Batimehin Emmanuel - Full Stack Developer

Overview

A backend API engineer (senior-level, ~4.0) focused on Node.js and MongoDB-driven SaaS backends with solid domain features for CRM/inventory and subscription-based trading products. The strongest proven skill is building REST APIs and domain workflows with concrete artifacts like the LPO/invoice and FIFO stock deduction logic in TISWHORDweb/Sartor-server-beta/controller/controller.customer.js. The public code lacks visible cross-service orchestration, formal observability/metrics, and explicit migration/versioning histories for schema evolution.

Phone

Timeline

Full Stack Developer · Middle

RYD Learning · Full-Time

Aug 2023 to Present 3 Years 3 Months In office

Built scalable REST and GraphQL APIs with Node.js and Express to support web and mobile applications. Improved API response times using database query optimization, indexing, and Redis-based caching. Developed reusable React and Vue.js components and implemented JWT authentication with role-based access control. Created Go microservices for background processing and external API integrations, improving backend performance and scalability.

Rest API

GraphQL

Node JS

React.js

Vue.js

Go

Redis

Backend Developer · Middle

Reef Financial Limited · Full-Time

Jan 2020 to Mar 2024 4 Years 2 Months In office

Delivered backend functionality for financial products with focus on reliability, security, data integrity, and auditability. Reduced critical bugs and improved production reliability by strengthening debugging workflows, logging, and validation. Implemented audit logging and monitoring to increase operational transparency and optimized database queries and API endpoints for higher transaction volumes. Added transaction status monitoring and error-handling workflows to improve operational reliability.

Frontend Developer · Middle

Cloud Equipment · Full-Time

Apr 2021 to Jul 2023 2 Years 3 Months In office

Built modular, reusable React components to improve development speed. Optimized frontend performance to reduce page load times and improve user-facing responsiveness. Integrated backend APIs with collaboration from backend engineers to maintain consistent data flows across applications. Improved UI consistency, accessibility, and maintainability across customer-facing pages.

React.js

National Open University of Nigeria

Bachelor's Degree · Computer Science

Lagos, Nigeria

Projects

Mongoro

Implemented MERN-based digital wallet features for payments, transfers, QR transactions, and bill payments. Built secure Node.js APIs and enhanced React-based transaction workflows for reliable user operations. Added Redis caching and multicurrency transaction processing with currency conversion logic to support transactions across supported currencies.

Visa Companion AI

Developed Next.js and Vue.js frontends along with Node.js and Go backend services for AI-driven visa eligibility checks. Integrated OpenAI API calls and prompt workflows to generate personalized user experiences. Implemented the end-to-end flow from UI interaction to backend processing and results delivery.

Xolani Bridge

Created MERN-based workflows for secure medical imaging uploads, sharing, and reporting. Built APIs and frontend modules supporting collaboration between hospitals and radiologists. Focused on enabling structured data exchange for medical imaging use cases.

Davenport Microfinance Bank

Developed a full-stack digital banking web platform for a CBN-licensed microfinance bank. Delivered marketing pages and product interfaces, including account onboarding workflows. Built user-facing features for banking services such as loans, transfers, and mobile banking entry points.

Technical skills

Languages

5

Node JS

TypeScript

Go

JavaScript

PHP

Node JS

9

Express

Axios

Bcrypt

Mongoose

Multer

Got

Helmet

Joi

Nodemailer

Frontend

7

React.js

Vue.js

GraphQL

Next.js

Sass

Tailwind CSS

React Query

Other

21

Redis

Rest API

Zustand

AWS

PostgreSQL

Laravel

Dotenv

Framer Motion

MySQL

WordPress

Ant Design

Bootstrap

Vite

DigitalOcean

GitHub

OpenAI

Docker

Git

Postman

PostCSS

CI/CD

Senior Backend Developer Confidence: High API Engineer

A backend API engineer (senior-level, ~4.0) focused on Node.js and MongoDB-driven SaaS backends with solid domain features for CRM/inventory and subscription-based trading products. The strongest proven skill is building REST APIs and domain workflows with concrete artifacts like the LPO/invoice and FIFO stock deduction logic in TISWHORDweb/Sartor-server-beta/controller/controller.customer.js. The public code lacks visible cross-service orchestration, formal observability/metrics, and explicit migration/versioning histories for schema evolution.

