[ { "basics": { "name": "Oluwaseyi Idowu", "label": "Senior Fullstack & Platform Engineer", "image": "", "email": "idowuseyi22@gmail.com", "phone": "(+234)8136899991", "url": "https://github.com/idowuseyi22", "summary": "Senior Fullstack & Platform Engineer with 5+ years of experience designing, building, and operating production-grade systems across health-tech, fintech, SaaS, and developer tooling. Specialized in backend architecture, distributed systems, and platform engineering with deep expertise in TypeScript/NestJS, Rust (Axum), Python/FastAPI, PostgreSQL, and Redis.\n\nLed end-to-end delivery of HIPAA-compliant health platforms, AI agent infrastructure, vector search pipelines, multi-environment CI/CD systems, and payment platforms — consistently improving reliability, reducing deployment cycles, and hardening production infrastructure.\n\nFocused on secure, scalable system design with strong operational discipline — from architecture decisions through deployment, monitoring, and incident prevention.", "location": { "address": "", "postalCode": "200132", "city": "Ibadan", "countryCode": "NG", "region": "Oyo State" }, "profiles": [ { "network": "LinkedIn", "username": "oluwaseyi-idowu", "url": "https://www.linkedin.com/in/oluwaseyi-idowu-sunday" }, { "network": "GitHub", "username": "idowuseyi22", "url": "https://github.com/idowuseyi22" } ] }, "work": [ { "name": "Theraptly", "position": "Lead Fullstack Engineer", "url": "", "startDate": "2025-08-12", "endDate": "", "summary": "Lead engineering for Theraptly, a HIPAA-compliant health-tech platform, and its secure document processing system — owning backend architecture, frontend delivery, and infrastructure automation from design through production.", "highlights": [ "Led architecture and delivery of a HIPAA-compliant health-tech platform, owning backend services, frontend applications, and infrastructure automation across production environments.", "Designed and built a secure document analysis service with custom middleware for PII detection, request threat analysis, and malicious payload filtering across processing workflows.", "Architected a headless CMS layer powering content pipelines with pre-signed URL media delivery, optimized document rendering, and structured content management.", "Built CI/CD pipelines across dev, staging, and production environments using GitHub Actions and SSH-based deployment automation, reducing release cycles by 50%.", "Hardened platform security posture with Redis-backed honeypot monitoring, non-root container execution, and strict filesystem permission policies — reducing unauthorized access attempts by 60%.", "Integrated resilient payment workflows with Stripe and Paystack using idempotency protections and cryptographic webhook validation, achieving 99.9% transaction reliability.", "Developed a compliance gap analysis dashboard with responsive data visualization for tracking regulatory requirements across health-tech operations." ] }, { "name": "Jethro Ltd", "position": "Frontend Engineer", "url": "", "startDate": "2024-08-01", "endDate": "2025-07-31", "summary": "Led frontend development for PayCollect and DocStream — fintech products handling payment collection workflows and document processing pipelines for business-critical operations.", "highlights": [ "Led frontend development for fintech platforms handling payment collection and document processing, delivering production-grade interfaces supporting multi-stakeholder financial workflows.", "Built the PayCollect dashboard with role-based views for payment tracking, merchant onboarding, and transaction analytics with real-time data visualization.", "Engineered secure authentication flows with JWT token management, auto-logout, and permission-based component rendering for sensitive financial applications.", "Developed multi-channel document processing interfaces with rich editing capabilities and gateway management for HTTP, SMPP, and email delivery pipelines.", "Implemented server-side pagination, schema-validated forms, and location-based merchant services with Google Maps integration." ] }, { "name": "HNG Open Source Engineering Program", "position": "Software Engineer", "url": "telex.im", "startDate": "2025-09", "endDate": "2025-12", "summary": "Selected as a two-time HNG finalist, contributing to Telex — a real-time communication platform — building high-concurrency microservices, RAG infrastructure, and cross-platform systems.", "highlights": [ "Developed high-concurrency microservices in Rust (Axum, Tokio) handling authentication and payment workflows with async PostgreSQL connection pooling for production-grade throughput.", "Built a RAG and semantic search service with vector database integration, enabling efficient document retrieval across thousands of documents with optimized text chunking for LLM context windows.", "Engineered a cross-platform desktop application using Tauri 2 with Rust IPC commands and native system integration, delivering a lightweight alternative to Electron-based solutions.", "Designed an N8N Node Executor service exposing a JSON-RPC 2.0 API for programmatic workflow execution via the Agent-to-Agent protocol.", "Built AI agents using the Mastra framework to automate domain analysis and expiry tracking with structured output