Brijesh T.

Top Rated Plus | $500K+ earned on Upwork | 135 completed jobs. I run Differenz System, a full-stack team that builds SaaS platforms, mobile apps and the integrations that connect them, with 15+ years of experience delivering for startups and businesses across healthcare, finance, logistics and e-commerce. What we build: ➜ SaaS platforms: subscriptions, dashboards, admin panels, APIs ➜ Finance and operations integrations: QuickBooks, Xero, SAP, Stripe, DocuSign, Twilio ➜ AI features: voice agents, LLM workflows, automation ➜ Mobile apps: Flutter, React Native, iOS, Android ➜ Custom CRMs and internal tools Products we've built and run: ◆ Quick Receivable and Quick Payable: our own receivables and payables SaaS, with AI voice agents and accounting integrations ◆ Byzly: payment orchestration and consumer financing for high-ticket purchases ◆ Pause a Moment: emotional-health training platform for healthcare workers ◆ PaSeva and oDoc: HIPAA-compliant healthcare apps ◆ Glammer, Playwaze and WalknTours: booking, sports and travel apps live in the stores Tech stack: React, Next.js, Node.js, NestJS, Python/Django, Laravel, .NET, Flutter, React Native, PostgreSQL, Supabase, MySQL, Firebase, AWS How we work: - Clear milestones and timelines - Weekly progress updates - Clean, documented code - Long-term support, and we also take over and stabilize existing apps Building a SaaS, an integration-heavy platform or a mobile app? Let's talk.