Tijani O. Sheu (Ahmad)

         

I am a Senior Full-Stack & Distributed Systems Engineer, tech community executive, and the architect behind GetCracked and Tutelee. Recognized as one of Nigeria's Top 20 Student Tech Leaders, I serve as President of the LASU Tech Society (coordinating all faculty tech ecosystems) and Coordinator of the AI, Robotics and Automation Lab at LASU Unipod (Innovation Hub).

My engineering focuses on solving complex distributed and client-side systems challenges:

• Client-Side Runtimes & Spatial Physics: At GetCracked, I engineered an in-browser platform that compiles 5 language runtimes to WebAssembly inside Web Workers for zero-latency execution, coupled with a physical spatial motion visualizer and an interactive distributed topology whiteboard simulating live microservices traffic.
• Real-Time Edge Infrastructure & Escrow State Machines: At Tutelee, I architected a global educational marketplace connecting families across 15+ countries in 50+ languages, embedding native Daily.co WebRTC video suites and an automated escrow payment pipeline to eliminate fragmented third-party tools and cross-border billing friction.
• Enterprise Scale & Open Source: Beyond my ventures, I've engineered fintech payment architectures processing transactions for 10,000+ monthly active users on Stripe, sub-200ms financial telemetry pipelines, and contributed upstream to global infrastructure like TanStack Query (2M+ weekly developers) and Chakra UI.

Apr 2025 – Feb 2026

• Next.js & Express.js Inventory Engine: Engineered frontend and backend architectures for inventory management, optimizing database queries and API response times by 45%.
• Stripe Global Checkout: Integrated Stripe payment APIs into a high-traffic event ticketing platform, processing payments for 10,000+ monthly active users and elevating checkout conversion by 25%.
• Recommender Model Integration: Collaborated with ML engineers to deploy inference endpoints that decreased trading decision latency by 35%.

Jun 2024 – Feb 2025

• High-Performance Financial Pipelines: Built real-time financial data ingestion and analytics pipelines with memoization and query indexing, maintaining strict sub-200ms response times.
• Enterprise Analytics Dashboards: Engineered real-time B2B analytics dashboards, slashing manual reporting by 45%.
• Security & Compliance: Implemented RBAC, JWT, and OAuth 2.0 security frameworks meeting rigorous financial audit requirements.
• Cross-Platform SaaS: Shipped mobile-first SaaS platform serving 2,500+ MAU across the US and Canada (+30% session retention).

Feb 2023 – Jul 2024

• Distributed Booking Architecture: Designed and deployed a full-stack booking system supporting 5,000 concurrent demo users with live search filters and auth workflows.
• Containerization & CI/CD: Containerized microservices using Docker with automated testing suites, lowering deployment failures by 13% and enabling zero-downtime rollbacks.

"Build real systems. Step by step. In your browser." — An interactive engineering platform bridging the gap between algorithmic theory and production systems design without slides or pre-recorded videos.

• Zero-Latency Client-Side WASM Execution:
  • Embedded real language interpreters compiled to WebAssembly (WASM) executing entirely within dedicated browser Web Workers.
  • Multi-language sandbox supporting 5 programming languages (TypeScript, JavaScript, Python, Java, C++, and Go) with zero server execution latency, zero container startup queues, and zero compute infrastructure costs.
• Physics-Based Spatial Motion Visualizer:
  • Engineered a coordinate-explicit spatial rendering engine where elements physically lift, follow geometric Bezier translation arcs, and land into memory slots—replacing static pre-rendered animations.
  • Line-by-line synchronized execution stepping with live code pointers across 8 core data structures: Arrays, Linked Lists, Stacks, Queues, Binary Trees, BSTs, Heaps, and Hash Maps.
• Interactive Distributed System Design Canvas & Scored Labs:
  • Real-time distributed architecture whiteboard simulating live packet traffic flows: Cloudflare Edge CDN (85k req/s, 8ms) ➔ Envoy API Gateway (48k req/s, 14ms) ➔ Go Core Microservices across 3 AZs (P99 32ms) ➔ Redis Primary Cluster (1.2ms) & Distributed PostgreSQL.
  • Built-in capacity estimation calculators for storage footprint, QPS, P99 latency, and network bandwidth.
  • 6 Scored Design Labs evaluating interview reasoning (requirements, capacity math, API design, schema modeling, horizontal scaling, and bottleneck mitigation) across a 10-dimensional architectural matrix.
• Comprehensive Curriculum & AI Mock Interviews:
  • 31 lessons (20 DSA + 11 System Design), 42 practice problems with progressive hints and hidden test suites, and 8 multi-step production builds (32 build steps: LRU cache, distributed token-bucket rate limiter, undo/redo state tree).
  • 8 verified first-party FAANG interview guides (Amazon, Google, Meta, Microsoft, Apple, Netflix, Uber) and timed 45-minute mock interview rounds with a Socratic AI interviewer that listens, challenges assumptions, and scores architectural trade-offs.
• Tech Stack: Next.js 15 TypeScript WebAssembly (WASM) Web Workers HTML5 Canvas / SVG Vector Engine TailwindCSS Vercel

"Where culture meets world-class learning." — An international educational marketplace built to solve cultural disconnect in global education, connecting diaspora families across 15+ countries with certified cultural mentors.

• Native Daily.co WebRTC Video Suite:
  • Fully integrated in-browser video classrooms eliminating fragmented third-party meeting links (Zoom/Google Meet).
  • Delivers sub-second latency 1-on-1 and group classrooms with interactive whiteboards, screen sharing, host session controls, and automated session recording.
• The Safeguard Stack & Automated Escrow Rails:
  • Tutor Identity & Background Screening: Enforces mandatory multi-layer identity verification and background screening for every educator prior to their first session.
  • Credential-Backed Qualifications: Independently verifies academic degrees, certifications, and teaching track records.
  • Automated Escrow State Machine: Funds are locked in an escrow state machine upon booking and released only upon verified session delivery—powering automated weekly tutor disbursements and completely eliminating unpaid invoice chasing.
• Global Cross-Timezone Scheduling Matrix:
  • Proprietary timezone negotiation matrix resolving scheduling conflicts across 15+ countries (UK, US, Canada, Australia, Nigeria, Ghana, Kenya, South Africa, Germany, France, UAE, Saudi Arabia, etc.) supporting 50+ languages.
• Distributed Edge & Search Infrastructure:
  • Session recordings, lecture notes, and classroom assets streamed to Cloudflare R2 object storage.
  • Fastify microservices hosted on Railway with PostgreSQL persistence and Meilisearch delivering sub-millisecond query results across tutor subjects, language dialects, and availability.
• Tech Stack: Next.js 14 Fastify / Node.js Daily.co WebRTC PostgreSQL Cloudflare R2 Meilisearch Railway Docker