manoj has 3+ years of professional experience (since March 2022), spanning internships and full-time roles across fintech, software services, and IT companies. He has been actively coding since 2019 during his B.Tech studies.