Ajayi Adeboye Samuel
Full-Stack Developer • Backend Engineer • AI & LLM Engineer
Python/Django • Node.js/Express • LangChain/LangGraph • REST APIs • Authentication • Payments • PostgreSQL/MongoDB
Professional Summary
Results-driven Full-Stack Developer and Backend Engineer with strong experience building scalable web applications, RESTful APIs, and backend systems using Python/Django and Node.js/Express. I specialize in authentication systems, role-based access control, payment integrations, real-time communication, and cloud deployments using PostgreSQL, MongoDB, Docker, and modern DevOps workflows. Beyond engineering, I bring 7+ years of operations and business management experience, allowing me to design software that solves real business problems, not just technical ones. I've since expanded into AI & LLM Engineering, working hands-on with LangChain, LangGraph, and the OpenAI API to build AI evaluation workflows and intelligent backend systems. My recent work spans fintech (a USSD-based lending platform integrating Remita, Monnify, WEMA Bank, and VFD Bank), healthcare payment systems with webhook-secured transaction handling, and AI training/annotation work assessing model outputs. Open to Backend, Full-Stack, and AI-focused roles (remote or hybrid).
Skills Showcase
Technical Skills
Soft Skills
InternPulse Finalist Achievement
Recognized as a top performer in the InternPulse Cohort 5 program, ranking in the top 123 out of 169 participants in Backend Development track.
Tech Path: Backend Development
Issued: December 15th, 2024
Wekume Certificate of Appreciation
Recognized for bringing a wealth of tech knowledge, energy, and drive to Wekume, helping to push the platform forward as a critical tool for university students.
Issued To: Adeboye Ajayi
Joshua Emmanuel Walusimbi
CEO
Bronwyn O'Hara
Exec. Assistant
Introduction to Agents – Certificate of Recognition
Successfully completed the "Introduction to Agents" course, demonstrating rigor, calibration, and clarity in AI agent evaluation.
Issued To: Ajayi Adeboye
Issued By: Brendan Foody, CEO of Mercor
Date Completed: September 14, 2026
Certificate No: MRC-2026-AU9DABQ9
Professional Experience
AI Training & Annotation Contributor
Outlier, Turing (Remote, Freelance)
Jun 2026 – Present
- Labeled datasets and assessed task performance to support the development and evaluation of AI systems.
- Reviewed AI-generated conversations for language accuracy, relevance, and contextual quality against evaluation rubrics.
- Designed and tested prompts while tracking model responses to identify areas for refinement, delivering performance insights that supported continuous model improvement.
Backend Engineer
Ryghtrade Investment Limited
Dec 2025 – Jun 2026
- Architected backend infrastructure for a USSD-based lending platform serving over 20,000 government workers.
- Maintained 99.9% system uptime by optimizing backend reliability, monitoring, and infrastructure deployment.
- Integrated secure financial APIs with Remita, Monnify, WEMA Bank, and VFD Bank to enable secure transactions.
- Reduced API latency by 40% through optimized database queries and backend performance tuning.
Frontend Developer
Oregon Co. Jewelry E-Commerce (Remote)
Oct 2025 – Dec 2025
- Built a production-ready jewelry e-commerce landing page with pixel-perfect responsive design across mobile and desktop, including a fixed header, mobile accordion navigation, and mega-menu dropdowns.
- Engineered an animated hero section with auto-rotating and manual drag-to-rotate interactions using Framer Motion.
- Built infinite auto-scrolling carousels for product and content sections across mobile and desktop.
Software Engineer
Healthcare Appointment & Payment System (Remote)
Jun 2025 – Oct 2025
- Architected a healthcare appointment management system with consultation workflows and dynamic pricing logic.
- Designed secure role-based access control (Admin/Patient) using JWT authentication with refresh token rotation.
- Engineered a transactional payment engine supporting deposits, partial payments, multi-transaction tracking, and automated balance reconciliation.
- Integrated Paystack with HMAC webhook signature verification and idempotent webhook handling, building safeguards against overpayments and duplicate charges.
Full-Stack Developer
AMA Fashion E-commerce Platform
Dec 2024 – Jun 2025
- Architected and implemented a complete online fashion store using Next.js (App Router) for both frontend and robust API Routes backend, ensuring a seamless shopping experience.
- Successfully integrated Stripe and PayPal APIs to facilitate secure, multi-currency transactions (AED, GBP, USD), managing complex checkout sessions, handling asynchronous webhooks for payment verification, and ensuring accurate order finalization and database recording.
- Developed a sophisticated backend with Neon (PostgreSQL) for real-time stock tracking, dynamic pricing, and a critical "Buy Now + Pre-Order" logic, enabling sales of both in-stock and future-available items, and handling mixed-cart scenarios with precise quantity allocation.
- Streamlined post-purchase workflows by automating order creation, precise stock deduction upon payment confirmation, and dispatching comprehensive email notifications (order confirmation, shipping updates, delivery alerts, vendor notifications) via Resend and Nodemailer.
- Built a powerful admin interface utilizing Next.js Server Actions for efficient management of product inventory (add, edit, delete), real-time quantity and status updates, pre-order date settings, and detailed order status tracking (New, Processing, Completed, Shipped, Delivered, Cancelled, Refunded, On-Hold).
- Managed database schema evolution and data integrity through custom migration scripts, ensuring smooth transitions and reliable data storage.
- Crafted an elegant, mobile-first user experience using Shadcn/UI and Tailwind CSS, ensuring seamless and accessible shopping across all devices.
- Leveraged Vercel for continuous integration and deployment, ensuring high performance, scalability, and reliability of the e-commerce platform.
