Oluseun Oyeleke
Senior Backend Engineer
United Kingdom +44 7778 151558 oyelekeseun@outlook.com LinkedIn GitHub Portfolio
Professional Summary

Full-Stack Software Engineer with 6+ years' experience designing, developing and maintaining scalable applications across fintech, healthcare, AI, and enterprise solutions. Strong expertise in PHP, Laravel, Python, React and API integrations, with recent hands-on experience building AI-powered SaaS tools using OpenAI. Proven track record of delivering robust systems, improving performance and collaborating within agile teams to meet business goals.

Core Skills
Languages & Frameworks: PHP, Laravel, Python, FastAPI, JavaScript, React, Vue.js, Node.js
Databases: MySQL, PostgreSQL, MongoDB, SQL Server, Redis
APIs & Integrations: RESTful APIs, GraphQL, OpenAI API, SendGrid, Stripe, Paystack, Flutterwave
DevOps & Cloud: Docker, CI/CD, Vercel, Azure, Apache, Nginx, GitHub Actions
Testing & Docs: PHPUnit, Postman, Swagger/OpenAPI, Pytest
Security & Auth: HTTPS, JWT, OAuth 2.0, Data Encryption
AI / ML Tooling: OpenAI GPT-4, Prompt Engineering, PDF/DOCX Processing, ATS Optimisation
Collaboration: Git, GitHub, GitLab, Bitbucket, Jira, Trello, Agile/Scrum
Professional Experience
Full-Stack Developer & AI Engineer Intern New Jan 2026 – Feb 2026
AI CV Tailoring Tool β€” Weeply, United Kingdom
  • Designed and built an AI-powered SaaS CV tailoring application from scratch using Python (FastAPI) and React, deployed on Vercel.
  • Integrated OpenAI GPT-4 to intelligently analyse CVs and job descriptions, generating ATS-optimised, keyword-aligned tailored CVs in real time.
  • Built a Python PDF/DOCX parsing pipeline using pdfplumber and python-docx, with async PDF generation via WeasyPrint.
  • Implemented robust email notification system using SendGrid HTTP API with retry logic and async threading.
  • Created a responsive React frontend with light/dark mode, multi-step UX, real-time CV preview and download functionality.
  • Deployed the full-stack application on Vercel with environment variable management and custom API routing (vercel.json).
  • Collaborated on backend and frontend development projects in a fast-paced environment.
  • Contributed to codebase improvements and bug fixes.
  • Gained hands-on experience with modern development practices and agile workflows.

Skills: Python, FastAPI, React, OpenAI API, SendGrid, WeasyPrint, pdfplumber, Vercel, Docker, Full-Stack Development, Agile, Collaboration, Code Quality

Senior Backend Engineer Sep 2022 – Dec 2025
Fullware Solutions Limited, Lagos
  • Designed and deployed secure RESTful APIs for fintech and e-commerce solutions.
  • Integrated multiple payment gateways (Stripe, Paystack, Flutterwave, Interswitch), ensuring seamless transaction flows.
  • Improved API performance through query optimisation and caching strategies.
  • Established secure HTTPS protocols for client–server communication.
  • Mentored junior developers and introduced coding best practices, improving team productivity.

Skills: PHP, Laravel, MySQL, RESTful APIs, Payment Gateway Integrations, Docker, Redis, Git, Postman, Swagger, Agile

Backend Engineer Sep 2021 – May 2022
Page Financials (Forsterfields & Griffins Technology Ltd), Lagos
  • Built and maintained backend services for HRMS Payroll and Fintech in a Box solutions.
  • Enhanced application reliability through database optimisation and server-side caching.
  • Delivered new features in collaboration with Product Managers within agile sprints.
  • Ensured security compliance by implementing regular patches and encryption standards.

Skills: PHP, Laravel, MySQL, API Integrations, Redis, CI/CD, HTTPS, GitLab, Jira

Software Engineer Jan 2021 – Oct 2021
Software Business Solutions & Consulting (SBSC), Lagos
  • Developed robust APIs for enterprise and client-facing applications.
  • Supported deployed applications by troubleshooting and resolving end-user issues.
  • Wrote complex SQL queries and stored procedures for efficient data retrieval.
  • Contributed to cloud-hosted solutions leveraging Azure.

Skills: PHP, Laravel, SQL Server, Azure, Git, Agile, API Documentation, Postman

Software Developer Mar 2020 – Mar 2021
Cavidel Limited, Lagos
  • Developed Officemate HR, Accounting, and Hospital applications, integrating them with secure RESTful APIs.
  • Refactored legacy systems into modern architectures, reducing maintenance costs.
  • Collaborated with project managers to deliver major features ahead of deadlines.

Skills: PHP, Laravel, MySQL, RESTful APIs, Git, Microservices, Agile/Scrum

Backend Developer Jan 2019 – Feb 2020
Phosmobile Digital Solutions, Lagos
  • Built APIs for loan management and disbursement platforms using Laravel and GraphQL.
  • Partnered with frontend developers (Vue.js) to deliver seamless user experiences.
  • Designed backend solutions to support secure and efficient e-commerce capabilities.

Skills: PHP, Laravel, GraphQL, MySQL, Vue.js, Git, JWT Authentication

Web Developer Intern Sep 2018 – Dec 2018
HNG Tech, Lagos
  • Assisted in building and maintaining web applications with HTML, CSS, PHP, and Laravel.
  • Implemented user requirements into functional prototypes.

Skills: PHP, Laravel, HTML, CSS, JavaScript, Git

Education

Master's in Computing — University of Sunderland, United Kingdom — 2026

B.Sc. Industrial Chemistry — Obafemi Awolowo University, Ile-Ife, Nigeria — Aug 2017

Notable Projects
AI CV Tailoring Tool (2026, UK) New: Full-stack AI SaaS tool (Python FastAPI + React + OpenAI) β€” ai-cv-tailoring-tool-89cy.vercel.app
Alumunite (2025): Education/alumni platform with private backend repository β€” alumunite.co Β· team-alumunite (private)
Nwantas / Erudite School System (2025): School management platform with private account/core services β€” nwantas.com Β· account service Β· core service
Volunteer Africa (2023): Program and content platform built with PHP/CakePHP β€” volunteer.africa
StagingDC (2023): Full-stack architecture and DB schema implementation β€” stagingdc.com
BulkSMSLive (2022): Bulk SMS platform and API workflows built with Laravel/PHP β€” bulksmslive.com
Inventory System (2022): Internal stock and operations system β€” 66.70.202.147/inventory/#/
Page Financials (2021–2022): Backend services for payroll and HRMS platform β€” pagefinancials.com
Craneburg ERP (2021): Payroll, HR and operations APIs delivered ahead of schedule β€” craneburg.vercel.app
Open-Source and Public GitHub Projects: KPI, Law CRM, Wallet System and Blog RSS β€” github.com/Oluwablin