Harwinder S.

Full Stack Developer | SaaS & API Development | PHP, Laravel, React

Building, finishing, or scaling a SaaS product, MVP, or business web application? I’m a Full Stack Developer helping founders, product teams, and agencies ship production-ready SaaS applications with Laravel, React, API development, and integrations. My approach combines SaaS product engineering + full-stack execution. I look at the product as one system; front-end, backend, database, authentication, billing, APIs, integrations, deployment, performance, and maintainability; so features work together reliably in production, not only in isolation. 𝐒𝐀𝐀𝐒 and 𝐅𝐔𝐋𝐋 𝐒𝐓𝐀𝐂𝐊 𝐃𝐄𝐕𝐄𝐋𝐎𝐏𝐌𝐄𝐍𝐓 • SaaS MVP Development: turn an idea, prototype, or unfinished product into a production-ready web application • Laravel / PHP Development: backend architecture, business logic, authentication, permissions, REST APIs, and application workflows • React / Next.js Development: responsive dashboards, portals, product interfaces, and data-driven frontend experiences • Multi-Tenant SaaS: tenant-aware workflows, user roles, role-based access control (RBAC), and subscription-based product features • Database Development: PostgreSQL, MySQL, and Supabase for application data, queries, and backend workflows 𝐀𝐏𝐈 𝐃𝐄𝐕𝐄𝐋𝐎𝐏𝐌𝐄𝐍𝐓, 𝐈𝐍𝐓𝐄𝐆𝐑𝐀𝐓𝐈𝐎𝐍𝐒 and 𝐁𝐈𝐋𝐋𝐈𝐍𝐆 • REST API Development: APIs for SaaS products, web applications, dashboards, and internal systems • API Integration: connect third-party platforms, external services, and existing application workflows • Stripe Integration: payments, Stripe Connect, and subscription billing for SaaS applications • Node.js / Express Development: backend services, API endpoints, and integrations 𝐄𝐗𝐈𝐒𝐓𝐈𝐍𝐆 𝐀𝐏𝐏𝐋𝐈𝐂𝐀𝐓𝐈𝐎𝐍𝐒, 𝐌𝐎𝐃𝐄𝐑𝐍𝐈𝐙𝐀𝐓𝐈𝐎𝐍 and 𝐏𝐄𝐑𝐅𝐎𝐑𝐌𝐀𝐍𝐂𝐄 • Existing Laravel / PHP Applications: add features, fix production issues, and improve maintainability • Legacy Application Modernization: refactor older code while preserving critical business workflows • Performance Optimization: diagnose slow application behavior, database/query issues, and backend bottlenecks • Ongoing Product Development: extend existing SaaS platforms, dashboards, APIs, and business applications 𝐇𝐎𝐖 𝐈 𝐖𝐎𝐑𝐊 • Understand the product, users, current codebase, workflows, and business goal • Identify technical constraints, risks, dependencies, and highest-priority work • Define the implementation approach across frontend, backend, database, and integrations • Build or improve approved features with maintainability and production use in mind • Test key application flows, permissions, integrations, and responsive behavior • Support deployment, stabilization, and the next development priorities 𝐖𝐇𝐘 𝐖𝐎𝐑𝐊 𝐖𝐈𝐓𝐇 𝐌𝐄 • Top Rated Plus on Upwork • 97% Job Success • $50K+ earned across Upwork projects • 25 jobs and 3,496 hours of Upwork delivery • Full-stack ownership across frontend, backend, APIs, databases, and application workflows • Experience with both new product builds and existing production applications I’m a strong fit for SaaS founders, product teams, and agencies that need to launch an MVP, build a custom SaaS application, add authentication or subscription features, integrate APIs or payments, modernize an existing Laravel application, or improve a production web app. Send me your product context, current challenge, technology stack, and desired outcome. I’ll help identify the highest-priority path forward and whether the work is best handled as a focused feature, modernization effort, or end-to-end build. --- 𝐂𝐎𝐑𝐄 𝐄𝐗𝐏𝐄𝐑𝐓𝐈𝐒𝐄: Full Stack Developer • SaaS Development • Web Application Development • Laravel • React • API Development • API Integration • RESTful API • Next.js • Node.js • TypeScript • PHP • PostgreSQL • Supabase • MySQL • User Authentication • Stripe Integration • Multi-Tenant SaaS • SaaS MVP Development • Performance Optimization