API Design

6/10

How well APIs are designed

Consistent REST API patterns with input validation, pagination and search, a shared response wrapper and explicit session/token endpoints; missing explicit API versioning and idempotency patterns.

Evidence

TISWHORDweb/Sartor-server-beta/controller/controller.customer.js: GetAllLpos implements pagination, search and response.pagination TISWHORDweb/Sartor-server-beta/controller/controller.user.js: PasswordUpdate, GetDashboardSummary and GetAllUsers show consistent Joi validation and utils.JParser response wrapper TISWHORDweb/sigmora/server/controllers/auth.controller.js: login / refresh / logout / logoutAll implement session token lifecycle and session invalidation

Data Layer & Database

5/10

Working with databases

Solid use of Mongoose with lean(), populate patterns and aggregation pipelines to avoid N+1 queries; no migration history or multi-statement transactions visible.

Evidence

TISWHORDweb/Sartor-server-beta/controller/controller.product.js: GetAllProducts fetches batches, suppliers and restocks in bulk, builds maps to avoid N+1 fetches TISWHORDweb/Sartor-server-beta/controller/controller.user.js: topProducts uses an aggregation pipeline ($lookup, $group) for hand-tuned aggregation TISWHORDweb/sigmora/server/lib/mongodb.js: connectDB shows central DB connection setup and usage of mongoose

Scalability & Performance

4/10

Handling load and speed

Performance-conscious patterns (lean(), Promise.all, aggregate) are used, but there is little evidence of caching, queuing, rate-limit enforcement per-endpoint, or load-testing artifacts.

Evidence

TISWHORDweb/Sartor-server-beta/controller/controller.customer.js: uses .lean(), bulk ModelLpoProduct queries and in-memory reduces to compute totals TISWHORDweb/Sartor-server-beta/controller/controller.product.js: batches and restock joins use bulk queries and mapping to reduce DB round-trips sartor-company/dora-admin/src/utils/export.ts: client-side PDF/CSV generation (shows attention to payload shaping and size)

System Architecture

5/10

Overall system structure

Clear module separation (controllers, services, utils, models, routes) and a monolith API design with deliberate folder structure; not a distributed microservices architecture.

Evidence

TISWHORDweb/Sartor-server-beta/services/index.js: centralized service layer for emails and notifications TISWHORDweb/sigmora/server/app.js: imports and mounts route modules showing explicit routing separation TISWHORDweb/Sartor-server-beta/controller/controller.auth.js: middleware usage (multer, verifyToken) and modular auth endpoints

Security & Auth

5/10

Protecting data and access

Concrete auth/session handling, password hashing, reset-token hashing and session revocation are implemented; some security choices (sha1 for token strings in places, console logging) and lack of documented rate-limiting/csrf/cookie flags temper the score.

Evidence

TISWHORDweb/sigmora/server/controllers/auth.controller.js: forgotPassword/resetPassword uses hashed reset tokens and Session invalidation TISWHORDweb/Sartor-server-beta/controller/controller.auth.js: UserLogin and partnerPasswordReset show bcrypt-based checks and token assignment TISWHORDweb/Sartor-server-beta/controller/controller.user.js: createUser uses bcrypt.hash and hides passwords in responses

Reliability & Observability

3/10

Stability and monitoring

Basic reliability patterns present (error wrappers, session expiry, try/catch); limited observability, structured logging, retries/backoff, graceful shutdown or metrics/alerts instrumentation are visible.