Backend Developer
Chat Service Platform (Personal Project)
Apr 2025 – Present
- Architected enterprise-grade authentication with JWT, refresh tokens, and multi-device sessions.
- Built comprehensive social features supporting celebrity-scale user bases (millions of connections) with intelligent pagination and real-time friend discovery.
- Implemented Swagger/OpenAPI documentation with Bearer token auth, reducing integration time by 70%.
- Designed friend request system handling bulk operations, mutual friend discovery, and advanced user search with smart filtering.
- Developed production features: user management with real-time online tracking, scalable pagination (20-25 items per endpoint), and enterprise-grade admin interface.
- Implemented security features: rate limiting, throttling, account deactivation/deletion, secure logout with token blacklisting.
- Integrated Africa's Talking API for multi-factor authentication.
- Achieved 100% test coverage with 26+ comprehensive test cases across authentication and friend management.
- Optimized database with strategic use of select_related() and prefetch_related() for celebrity-scale performance.
- Designed independent, scalable microservices across authentication, friend management, and messaging (in development).
Backend Developer
Wekume Project (Remote)
Jun 2024 – Dec 2024
- Architected enterprise-grade authentication microservice with JWT, refresh tokens, and multi-device sessions.
- Implemented Swagger/OpenAPI documentation with Bearer token auth, reducing integration time by 70%.
- Built production-ready user management with real-time online tracking and scalable pagination.
- Developed security features: rate limiting, throttling, deactivation, deletion, password recovery.
- Integrated Africa's Talking API for SMS multi-factor authentication.
- Achieved 100% test coverage with comprehensive test cases.
- Designed microservices architecture for scalable services across authentication, messaging, and user management.
Backend Developer
InternPulse (Remote)
Feb 2024 – Jun 2024
- Designed scalable APIs for library systems, healthcare, and inventory.
- Implemented advanced filtering and automated data scraping with Selenium.
- Built financial analytics APIs delivering real-time insights.
Operations Support
Premier Lottery (Lagos)
2017 – 2024
- Managed operations across 50+ outlets, boosting efficiency and revenue by 20%.
- Led budgeting and compliance audits to reduce regulatory risks.
Intern (Forage Program)
Accenture North America (Remote)
Sep 2023
- Cleaned datasets, generated insights, and created data visualizations.
Key Projects
Dental Clinic Appointment & Payment System
Production-ready backend system for dental clinics featuring authentication, email verification, appointment booking, and Paystack payments.
Utmost Healthcare Solutions LLC Website
A professional Next.js website for a home healthcare provider, showcasing their services, mission, and values with a focus on compassionate care.
AMA Fashion E-commerce Platform
A comprehensive full-stack e-commerce solution designed to facilitate online sales of luxury African fashion, featuring secure multi-currency payment processing, advanced real-time inventory management with pre-order capabilities, and fully automated order fulfillment.
Oregon Co. Jewelry E-Commerce Landing Page
A premium jewelry e-commerce landing page built from scratch, replicating the design quality and functionality of a top US jewelry brand fully responsive across mobile and desktop.
Chat Service Microservices Architecture
A scalable chat service with enterprise-grade authentication, friend management, and interactive API documentation.
Wekume Authentication System
A secure JWT-based authentication system with profile management and password recovery.
Dolapo Udekwe Makeup Artist Website
Full-stack Next.js website for a professional makeup artist with online booking.
Financial Analytics for Renergy Hub
Real-time financial analytics system
Technical Skills
Languages
Frameworks & Libraries
Databases & Caching
APIs & Authentication
Payments & Financial APIs
Cloud, DevOps & Tools
API Documentation & Testing
AI / LLM Engineering
Other
Core Competencies
API Architecture
Designs scalable, well-documented RESTful APIs built for high performance and long-term maintainability.
Social Features
Implements friend systems, user discovery, and real-time social interactions.
Security
Applies secure authentication, access control, and webhook signature verification using industry best practices.
Documentation
Creates clear, developer-friendly API documentation with interactive testing.
Problem Solving
Resolves complex backend challenges involving authentication, scalability, and system reliability.
Team Collaboration
Builds production-ready systems that integrate smoothly with frontend and product teams.
Performance Optimization
Optimizes databases, queries, and pagination for efficient large-scale applications.
E-commerce Solutions
Develops full-featured e-commerce platforms with payments, inventory management, and order processing.
AI / LLM Engineering
Builds AI-powered workflows and evaluation pipelines using LangChain, LangGraph, and the OpenAI API.
Education & Certifications
Education
Bachelor of Science in Accounting
Olabisi Onabanjo University (2016)
Diploma in Business Administration
Olabisi Onabanjo University (2009)
Certifications
- Introduction to Agents – Mercor (2026)
- AI Engineer Certification – Udemy (2026)
- AI Model Development & Deployment – Google Cloud (2025)
- InternPulse Cohort 5 Finalist – Backend Development (2023)
- Backend Development with Python Django – Univelcity (2023)
- Data Analytics Professional Program – One Campus Academy (2023)
- Data Analytics Job Simulation – Accenture North America (2023)
Recommendation
"I highly recommend Ajayi Adeboye, who was a backend engineer intern during our 5th cohort at InternPulse. During his time with us, he displayed remarkable technical skills and a strong work ethic. Adeboye contributed significantly to Renergy Hub, a cleantech platform, showing his ability to apply his backend engineering expertise in real-world scenarios. He was always proactive in solving complex problems, and his collaboration with the team was seamless. Adeboye consistently went above and beyond, and his leadership in his role was evident as he contributed to the platform's development and performance."
Djinee John
Founder and Chief Mentor
InternPulse