Vikram Singh

VIKRAM SINGH HANDA Full Stack Developer | Team Lead | Backend & System Design | AI Application Engineer Mohali, India •-• - • LinkedIn • Portfolio / Live Project PROFESSIONAL SUMMARY Full-Stack & AI Application Engineer with 12+ years of experience building scalable, production-grade web platforms. Expert in backend-heavy development using Node.js (NestJS), PHP, and React, with deep experience in RESTful APIs, microservices, CRM systems, Stripe/Razorpay/PayPal payment integrations, and real-time applications. Proven track record leading cross-functional teams, architecting high-availability systems, and delivering AI-powered SaaS platforms. Strong in system design, RBAC, CI/CD pipelines, and Docker-based deployments on AWS. CORE TECHNICAL SKILLS Languages JavaScript (ES6+), TypeScript, PHP, Python (basic) Frontend React.js, Next.js, AngularJS, HTML5, CSS3, Tailwind CSS Backend Node.js, NestJS, Express.js, Laravel, Zend Framework Databases MySQL, MongoDB, Redis, Elasticsearch, PostgreSQL Cloud & DevOps AWS (EC2, S3, RDS), Docker, Kubernetes, CI/CD (Bitbucket Pipelines) Payments Stripe, Razorpay, PayPal, CCAvenue — checkout, webhooks, subscriptions AI / LLM OpenAI API, Anthropic Claude API, Groq/Llama, Prompt Engineering, RAG, AI Chat Systems Architecture Microservices, RESTful APIs, WebSockets, RBAC, System Design, High Availability Tools & Process Git, Bitbucket, Jira, Agile/Scrum, Code Review, Team Mentoring PROFESSIONAL EXPERIENCE R&D Lead / Team Lead | Aboxlab IT Solutions Dec 2022 – Feb 2026 CRM, immigration & visa processing platforms, AI SaaS products • Architected and led development of a multi-tenant CRM platform for immigration/visa processing with lead tracking, agent management, onboarding workflows, and full lifecycle management — reducing manual CRM work by 40%. • Designed and built RESTful APIs consumed by web, mobile, and B2B partner applications using Node.js (NestJS) and TypeScript; implemented JWT-based auth with RBAC. • Integrated Stripe, Razorpay, PayPal, and CCAvenue payment gateways including subscription billing, webhook handlers, refunds, and commission settlement for agent payouts. • Built a Generative AI SaaS platform (MiccrAI) using OpenAI and Groq/Llama APIs, featuring context-aware multi-turn chat, document Q&A, and prompt engineering pipelines. • Developed real-time notification and messaging systems using WebSockets (Socket.io), enabling live agentclient communication and status updates. • Designed commission management engine for automated agent payout calculations, dispute handling, and reconciliation reports. • Led a team of 6 engineers: conducted code reviews, enforced coding standards, managed sprint planning in Jira, and mentored junior developers. • Dockerized all backend services and established CI/CD pipelines via Bitbucket Pipelines, deploying to AWS (EC2, S3, RDS). • Tech Stack: Node.js (NestJS), TypeScript, React.js/Next.js, MySQL, MongoDB, Redis, AWS, Docker, Stripe, OpenAI API, Groq, WebSockets. Senior Software Engineer | Softobiz Technologies Pvt. Ltd. Sep 2019 – Oct 2022 ClientPoint — cloud-based Sales Enablement Automation platform (200+ enterprise clients) • Contributed to and enhanced ClientPoint, a B2B SaaS platform enabling enterprise sales teams to build interactive proposals, e-brochures, pricing modules, and contracts. • Delivered full-stack features across the Node.js backend and React.js / AngularJS frontend; also contributed to Zend Framework and Laravel services. • Improved platform performance and scalability — reduced key API response times by 30% through query optimization and Redis caching strategies. • Built configurable pricing module with dynamic pricing rules, discount tiers, and approval workflows for 200+ enterprise accounts. • Integrated e-signature workflows, PDF generation pipelines, and CRM sync APIs (Salesforce, HubSpot). • Collaborated closely with product and QA teams in an Agile/Scrum environment with 2-week sprints. • Tech Stack: Node.js, React.js, AngularJS, Zend Framework, Laravel, MySQL, Redis, AWS. Technical Team Lead | Leftclick IT Services Pvt. Ltd. Apr 2017 – Aug 2019 POS systems and backend APIs for 8+ retail & hospitality clients • Led backend development for Point-of-Sale systems processing 50,000+ monthly transactions across 8+ clients, improving transaction speed by 25%. • Designed and built scalable REST APIs for inventory management, order tracking, loyalty programs, and reporting dashboards. • Integrated multiple payment gateways into POS flows; handled reconciliation, transaction logging, and audit trails. • Managed end-to-end delivery: requirements gathering, architecture, development, testing, and client deployment. • Tech Stack: PHP, MySQL, React.js, REST APIs. Software Engineer | Techmind Softwares Jul 2013 – Mar 2017 Full SDLC delivery across 12+ web applications • Contributed across the full software development lifecycle for 12+ client projects including ERP modules, inventory systems, and e-commerce platforms. • Built backend services and client-server applications in PHP (CodeIgniter, core PHP), MySQL, and jQuery. • Gained foundational expertise in database design, server-side logic, API development, and client delivery. KEY PROJECTS MiccrAI — Generative AI SaaS Platform | Live: miccorai.up.railway.app • Built end-to-end AI SaaS platform with multi-LLM support (OpenAI GPT-4o, Groq/Llama 3, Claude) featuring multi-turn context management, system prompt customization, and document Q&A. • Implemented RAG pipeline for document-aware conversations — users upload PDFs/docs, and the system retrieves relevant context chunks before generating responses. • Built subscription billing with Stripe Checkout, webhooks for payment lifecycle events, and credit-based usage metering per model/token. • Deployed on Railway (backend) + Vercel (frontend) with Docker containerization and environment-based config management. • Tech: Node.js (NestJS), React.js, OpenAI API, Groq API, Stripe, PostgreSQL, Redis, Docker. Immigration & Visa CRM Platform (Aboxlab) • Designed multi-tenant CRM handling the full visa application lifecycle: lead capture, document collection, case assignment, status tracking, approval workflows, and client communication. • Built B2B partner API layer allowing third-party agents to submit, track, and manage cases programmatically via authenticated REST endpoints. • Implemented commission management system: configurable commission rules per agent/tier, automated payout calculations, dispute workflow, and settlement reporting. • Integrated Stripe and Razorpay for subscription plans and one-time processing fees; built webhook handlers for payment confirmation, failure retries, and refunds. • Tech: Node.js (NestJS), TypeScript, React.js/Next.js, MySQL, Redis, AWS EC2/S3/RDS, Docker, Stripe, Razorpay, WebSockets. ClientPoint — Sales Enablement Platform (Softobiz) • Contributed to a cloud B2B SaaS platform serving 200+ enterprise clients with interactive proposals, dynamic pricing, contract management, and e-signature workflows. • Built the configurable pricing module with discount tiers, approval gates, and role-based visibility — used by enterprise sales teams to generate quotes in real time. • Developed CRM sync integrations with Salesforce and HubSpot; built PDF/HTML proposal generation pipeline using Puppeteer. • Tech: Node.js, React.js, AngularJS, Zend Framework, MySQL, Redis, AWS. POS & Transaction Processing Platform (Leftclick) • Architected POS backend processing 50,000+ monthly transactions for 8+ retail/hospitality clients with inventory sync, loyalty programs, and real-time reporting. • Reduced transaction processing latency by 25% through query optimization, connection pooling, and caching. • Built multi-gateway payment integration (card, UPI, wallet) with reconciliation, refund handling, and daily settlement reports. • Tech: PHP, MySQL, React.js, REST APIs, Redis. KEY IMPACT & METRICS • • • • • Reduced manual CRM processing time by 40% through workflow automation and intelligent lead routing. Improved API response performance by 30% via query optimization, indexing, and Redis caching strategies. Built and maintained systems handling 50,000+ monthly financial transactions with 99.9% uptime. Led and mentored teams of 4–6 engineers across backend, frontend, and DevOps functions. Delivered 12+ full-cycle projects across CRM, e-commerce, POS, AI SaaS, and fintech domains. DOMAIN EXPERTISE CRM & Lead Management • FinTech & Payment Gateways • B2B Platforms & Commission Systems • RealTime & Event-Driven Architecture • AI / Generative AI SaaS • Immigration & Visa Processing • E-Commerce & POS Systems DEVOPS & DEPLOYMENT • Dockerized microservices with multi-stage builds; orchestrated with Docker Compose and Kubernetes. • Set up CI/CD pipelines with Bitbucket Pipelines: automated test → build → deploy workflows. • AWS deployments: EC2 (app servers), RDS (MySQL/PostgreSQL), S3 (file storage/CDN), CloudFront, Route 53. • Environment management: staging/production separation, secrets management, blue-green deployment patterns. EDUCATION MCA (Master of Computer Applications) - Punjab Technical University MSc (Information Technology) - Khalsa College, Patiala PGDCA Modi College, Patiala -