Evidence

TISWHORDweb/Sartor-server-beta/core/core.error.js: centralized error type used across controllers (error handling pattern) TISWHORDweb/Sartor-server-beta/controller/controller.auth.js: session creation with expiry and Session.update for logout/refresh TISWHORDweb/Sartor-server-beta/services/index.js: LOG_DEBUG paths and console logging used for operational feedback

Verified artifacts

bennybat50/credit· contrib lala-seo/Seo-landing-page· contrib slantapp/ryd-cbt-frontend· contrib slantapp/ryd-ai-frontend· contrib

Expertise

Node.js· Middle

Databases & Vector Storage· Middle

Industries

Commerce· Middle

Financial Services· Middle

Technologies

Go· since 2023 · Middle

PHP

Rest API· since 2023

GraphQL· since 2023

Laravel

WordPress

Bcrypt

Joi

Multer

Mongoose

Helmet

Dotenv

Nodemailer

Got

Recommendations

Build RESTful SaaS backends that need solid domain logic for commerce: inventory, LPOs, invoices and supplier workflows (implement feature work, business rules and integrations).
Own auth and session systems for subscription products (token lifecycle, session revocation, password reset and email flows) and payment/webhook integrations.
Implement data-layer improvements and operational tooling: add DB migration histories, schema evolution scripts, and stronger observability (structured logging, metrics, traces).
Refactor monolith endpoints that touch heavy work into background jobs or queue consumers (e.g., bulk label creation, email send, and batch stock reconciliation) to reduce request latency.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

Sartor-server-beta dora-admin sigmora

Middle Frontend Developer Confidence: Medium App Engineer

Frontend app engineer (middle level) specializing in building complex admin dashboards and SPA data flows. Strongest proven skill is API and auth plumbing illustrated by the centralized axios client with robust request/response interceptors and the zustand auth store at slantapp/ryd-cbt-frontend/src/services/api.ts and src/store/authStore.ts. Public code lacks automated tests and CI, and there is limited evidence of measured performance work or advanced async-state machinery like cancellations or state machines.

UI Component Architecture

4/10

How interface parts are built

Clear service/component separation and a centralized auth store show deliberate component boundaries, but there is no evidence of a bespoke component library, design-system tokens beyond CSS variables, or advanced composition patterns in React components.

Evidence

slantapp/ryd-cbt-frontend/src/services/api.ts slantapp/ryd-cbt-frontend/src/store/authStore.ts sartor-company/dora-admin/Client_Admin_Console_DORASCAN_Sartor_Chain_v4-5.html

Responsive & Cross-browser

5/10

Works on all screens and browsers

Responsive CSS and many media queries are implemented and there are responsive table patterns and utility classes, but there is no evidence of advanced layout techniques like container queries or explicit RTL/i18n plumbing.

Evidence

slantapp/ryd-cbt-frontend/src/index.css sartor-company/dora-admin/Client_Admin_Console_DORASCAN_Sartor_Chain_v4-5.html

Performance Optimization

2/10

Speed of the interface

Basic performance considerations exist (API timeout, lightweight utilities), but no measured perf artifacts, bundle analysis, or virtualization for long lists are present.

Evidence

slantapp/ryd-cbt-frontend/src/services/api.ts

Accessibility & Semantics

4/10

Usable for everyone

Practical accessibility decisions are visible - labelled inputs, aria-label on modals, and responsive table data-labels - but no evidence of systematic a11y testing, CI checks, or comprehensive focus management for custom widgets.

Evidence

sartor-company/dora-admin/Client_Admin_Console_DORASCAN_Sartor_Chain_v4-5.html slantapp/ryd-cbt-frontend/src/index.css

State Management & Data Flow

4/10

Managing data in the app

Server-state patterns are reasonably disciplined with a centralized axios client and interceptors plus a zustand auth store that validates tokens and decodes impersonation chains; however there is limited evidence of advanced async-state handling like cancellation, optimistic updates with rollback, or state machines.

Evidence

slantapp/ryd-cbt-frontend/src/services/api.ts slantapp/ryd-cbt-frontend/src/store/authStore.ts

UX & Visual Polish

6/10

Look and feel quality

Strong UX focus and visual polish for admin flows, export/download UX, masking and audit-notes for PII, and many edge-state UIs and modals indicate solid product-minded frontend work.

