Tunji is available for hire
Hire TunjiTunji Ayoola
Verified Expert in Engineering
Full-stack Developer
Lagos, Nigeria
Toptal member since January 17, 2017
Bio
Tunji is a senior software engineer with 10+ years of experience building scalable platforms across fintech, healthcare, telecom, SaaS, and CMS ecosystems. He specializes in full-stack engineering, cloud infrastructure, DevOps, platform modernization, and systems architecture. Tunji has a strong track record of delivering secure, high-performance applications and leading complex technical initiatives.
Portfolio
Borderless
Ruby on Rails 8, React, Tailwind CSS, Shadcn, Stripe API...
Toptal Clients
WordPress, WooCommerce, Unit Testing, REST APIs, PeopleSoft, Authorize.net...
Vednode Integrated Services
MariaDB, PHP-FPM, NGINX, Varnish, Plesk, Redis, Memcached, Cloudflare, Linux...
Experience
- Ruby - 8 years
- PHP - 8 years
- JavaScript - 8 years
- Payment APIs - 8 years
- System Administration - 8 years
- PostgreSQL - 8 years
- Digital Payments - 6 years
- Google Maps - 5 years
Preferred Environment
Windows, Windows Subsystem for Linux (WSL), Visual Studio Code (VS Code), PHP
The most amazing...
...project I've worked on is a platform migration that handles tens of millions of daily visits on a scalable cloud infrastructure, cutting costs by 40%.
Work Experience
Senior Software Engineer
2025 - PRESENT
Borderless
- Led the architecture and delivery of an investment platform supporting onboarding, wallets, funding, and portfolio workflows.
- Designed scalable payment and wallet infrastructure integrating Stripe and Bridge for secure financial operations.
- Implemented Auth0 authentication and fine-grained RBAC across investor, admin, and community workflows.
- Improved maintainability with service-layer architecture, background jobs, caching, and reusable UI systems.
Technologies: Ruby on Rails 8, React, Tailwind CSS, Shadcn, Stripe API, Know Your Customer (KYC), APIs, Railway, Sidekiq, Stablecoins, Auth0, PostgreSQL, Figma, Ruby, SQL, Ruby on Rails (RoR)
Senior Software Developer
2017 - PRESENT
Toptal Clients
- Automated repeated tasks and deployments for clients using CI/CD tools and integrations such as GitHub Actions, Bitbucket Pipelines, and Jenkins.
- Created dynamic UIs using Vue and React for real-time dashboards, CMS extensions, and crypto visualizations.
- Refactored legacy systems and migrated applications to modern technology stacks, reducing technical debt and improving system performance.
- Facilitated and led knowledge-sharing sessions to ensure there were no knowledge gaps across several teams.
- Developed several WordPress themes from provided designs and extended themes following best practices using child themes, among other features provided by WordPress for building the front end.
- Evaluated and advised on a solution built to handle hosting infrastructure for WordPress applications using Docker, NGINX, and PHP-FPM, with a focus on security and performance optimizations.
- Integrated multiple third-party services, enabling seamless interactions between internal systems and external APIs, including payment gateways, search provision, and CRMs.
Technologies: WordPress, WooCommerce, Unit Testing, REST APIs, PeopleSoft, Authorize.net, WooCommerce API, WP All Import, Customer.io, Amazon Bedrock AgentCore, Sage, Vue, Supply Chain Management (SCM), React, SOAP, WP-CLI, CI/CD Pipelines, Jenkins, WordPress Themes, WordPress Plugins, Databases, Beaver Builder, API Integration, Localization, Fishbowl, Task Scheduling, Job Schedulers, eCommerce, Commerce, Laravel, Zoho, GraphQL, SQL, Ruby on Rails (RoR), PHP
Software/DevOps Consultant
2014 - PRESENT
Vednode Integrated Services
- Migrated clients from shared hosting to scalable cloud infrastructure across AWS, DigitalOcean, Linode, and Rackspace.
- Developed WooCommerce payment gateway plugins for local banking integrations and secure transactions.
- Reduced infrastructure costs by 40% while scaling a high-traffic platform serving millions of daily visits.
- Worked with several local startups to assess and conduct technical interviews for prospective hires.
- Built an eCommerce SPA store using Vue and Laravel. The store has an admin portal that integrates with the Fishbowl API to manage store inventory, products, and orders.
