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LIN S. — Mid-Level Full-Stack Developer from Singapore

LIN S.

Mid-Level Full-Stack Developer

Singapore 1-2 years
Open to offersNew to Platform
Languages
EnglishChinese
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About

Lin S. is a highly skilled Full-Stack Developer based in Singapore, specializing in AI-powered SaaS products with a focus on deploying applications from initial code to live, paying customers. He independently designs, builds, and deploys production applications using Next.js, Supabase, and Stripe, crafting solutions like AI marketplaces, fintech signal platforms, and B2B sales-agent tools. These applications are equipped with real infrastructure, including live payment processing, authentication, and analytics. An autodidact, Lin S. honed his skills by developing practical products used by real customers. As an independent developer, he handles everything from product conception to launch and maintenance, ensuring each feature undergoes rigorous live-environment testing. His notable projects include the AI Talent Marketplace, SynergySynth AI, the AI Pet Emotional-Intelligence SaaS, AnimaSense, and the AI Trading Signal SaaS, QuantGold AI. He emphasizes Internationalization, technical SEO, and ensuring robust security measures across his platforms.

Experience

  • Full-Stack Developer

    Independent · 2024 — Present
    Designed, built, and shipped production SaaS applications entirely on my own. Managed the complete lifecycle from specifications to live launch, covering architecture, database schema, user interface implementation, third-party integrations, security enhancements, and post-launch monitoring. Ensured every feature underwent testing against live infrastructure before completion.

  • AI Talent & Model Marketplace SaaS

    SynergySynth AI
    Developed a marketplace that connects AI talent and models with clients, featuring real Stripe billing, admin authentication, and automated onboarding email sequences. Implemented secure server-side admin sessions and a drip email campaign that operates via a scheduled job. Achieved comprehensive coverage through automated tests addressing billing logic, email delivery, and admin authentication.

  • AI Pet Emotional-Intelligence SaaS

    AnimaSense
    Launched an AI-driven pet behavior analysis platform that links pet owners with certified specialists and incorporates Stripe subscription billing. Developed client-side audio and video feature extraction that feeds a server-side stress and anxiety detection pipeline, creating a secure data-sharing method for veterinarians without needing accounts. Remediated a real IDOR vulnerability in specialist-request handling and managed domain, SSL, and email routing configurations.

  • AI Trading Signal SaaS

    QuantGold AI
    Created a rules-based trading signal engine that provides real-time XAU/USD signals via email, Telegram, and Web Push, utilizing live market data. Incorporated risk-managed position sizing, conducted multi-timeframe trend analysis, and built a performance dashboard that differentiates between backtested and live results. Integrated Stripe Checkout with a trial period, orchestrating webhook-driven subscription synchronization.

  • Autonomous B2B Sales Agent SaaS

    OmniSales AI
    Established an AI sales-agent platform that integrates Claude for real-time customer chat, ensuring per-tenant Stripe billing. Maintained multi-tenant data isolation using Postgres Row-Level Security and set up a service role-gated metrics endpoint for authorized access. Developed a full suite of automated tests and a supportive onboarding email sequence.

  • Multi-Portal Points & Deposit Platform

    Marketplace MVP
    Constructed a three-portal marketplace implementing a points-based economy and tiered top-up packages along with deposit withdrawal and refund workflows. Delivered internationalization in English, Mandarin, and Vietnamese across all portals.