Tamziycode

`whoAmI`

{
  "name": "Tamilore Afolabi",
  "alias": "Tamziy",
  "role": "Full-Stack Software Engineer",
  "location": "Ibadan, Nigeria",
  "focus": [
    "Backend systems that scale",
    "Auth flows that can't be bypassed",
    "Transactions that stay consistent under concurrency",
    "APIs built for the long run"
  ],
  "stack": {
    "backend": ["Java", "Spring Boot", "Node.js", "Express"],
    "frontend": ["React", "Vite", "HTML", "CSS"],
    "databases": ["MySQL", "PostgreSQL", "MongoDB"],
    "security": ["JWT", "bcrypt", "RBAC", "Spring Security"]
  },
  "currently": "Mastering Spring Boot — layered architecture, JPA/Hibernate, Spring Security",
  "philosophy": "I don't just ship features. I engineer the layer underneath them."
}

`[ TECH_STACK ]`

Languages & Core

Frameworks & Runtimes

Databases

Security & Auth

Tools

In Progress

`[ ACTIVE_PROCESSES ]`

Spring Boot: Mastering layered architecture — service/repository separation, JPA entity relationships, Spring Security. Migrating from Node.js-first thinking to proper enterprise patterns
DSA: Daily problem-solving focused on pattern recognition, time complexity, and solutions that hold up under scale — arrays, linked lists, recursion, DP
Systems thinking: Concurrency control, data integrity under load, and access control architecture

`[ FLAGSHIP_SYSTEM ]` — Learnova

Production-grade e-learning platform with dual user roles, end-to-end JWT auth, email verification, and a custom dark-mode design system. Built across four deliberate phases.

System Architecture

graph TD
    Client["React 19 Frontend"] -->|HTTPS| API["Express 5 REST API"]
    API --> AuthMW["JWT Auth Middleware"]
    AuthMW -->|Valid token| RoleMW["Role Guard Middleware"]
    RoleMW -->|Student| SC["Student Controllers"]
    RoleMW -->|Instructor| IC["Instructor Controllers"]
    SC --> DB[("MySQL Database")]
    IC --> DB
    DB -->|WHERE instructor_id = ?| IC
    API -->|Signup trigger| Email["Resend API"]
    Email -->|32-byte token| Inbox["User Inbox"]
    Inbox -->|/verify| API

    style Client fill:#0c1018,color:#61DAFB,stroke:#61DAFB
    style API fill:#0c1018,color:#339933,stroke:#339933
    style AuthMW fill:#0c1018,color:#ff2d1f,stroke:#ff2d1f
    style RoleMW fill:#0c1018,color:#ff2d1f,stroke:#ff2d1f
    style SC fill:#0c1018,color:#e8edf5,stroke:#263044
    style IC fill:#0c1018,color:#e8edf5,stroke:#263044
    style DB fill:#0c1018,color:#4479A1,stroke:#4479A1
    style Email fill:#0c1018,color:#EA4335,stroke:#EA4335
    style Inbox fill:#0c1018,color:#8a95a8,stroke:#263044

Engineering Breakdown

Layer	What was built	Why it matters
Auth	JWT stateless sessions + bcrypt (cost 10). Signup triggers branded email with 32-byte cryptographic token	Accounts locked at API level until confirmed — not just a UI gate
RBAC	Three independent layers: React route guard → Express middleware → SQL ownership check	No client-side bypass can reach data — unauthorised access is structurally impossible
Session	AuthContext handles token expiry and invalid tokens as separate cases	No broken states served — redirect fires before stale data renders
Content	YouTube URL parser handles watch / youtu.be / embed / Shorts	Search + filter state in URL params — every filtered view is directly linkable
Prod	Error boundaries, skeletons, typed token error responses, CORS locked to origin	~30 files, 1,200+ line CSS design system, responsive to 320px

`>> Exception Handling & Edge Cases`

Stale State Rejection: If a user’s JWT expires while they are filling out a form, the API rejects the submission and the React AuthContext catches the 401, clears local storage, and preserves the user's input state while forcing a re-auth.
Concurrent Video Tracking: Handles edge cases where a user opens the same course in two tabs; progress tracking enforces a "latest timestamp wins" rule to prevent database deadlocks.

`>> Performance Benchmarks (Local)`

Auth Overhead: Custom JWT middleware adds <15ms latency to protected routes.
Query Optimization: Indexed instructor_id foreign keys dropped course-fetching queries from O(n) table scans to O(log n), averaging 120ms response times in local testing.

[Insert screenshot of Postman test suite passing or API logs blocking an unauthorized request here]

`[ ANCILLARY_SYSTEMS ]`

// GigConnect

Escrow-Backed Service Marketplace · Hackathon

Financial trust engineered into the architecture — not bolted on.

Interswitch API escrow — funds held until both parties confirm completion, no mediator needed
Webhook handler + idempotency key validation — prevents double-charging on retries
Community price index aggregates rates platform-wide — anti-exploitation against gouging
Geolocation routing to nearest available professional
Strict MVC — auth, job lifecycle, chat in independent testable modules

// Library Management API

Enterprise REST API · Concurrency Focus

Built for correctness under pressure. Architecture prioritises data integrity over convenience.

Pessimistic locking on borrow transactions — concurrent requests for the last copy cannot both succeed
Transactional Rollback: If an inventory decrement succeeds but the borrow record insert fails, the entire SQL transaction rolls back to prevent phantom missing books
JWT RBAC — admin (inventory write) vs patron (borrow/view), enforced at middleware layer
Performance: Paginated and indexed search endpoints maintain <80ms response times even when simulating 10,000+ mock book records

// Computerized Exam System

Browser-Level Security

Anti-cheat logic in a middleware layer — no UI action trusted at face value.

Visibility API + fullscreen lock + input interception — tab switches caught before reaching the DOM
Session state serialised on each answer — recovers in under 1s after interruption, no answer loss
Violations logged with timestamp and event type — tamper evidence, not just prevention
MongoDB for flexible session document storage — exam snapshots without rigid schema constraints

// DSA & Algorithms

Daily Practice

Solving problems that hold up under scale — not just ones that pass test cases.

Arrays, linked lists, stacks, queues — core patterns and implementation
Recursion and DP — memoisation, tabulation, state transitions
Binary search, two pointers, sliding window as standard toolkit
Time and space complexity analysis on every solution

`[ TELEMETRY ]`

`[ EDUCATION ]`

	Institution	Degree	Status
`*`	University of Ibadan	B.Sc. Computer Science	Penultimate Year

`[ INITIATE_HANDSHAKE ]`

Open to backend and full-stack roles where real engineering problems exist.

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