- Built and maintained a scalable infrastructure using Docker, Redis, NGINX, and automated provisioning tools.
- Developed an LLM-powered knowledge base using RAG, vector embeddings, and document chunking to deliver context-aware responses across proprietary company data.
Technologies: MariaDB, PHP-FPM, NGINX, Varnish, Plesk, Redis, Memcached, Cloudflare, Linux, System Administration, Databases, Payment APIs, Payment Gateways, Vue, Laravel, SQL, Ruby on Rails (RoR), Artificial Intelligence (AI), RAG Systems, Vector Databases, LLM Integration, PHP
Full-stack Engineer
2021 - 2024
IQVIA
- Built healthcare and research applications with scalable APIs, optimized queries, and Dockerized infrastructure.
- Conducted detailed code reviews to ensure adherence to standards, fix issues, and add features quickly.
- Automated repetitive tasks using tools like GitHub Actions to improve workflow efficiency for the development team.
- Developed gamification features that increased user engagement by 25% for a COVID-19 research platform.
- Developed operational software for tracking COVID-19 workflows across major U.S. sports organizations.
- Built drag-and-drop query tools enabling researchers to create complex medical data filters visually.
Technologies: Azure, Laravel, Vue, JavaScript, ECharts, GitHub Actions, APIs, Docker, Test-driven Development (TDD), PHPUnit, HIPAA Compliance, PostgreSQL, HIPAA, PHP
Senior Software Consultant
2022 - 2022
Missaan Fintech LCC
- Conducted detailed code reviews to ensure adherence to standards and fix existing bugs. Shared feedback and recommendations with the team, and personally implemented some of the suggested improvements.
- Modernized back-end infrastructure and deployment workflows for a fintech social trading platform.
- Implemented secure VPN connectivity with a national banking partner using strongSwan infrastructure.
- Resolved a recurring issue with Docker Sentry, affecting communication between the application servers and the APM.
- Reduced processing overhead by over 65% using a message broker architecture for vendor integrations.
- Increased deployment efficiency by 40% through automated backup and server-management workflows.
Technologies: JavaScript, Laravel, MySQL, RabbitMQ, Docker, Laravel Forge, Sentry, VPN, Automation, Technical Leadership, Databases, API Integration, Code Review, PHP
Full-stack Developer
2017 - 2021
Undertow Creative
- Replatformed a legacy .NET and MS SQL application to WordPress, migrating data, customers, subscriptions, and payment data. Subscriptions and legacy card details were also migrated to Stripe.
- Reduced complex search response times to under 5 seconds through indexing and query optimization.
- Built dynamic search experiences with Vue, Google Maps, and Algolia-powered search infrastructure.
- Built a reporting tool leveraging application events to collect custom data so administrators can review users' preferences, options, and changes to this data over time in real time.
- Automated deployments using Jenkins CI/CD pipelines to improve release consistency and reduce risk.
Technologies: WordPress, MySQL, JavaScript, Vue, Algolia, Stripe, Google Maps, HTML5, Databases, API Integration, Search Systems, PHP
Senior Software Engineer
2018 - 2019
Estate Intel
- Supported onboarding, interviews, and technical coordination across active engineering workstreams.
- Led migration from WordPress to a Laravel and Vue platform to improve scalability and maintainability.
- Developed interactive real-estate mapping tools with Google Maps integrations and spatial analytics.
- Developed custom content management tools, including bulk content editing capabilities and admin dashboards, integrating with 3rd-party services and streamlining operations for platform administrators.
- Built headless CMS workflows using REST APIs and single sign-on for streamlined content delivery.
Technologies: JavaScript, Vue, Laravel, Blade Templates, WordPress, Laravel Forge, Amazon Web Services (AWS), Technical Leadership, Leadership, WordPress REST API, REST APIs, APIs, Databases, API Integration, Google Maps, PHP
Software Solutions Engineer
2014 - 2016
MTech Communications, Ltd.
- Built large-scale subscription systems supporting millions of SMS users and automated content delivery.
- Led migration of Ghana’s subscription platform to improve scalability, uptime, and operational reliability.
- Designed and implemented an automated backup workflow using server tools and AWS API to rotate local logs to S3.
- Built ELK-based analytics pipelines for processing and visualizing gigabytes of SMS log data.
- Contributed to a monitoring solution using Nagios and built custom connectors to monitor and send notifications based on predefined events.