validation." ] }, { "name": "PayRent Mobile App", "position": "Fullstack Engineer (Contract)", "url": "", "startDate": "2025", "endDate": "", "summary": "Designed and built both backend API and cross-platform mobile app for PayRent, a multi-role real-estate investment and rent management platform.", "highlights": [ "Designed and delivered a full-stack real-estate platform — cross-platform mobile app and backend API — supporting tenants, landlords, and property managers with role-based access control.", "Architected the mobile application with persistent state management, role-based navigation, and responsive UI supporting complex investment and rent payment workflows across iOS and Android.", "Built a multi-user marketplace API with real-time chat and notifications via WebSocket, role-based access control, and structured data isolation.", "Implemented CI/CD pipelines with GitHub Actions and Docker, reducing deployment time by 50% across environments." ] }, { "name": "Sparkly", "position": "Backend Engineer (Remote)", "url": "sparkly.so", "startDate": "2024-09-01", "endDate": "", "summary": "", "highlights": [ "Designed and built a multi-platform community management system with automated onboarding and moderation, increasing community engagement by 50%.", "Implemented secure 2FA authentication with TOTP and JWT strategies for banking-grade account security.", "Engineered global payment processing with Stripe and Flutterwave, implementing cryptographic webhook signature verification to prevent replay attacks and ensure transaction integrity.", "Optimized high-traffic API endpoints with Redis caching, reducing database load by 40% under sustained concurrent workloads." ] }, { "name": "HNG Open Source Engineering Program", "position": "Backend Engineer", "url": "", "startDate": "2024-07-01", "endDate": "2024-10-31", "summary": "", "highlights": [ "Architected a modular NestJS boilerplate adopted by 50+ developers, implementing standardized API response handling and granular role-based authorization guards.", "Built high-performance Rust microservices (Axum, Tokio) with async database pooling for high-concurrency authentication workloads.", "Developed real-time game backend with WebSocket-based state synchronization for multi-player interaction.", "Standardized error handling and validation pipelines with custom decorators and DTOs, reducing runtime exceptions by 30%." ] }, { "name": "Fitzzy Systems Limited", "position": "Backend Engineer / Chief Technology Officer", "url": "", "startDate": "2023-03-01", "endDate": "2024-03-01", "summary": "Akure, Nigeria", "highlights": [ "Led backend architecture and engineering team delivery, improving application responsiveness by 50% through system redesign and performance optimization.", "Designed RESTful APIs serving millions of daily requests with Node.js, Express, and MongoDB across production infrastructure.", "Introduced Docker and Kubernetes for container orchestration, improving release cycle velocity by 10% and standardizing deployment workflows.", "Implemented authentication and authorization systems protecting user data across a multi-service architecture.", "Conducted code reviews, mentored engineers, and facilitated knowledge-sharing sessions to grow team capability and delivery quality." ] }, { "name": "Techivate Ltd", "position": "Backend Engineer", "url": "", "startDate": "2023", "endDate": "2023", "summary": "Built the Techivate e-commerce platform for military and security agencies.", "highlights": [ "Built a secure e-commerce platform serving military and security agencies, with session management and XSS mitigation for 10k+ daily users.", "Integrated Stripe and Paystack payment flows, improving checkout completion rate by 30% with secure httpOnly cookie strategies.", "Optimized server performance with AWS EC2 deployment and Redis session caching, reducing API latency by 50%.", "Designed RESTful APIs with clear service boundaries and error handling protocols for reliable platform operations." ] }, { "name": "OpenReplay", "position": "Technical Writer (Remote)", "url": "", "startDate": "2023-01-01", "endDate": "2023-12-31", "summary": "Produced developer-focused technical content for an open-source session replay platform.", "highlights": [ "Produced developer-focused technical content and implementation tutorials covering frontend architecture, APIs, and modern JavaScript ecosystems for an open-source developer tool.", "Maintained documentation quality standards through thorough content reviews, interactive tutorials, and visual aids that improved developer onboarding experience." ] } ], "education": [ { "institution": "ALX – Holberton School", "url": "", "area": "Software Engineering", "studyType": "Certificate", "startDate": "2022-01-01", "endDate": "2023-12-31", "score": "", "courses": [] }, { "institution": "Federal University of Technology Akure", "url": "", "area": "Meteorology", "studyType": "B. Tech", "startDate": "2013-01-01", "endDate": "2018-12-31", "score": "", "courses": [] } ], "skills": [ { "name": "Languages", "level": "Expert", "keywords": ["TypeScript", "JavaScript", "Rust", "Python", "Go"] }, { "name": "Backend & APIs", "level": "Expert", "keywords": ["NestJS", "FastAPI", "Express", "Django", "Axum (Rust)", "GraphQL", "REST