Work Experience
Proven delivery across FinTech, EdTech, e-commerce, healthcare, and AI/LLM products, including LLM integration, AI model training workflows, prompt engineering, and model evaluation.
Senior Frontend Engineer
Independent / Freelance
Own end-to-end frontend delivery for international SaaS, FinTech, EdTech, and e-commerce clients across multiple time zones. Convert Figma and Adobe XD designs into production-ready component systems, modernize legacy apps into Next.js, and ship AI/LLM integration, AI training/evaluation workflows, prompt engineering, and model evaluation for production LLM features.
Technologies Used
Key Achievements
- Delivered production web apps as sole frontend owner for clients across the US, UK, Canada, South Korea, and the Middle East
- Increased e-commerce checkout conversion by streamlining Stripe, PayPal, Kakaopay, and Naver Pay payment flows
- Redesigned an AI-assisted booking workflow with conversational hotel discovery, automated comparison, personalized recommendations, and reservation requests
- Developed AI training and evaluation workflows for LLM-powered features: prompt iteration, response evaluation, and improving AI outputs based on application requirements
- Migrated a legacy Vue.js platform to Next.js, improving performance and SEO while preserving region-specific payment parity
- Shipped production chatbots and AI agents with streaming LLM responses via the Vercel AI SDK
Senior Frontend Engineer
Pansuriya Infotech
Developed and maintained React.js and Next.js applications for international clients with direct stakeholder communication. Designed reusable component libraries and responsive UI for greenfield SaaS products from wireframes.
Technologies Used
Key Achievements
- Lifted e-commerce checkout conversion by integrating Stripe and PayPal gateways for international clients
- Slashed an EdTech platform's load time from minutes to seconds and grew its SEO ranking
- Launched real-time learning features including WebRTC video, collaborative whiteboard, and live chat
- Established CI/CD pipelines automating build, test, and deployment across client products
Senior Frontend Engineer
DataOne Innovation Labs
Partnered with design, data science, and backend teams to integrate REST APIs and ship production React.js UI in an Agile 15-person startup. Owned greenfield SaaS product development and mentored junior engineers.
Technologies Used
Key Achievements
- Delivered the majority of UI integration for the company's flagship multi-user SaaS product
- Architected a config-driven FinTech banking platform using micro-frontend architecture and module federation
- Built a configuration-driven UI engine (forms, navigation, pages) that let non-engineers ship screens without code
- Mentored interns and onboarded junior engineers on React and Git standards
Industry Expertise
FinTech & Banking
Config-driven banking platforms, digital asset & crypto trading interfaces, and secure payment flows
EdTech & E-learning
Group video lessons (WebRTC), collaborative whiteboards, live chat, and SEO-optimized learning platforms
E-commerce & Analytics
Storefronts, checkout optimization, and analytics dashboards unifying multiple e-commerce platforms
Healthcare & Hospital
Patient-facing portals, dashboards, and hospital management interfaces with secure access control
Marketplace & Booking
AI-assisted booking workflows with conversational hotel discovery, automated comparison, personalized recommendations, and reservation requests
AI & LLM Products
LLM integration, AI training/evaluation workflows, prompt engineering, and model evaluation for production AI features
Crowdfunding & VC
Crowdfunding platforms and VC fundraising tools connecting founders, GPs, and LPs
E-auction
Real-time auction platforms with live bidding interfaces and responsive dashboards
SaaS & Enterprise
Multi-user SaaS products, admin panels, and micro-frontend architectures with module federation
Key Capabilities
Performance Optimization
Load times cut from minutes to seconds, Core Web Vitals (FCP, LCP) tuning, and Lighthouse & SEO gains
AI/LLM Integration
LLM integration, production chatbots, AI agents, and RAG/semantic search with OpenAI, Anthropic Claude, and the Vercel AI SDK
AI Training & Evaluation
AI model training workflows, prompt engineering, model evaluation, prompt iteration, and improving LLM outputs for production apps
Payments & Integrations
Stripe, PayPal, Kakaopay, and Naver Pay flows, plus REST API and Next.js API-route integration
Scalable Architecture
Micro-frontend architecture, module federation, config-driven UI, and reusable component libraries
Remote Global Delivery
Clients in the US, UK, Canada, South Korea, and the Middle East with strong US/EU timezone overlap
Mentoring & Collaboration
Mentored interns and junior engineers, code reviews, and cross-functional work with design, backend, and data teams
Ready to Work Together?
With proven experience across multiple industries and AI/LLM integration work, I can help with React/Next.js frontend, AI training and evaluation, prompt engineering, and model evaluation.