I help businesses build, improve, and maintain web applications that solve real business problems. Whether it's developing a custom web application, SaaS platform, landing page, business portal, integrating third-party APIs, automating workflows, implementing AI solutions, or maintaining an existing system, I focus on delivering reliable, scalable, and maintainable solutions.
Over the years, I've worked on startup MVPs, business applications, CRM systems, ERP integrations, payment gateway integrations, AI-powered workflows, Voice AI, backend automation, cloud-based solutions, and custom business software. I enjoy solving complex problems, improving existing applications, and building solutions that help businesses save time and operate more efficiently.
What I Can Help You With
• Custom Web Application Development
• SaaS Platform Development
• Landing Pages & Business Websites
• REST API Development & API Integration
• CRM & ERP Integrations
• Payment Gateway Integration
• AI Integration & Workflow Automation
• Voice AI & Auto Calling Solutions
• Twilio, Vapi, Retell AI & VoIP Integrations
• Admin Panels & Business Dashboards
• Database Design & Backend Development
• Performance Optimization
• Ongoing Maintenance
Backend
• PHP
• Laravel
• CakePHP
• CodeIgniter
• Zend Framework
• Symfony
• Golang
• Nodejs
• Expressjs
Frontend
• Reactjs
• Nextjs
• Vuejs
• JavaScript
• jQuery
• HTML5
• CSS3
• Bootstrap
• Tailwind CSS
Databases
• MySQL
• PostgreSQL
• MongoDB
• SQL / PL-SQL
• NoSQL
Cloud & DevOps
• AWS
• Google Cloud Platform (GCP)
• Docker
• Apache
• Git
• GitHub
• GitLab
• Bitbucket
API & Third-Party Integrations
• REST APIs
• GraphQL
• Webhooks
• Stripe
• PayPal
• Razorpay
• Paytm
• Google Pay
• HyperPay
• Flutterwave
• Twilio
• SendGrid
• HubSpot
• Zoho CRM
• GoHighLevel
• Meta APIs
• Google APIs
• Facebook APIs
• LinkedIn APIs
• X (Twitter) APIs
• PubNub
• CallRail
• Kixie
• WATI
• Wufoo
• HeyFlow
• REsimpli
• Apex Chat
• Tawk
AI & Automation
• OpenAI API
• ChatGPT API
• Claude API
• Gemini API
• Anthropic AI
• Make
• Zapier
• n8n
• AI Workflow Automation
• AI Agents
• Voice AI
• Vapi
• Retell AI
• OpenAI Realtime API
• Function Calling
• Webhook Automation
Additional Experience
• SocketIO
• Authentication (JWT & OAuth)
• API Versioning
• Cron Jobs
• Payment Processing
• CRM Development & Integrations
• SaaS Development
• Business Automation
• Landing Page Development
• WordPress Development
• Shopify Development
• Performance Optimization
• Debugging & Troubleshooting
• Maintenance & Support
I work across the complete software development lifecycle—from understanding business requirements and planning architecture to development, testing, deployment, and long-term maintenance. Whether it's building a new application, improving an existing system, integrating third-party services, developing AI-powered solutions, or solving complex technical challenges, I focus on writing clean, maintainable code and delivering software that's reliable, scalable, and built for long-term success.
Clear communication, attention to detail, and meeting deadlines are important to me. Whether you need a one-time implementation or a long-term development partner, I'd be happy to discuss your project and find the best approach.
I look forward to working with you.
PHP
Laravel
API Integration
RESTful API
Payment Gateway Integration
MySQL
PostgreSQL
MongoDB
JavaScript
React
Vue.js
Node.js
Amazon Web Services
Docker
Ecommerce Website Development
Third-Party Integration
Web Application Development
ExpressJS
Stripe
Pancham G.
Bathinda, India
$30/hr
4.9
130 jobs
I’m a Senior Java Backend Engineer with over 14 years of experience building mission-critical systems in fintech, with a strong focus on payments, lending platforms, and core banking solutions. I specialize in Java and Spring Boot, and design backend systems that are secure, scalable, and capable of handling high-volume financial transactions with consistency and reliability.
I’ve worked on systems involving payment processing, transaction workflows, loan management, and integrations with external financial services and APIs. This includes designing and building robust microservices architectures that support real-time and asynchronous processing, ensuring data accuracy, fault tolerance, and seamless service communication. I understand the importance of idempotency, transaction integrity, and failure handling in financial systems where even minor inconsistencies can have significant impact.
Security and compliance are central to my approach. I have strong experience implementing secure authentication and authorization using Spring Security, token-based systems, and role-based access control. I build APIs and backend services that align with financial industry expectations around data protection, auditability, and reliability.
