Senior Full Stack & AI Engineer

Ufong Wong

Senior Full Stack & AI Engineer

Amsterdam, Netherlands ************@*****.*** github.com/ufongwong-devwizard

SUMMARY

Senior Full Stack & AI Engineer with 9+ years of experience building scalable SaaS platforms, production LLM applications, RAG-based knowledge systems, AI workflow automation, and distributed backend services. Strong expertise in Python, Django, FastAPI, React, Next.js, TypeScript, cloud-native engineering, and secure API architecture. Proven ability to lead engineering teams, modernize legacy systems, improve platform performance, and deliver reliable AI-powered products from concept to production.

PROFESSIONAL EXPERIENCE

BluePeak Technologies Amsterdam, Netherlands Remote Contract Completed

Senior Full Stack & AI Engineer May 2022 - Apr 2026

• Led architecture and development of enterprise SaaS and AI-powered platforms using Python, Django, FastAPI, React, Next.js, TypeScript, PostgreSQL, Redis, and Azure.

• Designed production LLM workflows for summarization, classification, entity extraction, document comparison, and support-response drafting using retrieval grounding, structured outputs, fallback prompts, and human review checkpoints.

• Built RAG pipelines covering document ingestion, chunking, embeddings, metadata filtering, vector retrieval, context assembly, prompt execution, and answer validation using pgvector, Qdrant, Pinecone, and Elasticsearch-backed search patterns.

• Developed an enterprise knowledge assistant that indexed 80,000+ internal documents, supported 1,500+ internal users, and reduced repeated support questions by 35%.

• Launched AI-powered document intelligence workflows that reduced manual document review effort by 55% based on internal workflow tracking.

• Improved AI reliability and cost efficiency through source-aware responses, structured JSON outputs, prompt regression checks, retrieval-quality validation, token usage monitoring, caching, and model-selection strategies.

• Led a cross-functional team of 7 engineers across backend, frontend, and QA, owning architecture, sprint planning, code reviews, mentoring, delivery standards, and production readiness.

• Supported 1M+ monthly API requests, improved API response times by 40%+, and strengthened security and deployment reliability using OAuth, JWT, RBAC, Docker, Kubernetes, GitHub Actions, and Azure CI/CD.

Core Technologies: Python, Django, FastAPI, React, Next.js, TypeScript, PostgreSQL, Redis, Celery, Docker, Kubernetes, Azure, OpenAI API, Claude API, LangChain, pgvector, Qdrant, Pinecone, Elasticsearch

HarbourSoft Limited Remote

Senior Full Stack Engineer Aug 2020 - Jan 2022

• Modernized legacy enterprise applications by migrating monolithic systems to Python, Django, React, Next.js, and modular service-based architectures.

• Designed secure REST and GraphQL APIs for ERP, CRM, inventory, reporting, approval workflows, account management, and customer portal systems.

• Improved backend performance through SQL optimization, database indexing, Redis caching, service-layer refactoring, and asynchronous processing.

• Built reusable React and Next.js components, dashboards, form systems, and role-based interfaces to reduce repeated frontend development work.

• Implemented secure authentication and authorization using JWT, OAuth, RBAC, session handling, input validation, and permission-based access controls.

• Mentored 4 engineers through architecture reviews, code reviews, testing practices, reusable engineering patterns, and production-readiness standards.

Core Technologies: Python, Django, React, Next.js, TypeScript, PostgreSQL, MySQL, Redis, Docker, REST APIs, GraphQL, JWT, OAuth, Linux, Nginx, CI/CD

EastBridge Software Limited Remote

Full Stack Software Engineer Apr 2017 - Jun 2020

• Built full stack web applications, customer portals, booking systems, admin dashboards, and business workflow tools using Python, Django, JavaScript, React, PostgreSQL, and MySQL.

• Developed backend modules for user management, reporting, content management, notifications, payment workflows, third-party API integrations, and internal automation.

• Designed relational database schemas and improved SQL performance through indexing, query tuning, and cleaner data modeling.

• Supported production applications by resolving bugs, improving performance, monitoring system behavior, and strengthening application security.

Core Technologies: Python, Django, JavaScript, React, PostgreSQL, MySQL, REST APIs, HTML5, CSS3, Git, Linux, Docker

SELECTED AI SYSTEMS

Enterprise RAG Knowledge Assistant

• Built an internal AI assistant for retrieving policies, technical documentation, support articles, and operational knowledge using document ingestion, embeddings, metadata filtering, and vector search.

• Added source-aware answers, fallback responses, confidence handling, retrieval-quality checks, and human review paths for uncertain or sensitive outputs.

AI Document Intelligence Workflow

• Designed AI workflows for document summarization, entity extraction, classification, comparison, and support-response drafting.

• Combined LLM APIs, structured outputs, prompt templates, queue-based processing, usage monitoring, prompt regression checks, and human review checkpoints.

EDUCATION

Bachelor of Science in Computer Science

Hong Kong Polytechnic University Hong Kong

SKILLS

AI Engineering: LLM applications, RAG pipelines, embeddings, vector search, semantic search, hybrid search, metadata filtering, prompt engineering, structured outputs, function calling, tool calling, AI agents, document intelligence, enterprise search, hallucination reduction, LLM evaluation, prompt testing, AI observability, token optimization, model fallback strategies

AI Tools: OpenAI API, Claude API, LangChain, pgvector, Pinecone, Qdrant, FAISS, Elasticsearch, GitHub Copilot, ChatGPT, Cursor

Backend: Python, Django, FastAPI, Node.js, Express.js, REST APIs, GraphQL, microservices, distributed systems, Celery, background jobs, asynchronous processing, event-driven architecture, webhooks, rate limiting, API performance optimization

Frontend: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux Toolkit, Zustand, TanStack Query, React Hook Form, Zod, Material UI, responsive UI, dashboard development, component architecture

Database and Search: PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch, Firebase, Supabase, schema design, indexing, SQL optimization, caching, JSON processing

Cloud and DevOps: Docker, Kubernetes, Azure, GitHub Actions, Linux, Nginx, CI/CD, release automation, production monitoring, deployment reliability

Security and Quality: OAuth, JWT, RBAC, IAM concepts, SSO concepts, API security, input validation, audit logging, secure data access, unit testing, integration testing, API testing, code review, technical documentation

Leadership: Architecture ownership, technical roadmaps, sprint planning, mentoring, engineering standards, cross-functional collaboration, product-focused engineering

Contact this candidate