APIs", "WebSockets", "Socket.io", "Microservices"] }, { "name": "Frontend", "level": "Expert", "keywords": ["React", "Next.js", "Vite", "Redux Toolkit", "TanStack Query", "Tailwind CSS"] }, { "name": "Mobile & Desktop", "level": "Expert", "keywords": ["React Native (Expo)", "Tauri 2 (Rust)"] }, { "name": "Infrastructure & DevOps", "level": "Expert", "keywords": ["Docker", "Kubernetes", "GitHub Actions", "AWS (EC2, S3)", "Nginx", "Linux", "CI/CD"] }, { "name": "Databases & Messaging", "level": "Expert", "keywords": ["PostgreSQL", "Redis", "MongoDB", "ChromaDB", "BullMQ", "Prisma", "SQLx"] }, { "name": "Architecture & Engineering", "level": "Expert", "keywords": ["Distributed Systems", "AI Agents", "RAG Pipelines", "System Design", "Authentication & Security", "Performance Optimization", "Observability"] } ], "languages": [ { "language": "English", "fluency": "Native or Bilingual" }, { "language": "Spanish", "fluency": "Professional Working Proficiency" } ], "certificates": [ { "name": "2 Times HNG Finalist (Cohort 11 & 13)", "date": "2024, 2025", "issuer": "HNG" }, { "name": "ALX AI Career Essentials", "date": "2023", "issuer": "ALX" }, { "name": "ALX Certified Backend Engineer", "date": "2023", "issuer": "ALX" } ], "publications": [ { "name": "Building an AI-Powered Domain Expiry Checker: A Mastra.ai Deep Dive", "publisher": "Mastra.ai (Official Blog)", "releaseDate": "2025", "url": "", "summary": "Technical deep dive into building autonomous AI agents for domain tracking and analysis." }, { "name": "How to Save Yourself from Ransomware: A Quick Tip", "publisher": "Medium", "releaseDate": "2024", "url": "https://medium.com/@idowuseyi22/how-to-save-yourself-from-ransomware-ransomware-shield-a-quick-tip-8fa0d2eb1005", "summary": "" }, { "name": "Understanding API Like a Pro", "publisher": "Dev.to", "releaseDate": "2024", "url": "https://dev.to/idowuseyi/understanding-api-like-a-pro-5cfo", "summary": "" } ], "projects": [ { "name": "Vestly API", "description": "Production-ready multi-tenant property management API with ownership credit tracking.", "highlights": [ "Designed an immutable, append-only ownership credit ledger with strict organization-level data isolation and comprehensive input validation.", "Implemented async job processing for property valuation snapshots, role-based access control across tenant/landlord/admin roles, and containerized deployment with full test coverage." ], "keywords": ["Express.js", "MongoDB", "BullMQ", "Redis", "TypeScript", "Zod", "Docker"], "url": "" }, { "name": "FileNest", "description": "Production-ready GraphQL API for file upload and management with real-time updates.", "highlights": [ "Built a GraphQL API with JWT authentication, S3-compatible object storage, and real-time upload notifications via subscriptions.", "Implemented metrics dashboard tracking upload statistics per user, file size validation, and containerized deployment." ], "keywords": ["NestJS", "GraphQL", "TypeORM", "PostgreSQL", "MinIO", "Apollo Server", "Docker"], "url": "" }, { "name": "Domain-Master", "description": "Autonomous AI agent for domain name analysis and expiration tracking.", "highlights": [ "Engineered an autonomous AI agent with structured output validation and LLM-driven domain analysis.", "Implemented intelligent fallback strategies for Whois data retrieval, ensuring 99% availability for domain metrics." ], "keywords": ["TypeScript", "AI Agents", "Mastra", "LLM", "Zod"], "url": "" }, { "name": "HNG13 — RAG & Search Service", "description": "High-performance Retrieval Augmented Generation service for document indexing and semantic search.", "highlights": [ "Built a vector search pipeline enabling semantic retrieval over thousands of PDF documents with optimized embedding strategies.", "Designed modular document processing with asynchronous embedding updates, ensuring zero-downtime search availability." ], "keywords": ["NestJS", "ChromaDB", "RAG", "Vector Database", "Microservices"], "url": "" }, { "name": "NestJS-GraphQL Auth", "description": "Secure authentication microservice built with GraphQL and Apollo Federation.", "highlights": [ "Implemented a schema-first GraphQL API providing strongly-typed authentication mutations with custom authorization guards and JWT strategies." ], "keywords": ["GraphQL", "NestJS", "Apollo Server", "Passport-JWT"], "url": "" }, { "name": "Lumestay", "description": "Accommodation booking platform built with NestJS microservices architecture.", "highlights": [ "Implemented authentication, booking, and payment services with inter-service communication and Stripe payment integration with webhook handling." ], "keywords": ["NestJS", "Microservices", "Stripe", "Redis", "TypeORM"], "url": "" }, { "name": "Google Auth + Paystack (Rust)", "description": "High-concurrency authentication and payment microservice built in Rust.", "highlights": [ "Built Google OAuth and Paystack payment integration with async connection pooling and tracing/observability middleware for production monitoring." ], "keywords": ["Rust", "Axum", "Tokio", "SQLx", "PostgreSQL", "Paystack"], "url": "" } ], "interests": [ { "name": "Open Source", "keywords": ["HNG Internship Finalist – Team Starlight and Telex", "ALX C8 Community", "ALX Community Fellow", "NestJS Developer Community"] } ] } ]