- Developed campaign management tools, improving operational reporting and campaign execution workflows.
Technologies: SOAP, Amazon Web Services (AWS), PostgreSQL, CSS, HTML, JavaScript, Logstash, CentOS, Databases, Elasticsearch, Kibana, Nagios, PHP
Experience
Paystack PHP API Wrapper
https://github.com/ayoolatj/paystack-phpBuilt and maintained an open-source PHP SDK for integrating with the Paystack payment platform, simplifying payment workflows for developers and businesses integrating online payments into their applications. The library provided clean abstractions for transactions, customer management, payment verification, subscriptions, and API communication while improving developer experience and reducing implementation complexity. The project helped developers integrate Paystack services more efficiently across PHP and Laravel applications.
SMS Logs Analysis and Visualization
Built a real-time log analysis project using the Elastic Stack. Archived data were manually processed and added to the system for historical analysis.
Data were processed and grouped by MSISDN, and an API was created, which can be used to query records by different fields and collate totals, among other functions.
Data were processed and grouped by MSISDN, and an API was created, which can be used to query records by different fields and collate totals, among other functions.
Cryptocurrency Aggregation API
Built a cryptocurrency pricing and aggregation API that collected market data from multiple exchanges to power real-time price tracking, alerts, charts, and visualization tools. Designed scalable synchronization workflows and optimized data-processing pipelines for handling rapidly changing pricing information across multiple providers. The platform supported front-end visualization systems, ticker updates, and analytical tooling for cryptocurrency-focused applications and trading experiences.
Community Investment Platform
Led the architecture and development of a fintech investment platform supporting investor onboarding, identity verification, wallet provisioning, funding workflows, withdrawals, and portfolio management. Designed scalable back-end systems and integration patterns connecting multiple financial providers while maintaining secure and reliable transaction flows. Implemented role-based access controls, engagement systems, and portfolio tracking features while improving maintainability through service-layer architecture, background job processing, caching strategies, and reusable front-end systems.
Education
2008 - 2013
Bachelor of Technology Degree in Computer Science and Technology
Bells University of Technology - Ogun State, Nigeria
Skills
Libraries/APIs
Vue, React, WooCommerce API, Google Maps, REST APIs, Stripe, WordPress REST API, Authorize.net, Sage, Stripe API, Sidekiq
Tools
NGINX, Plesk, Fishbowl, PhpStorm, DataGrip, PHP-FPM, Elastic, Varnish, Logstash, Kibana, RabbitMQ, Sentry, VPN, WP All Import, WP-CLI, Jenkins, ChatGPT, Shadcn, Auth0, Nagios, Figma
Languages
Ruby, PHP, Regex, HTML5, JavaScript, HTML, CSS, SCSS, GraphQL, Python, SQL
Frameworks
Laravel, Ruby on Rails (RoR), PHPUnit, Tailwind CSS
Paradigms
HIPAA Compliance, DevOps, Automation, Unit Testing, Test-driven Development (TDD)
Platforms
WooCommerce, WordPress, Amazon Web Services (AWS), Windows, CentOS, Linode, Algolia, Linux, Docker, Statamic, Visual Studio Code (VS Code), Azure
Storage
PostgreSQL, MySQL, Databases, MariaDB, Redis, Memcached, RDBMS, Elasticsearch
Other
Payment APIs, SMS, System Administration, WordPress Plugins, Payment Gateways, Payment Processing, Digital Payments, Beaver Builder, API Integration, USSD Technology, Laravel Forge, APIs, Localization, Zoho, RHEL, CRM APIs, Blade Templates, Cloudflare, Technical Leadership, Leadership, PeopleSoft, Customer.io, Amazon Bedrock AgentCore, Supply Chain Management (SCM), SOAP, CI/CD Pipelines, WordPress Themes, Pinia, Document Management Systems (DMS), Optical Character Recognition (OCR), OpenAI, Pinecone, Vector Data, Task Scheduling, Job Schedulers, eCommerce, Commerce, Code Review, ECharts, GitHub Actions, Windows Subsystem for Linux (WSL), JetBrains IDE, Ruby on Rails 8, Know Your Customer (KYC), Railway, Stablecoins, Search Systems, Data Aggregation, HIPAA, Artificial Intelligence (AI), RAG Systems, Vector Databases, LLM Integration
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