From a technical standpoint, I bring deep expertise in Spring Boot, microservices, REST API design, JPA/Hibernate, and relational databases like MySQL and PostgreSQL. I’m comfortable designing systems from scratch as well as improving and scaling existing platforms, optimizing performance, and ensuring stability under load.
I also have hands-on experience with AWS and Google Cloud, and have worked on deploying and managing backend systems in cloud environments. I understand how to design cloud-ready architectures, implement CI/CD pipelines, and ensure systems are resilient, observable, and production-ready.
What sets me apart is my ability to think beyond just implementation. In fintech systems, correctness, reliability, and long-term maintainability matter more than quick fixes. I focus on building clean, well-structured systems that not only meet current requirements but are also prepared for future scale, regulatory needs, and product evolution.
If you’re building or scaling a payments platform, lending system, or core banking backend and need someone who understands both the technical and domain challenges, I’d be glad to contribute.
Java
J2EE
Spring Framework
Spring Boot
Spring Security
Hibernate
Java Persistence API
RESTful API
Microservice
FinTech
Payment Processing
AI Implementation
SQL Programming
Desktop Application
Swing
iText
Unit Testing
Cloud Computing
Amazon Web Services
Google Cloud Platform
Krunal P.
Vadodara, India
$60/hr
5.0
6 jobs
​Is your technology becoming a bottleneck to your business growth? Or do you need to architect a scalable enterprise system from the ground up?
​I am a Senior Software Architect and Technical Lead. I act as a strategic partner to businesses.
Over the last 13+ years, I’ve worked across the full stack—from legacy modernization to modern Node.js/TypeScript applications, API integration, Payment Integration, and custom AI integrations.
​I provide the technical leadership required to:
• Architect scalable enterprise systems from the ground up.
• Integrate GenAI/LLM capabilities with strict data validation.
• Modernize legacy systems with minimal business downtime.
• Stabilize critical integrations for high-volume traffic.
​PROVEN BUSINESS OUTCOMES:
• Revenue Infrastructure: Architected high-volume checkout engines processing multi-million dollar annual transactions, integrating UltraCart and Ontraport to secure recurring revenue.
• Engineering Leadership: Scaled an agency engineering department to 10+ developers as Lead Architect, cutting development cycles by 30% through reusable base architectures.
• Ecosystem Orchestration: Engineered secure API bridges and webhooks to unify global marketing data across HubSpot, Google Workspace, and custom backends.
• Enterprise Data Migration: Executed a flawless, zero-data-loss migration of an enterprise helpdesk, securely transferring 200,000+ historical support threads to self-hosted infrastructure.
• Advanced Integrations & AI: Built specialized Stripe payment routing engines, and embedded GenAI (Google Gemini) pipelines into EdTech platforms with strict JSON schema validation to eliminate model hallucinations.
​CORE TECH STACK:
• Backend: Node.js, TypeScript, REST APIs, Webhooks, PHP
• Frontend: React, Angular
• Data & Cloud: PostgreSQL, Redis, BullMQ, Docker
• Integrations: Stripe API, Google Workspace, Gemini AI / LLMs
​
HOW I WORK:
I step in when off-the-shelf solutions fail or legacy systems become too fragile. I take total project ownership—delivering the research, architecture, and implementation plans so leadership doesn't have to worry about technical execution.
​Most importantly, I am careful with other people's money and data, and I build infrastructure strictly designed to protect both.
​If you are looking for an architect to permanently eliminate your technical debt, let's schedule a consultation.
Full-Stack Development
Software Architecture
Web Application
REST API
Back-End Development
Angular
React
Node.js
ExpressJS
TypeScript
Generative AI
Google Apps Script
API Integration
PostgreSQL
Payment Gateway Integration
HubSpot
Ontraport
Tailwind CSS
Bootstrap
Stripe API
Sukhpreet S.
Mohali, India
$15/hr
5.0
9 jobs
I help businesses turn ideas into fast, reliable web applications — from e-commerce platforms and CRMs to custom dashboards and API integrations.
Core stack:
Backend: Laravel/PHP, Node.js, Express.js
Frontend: React.js, Next.js, Vue.js
Databases: MySQL, MongoDB (including optimization for large datasets)
Integrations: HubSpot, Shopify, ShipStation, QuickBooks, Asana, AWS
Recent work includes building an admin portal from scratch in Laravel, deploying a Next.js app with Clerk authentication, and integrating the ShipHero API for an e-commerce operation.
Before freelancing full-time, I worked as a Software Developer at DRDO (India's Defence Research and Development Organisation), where I built and optimized backend systems and databases — experience that shaped how I approach clean, secure, scalable code today.
What you can expect:
Clear, proactive communication (0–4 hour response time)
Code that's documented and easy to hand off
A developer who thinks about your business goals, not just the ticket
Let's talk about what you're building — I'd love to help bring it to life.
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