Senior Fullstack & Platform Engineer

Engineering secure, scalable platforms.

5+ years designing production-grade systems across health-tech, fintech, SaaS, and developer tooling — with deep expertise in TypeScript, Rust, Python, PostgreSQL, and distributed architecture.

Distributed Systems
Backend Architecture
TypeScript / NestJS
Rust (Axum)
AI Agents & RAG
Platform Engineering
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Projects where architecture met business impact.

Platform

HIPAA-Compliant Health Platform

Led end-to-end delivery of a HIPAA-compliant health-tech platform and secure document processing system — designing custom middleware for PII detection, request threat analysis, and malicious payload filtering across production workflows.

Role: Lead Fullstack Engineer — Theraptly

50%Faster release cycles
60%Fewer unauthorized attempts
99.9%Transaction reliability
NestJSRedisStripePaystackDockerGitHub Actions
AI / ML

High-Concurrency Rust Microservices

Developed production-grade Rust microservices (Axum, Tokio) handling authentication and payment workflows with async PostgreSQL connection pooling. Built a RAG & semantic search service enabling retrieval over thousands of documents with optimized LLM context windows.

Role: Software Engineer — HNG / Telex (2× Finalist)

1k+Documents indexed
ZeroDowntime search
AsyncConnection pooling
RustAxumTokioSQLxChromaDBTauri 2
Security

Multi-Platform Community & Payment System

Designed and built a multi-platform community management system with banking-grade 2FA (TOTP), automated onboarding and moderation, and global payment processing with cryptographic webhook verification to prevent replay attacks.

Role: Backend Engineer — Sparkly

50%Engagement increase
40%Reduced DB load
2FABanking-grade auth
TypeScriptRedisStripeFlutterwaveTOTPJWT
Infrastructure

Secure E-Commerce Platform

Built a secure e-commerce platform serving military and security agencies with session management, XSS mitigation, and integrated payment flows — handling 10k+ daily users on AWS infrastructure with Redis session caching.

Role: Backend Engineer — Techivate

10k+Daily users
30%Checkout improvement
50%Latency reduction
Node.jsExpressStripePaystackAWS EC2Redis

A track record of increasing scope.

2025 — Present

Lead Fullstack Engineer

Theraptly — Health-Tech Platform

Lead engineering for a HIPAA-compliant health-tech platform and secure document processing system. Own backend architecture, frontend delivery, and infrastructure automation across production environments.

2025

Software Engineer — 2× Finalist

HNG Open Source Engineering Program (Cohort 11 & 13)

Contributed to Telex, a real-time communication platform. Built high-concurrency Rust microservices, RAG infrastructure, a cross-platform Tauri 2 desktop app, and AI agents with the Mastra framework.

2024 — 2025

Frontend Engineer

Jethro Ltd — Fintech Products

Led frontend development for PayCollect and DocStream, fintech products handling payment collection workflows and document processing pipelines with role-based views, JWT auth, and real-time analytics.

2024 — Present

Backend Engineer

Sparkly — Community Platform

Designed multi-platform community management with automated onboarding, banking-grade 2FA, and global payment processing with Stripe and Flutterwave. Optimized high-traffic endpoints with Redis caching.

2025

Fullstack Engineer (Contract)

PayRent — Real-Estate Platform

Designed and built a full-stack real-estate investment and rent management platform — cross-platform mobile app and backend API supporting tenants, landlords, and property managers with role-based access and real-time chat.

2023 — 2024

Backend Engineer / CTO

Fitzzy Systems Limited

Led backend architecture and engineering team delivery. Redesigned systems for 50% improved responsiveness. Introduced Docker and Kubernetes, standardizing deployment workflows across production infrastructure.

2023

Backend Engineer

Techivate Ltd — Secure E-Commerce

Built a secure e-commerce platform for military and security agencies, with session management, XSS mitigation, and integrated payment flows serving 10k+ daily users.

2023

Technical Writer

OpenReplay — Open-Source Developer Tool

Produced developer-focused technical content and implementation tutorials covering frontend architecture, APIs, and modern JavaScript ecosystems for an open-source session replay platform.

Raising the bar for the whole team.

Engineering Leadership

As CTO at Fitzzy Systems, led backend architecture and engineering team delivery. Introduced Docker and Kubernetes for container orchestration, improving release cycle velocity and standardizing deployment workflows across production.

Open Source & Community

Two-time HNG finalist (Cohort 11 & 13) — contributing to Telex, a real-time communication platform. ALX C8 Community Member and ALX Community Fellow, actively engaged in the NestJS Developer Community.

Technical Writing & Education

Published technical content with Mastra.ai, OpenReplay, Medium, and Dev.to — covering AI agents, ransomware defense, API design, and modern JavaScript ecosystems. Maintained documentation quality through thorough content reviews and interactive tutorials.

Mentoring & Standards

Conducted code reviews, mentored engineers, and facilitated knowledge-sharing sessions at Fitzzy Systems to grow team capability and delivery quality. Architected a modular NestJS boilerplate adopted by 50+ developers in the HNG program.

Sharing what I’ve learned the hard way.

Building an AI-Powered Domain Expiry Checker: A Mastra.ai Deep Dive

Technical deep dive into building autonomous AI agents for domain tracking and analysis — published on the official Mastra.ai blog.

How to Save Yourself from Ransomware: A Quick Tip

Practical security guidance on protecting yourself from ransomware attacks — covering prevention strategies and recovery tips.

Understanding API Like a Pro

A comprehensive guide to API design and consumption patterns, covering REST principles, authentication strategies, and best practices for building robust integrations.

Let’s build something meaningful.

idowuseyi22@gmail.com LinkedIn GitHub Download Resume

Open to full-time roles, contract engagements, and platform engineering opportunities.