Evidence

sartor-company/dora-admin/Client_Admin_Console_DORASCAN_Sartor_Chain_v4-5.html slantapp/ryd-cbt-frontend/src/utils/themeUtils.ts

Expertise

React· Middle

HTML & CSS· Middle

Modern Web Frameworks· Middle

Frontend Architecture & Build Tools· Middle

Industries

Commerce· Middle

Financial Services· Middle

Education· Middle

Technologies

JavaScript

TypeScript· since 2024 · Middle

Node JS· since 2023 · Senior

Vue.js· since 2023

Zustand

DigitalOcean

Tailwind CSS

Next.js

Express

CI/CD

Bootstrap

Git

AWS

Docker

React.js· since 2021

Vite

React Query

Axios

Ant Design

Sass

PostCSS

Framer Motion

GitHub

Recommendations

Develop admin dashboards and data-heavy SPA features with complex forms, file exports, and role-based UX.
Implement and extend consumer-facing loyalty and fraud-ops interfaces - onboarding, PII-safe exports and audit trails.
Build education platforms and assessment frontends that integrate with REST APIs and centralized auth flows.
Improve codebase quality by adding automated tests (unit and integration) and CI lint/a11y checks.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

ryd-cbt-frontend dora-admin sigmora

Middle Game Developer Confidence: High Generalist

Frontend TypeScript engineer (Middle level) specializing in building typed React admin consoles and reliable API layers. Strongest proven skill is designing typed API clients with shared caching and inflight dedupe, demonstrated by src/hooks/useLiveOptions.ts and the api modules such as src/api/ops.ts and src/api/catalog.ts. There is little or no public evidence of game development, rendering or physics work, deterministic simulation, netcode, low-level graphics shaders, profiler-driven frame-budget optimizations or formal test suites.

Gameplay Systems & Mechanics

How game logic works

Not evidenced in public code

Graphics & Rendering

Drawing game visuals

Not evidenced in public code

Physics & Math

Game physics and math

Not evidenced in public code

Engine Proficiency

Skill with the game engine

Not evidenced in public code

Performance & Frame Budget

3/10

Keeping the game smooth

Evidence of practical request-level performance patterns - shared caches, inflight dedupe and TTL-based caching to avoid duplicate network work. No frame-budget profiling or low-level allocation tuning present.

Evidence

sartor-company/Sartor-CRM/src/hooks/useLiveOptions.ts: global cache + inflight Promise dedupe and listeners to avoid redundant fetches sartor-company/Sartor-CRM/src/api/ops.ts: listWarehouses uses cachedGet with TTL and invalidateRequestCache calls sartor-company/Sartor-CRM/src/api/catalog.ts: repeated use of cachedGet/listParams pattern for efficient listing endpoints

Content Pipeline & Tooling

3/10

Tools for game content

Utility tooling for exports and invoices including CSV and PDF generation and blob downloads, plus build scripts and Vite config for packaging. Basic client-side packaging and zip generation patterns exist but no CI automation or import pipelines shown.

Evidence

sartor-company/dora-admin/src/utils/export.ts: CSV and multi-page PDF report generation using jsPDF and autoTable sartor-company/dora-admin/src/utils/export.ts: downloadInvoicePdf implementation with bank account selection and PDF layout sartor-company/Sartor-CRM/src/utils/invoice.ts: invoice helper functions for amounts, status and date handling used by export flows

Industries

Financial Services· Middle

Transportation & Logistics· Middle

Recommendations

Develop enterprise admin dashboards, reporting and billing features that integrate with backend APIs and payment providers.
Author shared API client libraries and caching layers that dedupe requests and provide invalidate/refresh hooks for modal and dropdown data.
Implement export and document tooling such as PDF/CSV/ZIP generation and packaging for operational workflows like invoicing and sticker orders.
Build developer-facing utilities and modal option caches for large single-page apps to reduce redundant network traffic and improve UX in heavy-modal workflows.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

dora-admin sartor-super-admin Sartor-CRM

Job preferences

Work permits: Nigeria
Citizenship: Nigeria
Employment type: Full-Time