Senior Full Stack Engineer | React · Next.js · Node.js · NestJS · AI Integration
Full Stack Engineer with 6+ years delivering production applications across fintech, healthcare, immigration tech, and edtech. I specialize in building scalable systems that solve real business problems.
const david = {
location: "Port Harcourt, Nigeria (UTC+1)",
focus: ["Full Stack Development", "AI Integration", "System Architecture"],
currentlyBuilding: "AI-powered immigration and compliance tools",
openTo: "Senior engineering roles (remote or relocation)"
};- Production Experience: Shipped 10+ applications serving real users — from fintech platforms processing daily transactions to telemedicine systems handling patient consultations
- AI Integration: Hands-on experience with OpenAI, LangChain, RAG pipelines, and semantic search in commercial products
- Full Ownership: Comfortable owning projects from architecture design through deployment and maintenance
- Mentorship: Trained 100+ developers, with many now working as professional engineers
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Most of my production work is under NDA. Below are live products I've built or contributed to significantly.
| Project | Description | Stack |
|---|---|---|
| VizaCheck | Visa screening platform that analyzes applications, documents, and social profiles to flag rejection risks before embassy submission | Next.js, Node.js, PostgreSQL, AI |
| VeriPass | Legal-tech platform mapping applicant profiles to merit-based visa pathways (O-1A, EB-1A, UK Global Talent) | Next.js, Node.js |
| VettStream | B2B social media vetting and visa risk assessment for immigration consultants | Next.js, LangChain, PostgreSQL |
| Project | Description | Stack |
|---|---|---|
| Expatdoc Online | Telemedicine platform connecting patients in Ireland with licensed doctors — web + mobile | Next.js, React Native, Node.js |
| MedFind | AI-powered medication search connecting patients to pharmacies across Nigeria | React, Node.js, MongoDB, OpenAI |
| Project | Description | Stack |
|---|---|---|
| OrderPay | Instant bill payments platform (airtime, data, electricity, cable TV) serving Nigerian users daily | React, Node.js, MongoDB, Paystack |
| CareerEx | Tech career training platform with live mentorship and cohort management | Next.js, NestJS, PostgreSQL, AWS |
| SchoolAxis | University access platform connecting African students to institutions abroad | Next.js, Node.js, PostgreSQL |
I document my architectural decisions and technical approaches:
- Building a Visa Risk Scoring Engine — How I designed an AI system to analyze applications against embassy rejection patterns
- Scaling a Fintech Platform with Redis — Reducing API response times through caching and query optimization
- Architecting a Multi-Tenant EdTech Platform — Database design for concurrent cohorts with isolated data
→ See my Case Studies Repository for detailed write-ups
| Repository | Description |
|---|---|
| nextjs-nestjs-starter | Production-ready monorepo template with Next.js 14 + NestJS + PostgreSQL + Docker |
| ai-rag-template | RAG pipeline starter with LangChain, OpenAI, and vector database integration |
| react-native-starter | React Native template with authentication, navigation, and API integration patterns |
I'm open to senior engineering roles — fully remote or with visa sponsorship for relocation to Europe, UK, or Canada.
- Portfolio: davidsampson.vercel.app
- Email: davidsampson.ud@gmail.com
- Location: Port Harcourt, Nigeria (WAT, UTC+1)
"I build software that helps businesses scale — from architecture to deployment."