OLAYINKA KAREEM
SENIOR .NET FULL-STACK ENGINEER | TECH LEAD
Leeds | - |-| LinkedIn | Github
PERSONAL SUMMARY
Pragmatic results driven Senior Full-Stack .NET Engineer and Technical Lead with over 10 years of experience in
.NET, C#, SQL Server, and frontend development, specialising in architecting, developing and delivering scalable
enterprise solutions, distributed systems, and high-performance digital products used by millions of users.
Proven track record of leading large-scale engineering initiatives across FinTech and EdTech, delivering measurable
improvements in performance and operational efficiency.
SKILLS
• Cloud & Architecture: Azure (App Services, Functions, Service Bus, API Management, AKS, Application
Insights, Key Vault), Microservices Architecture, Domain-Driven Design (DDD), Event-Driven Architecture,
CQRS, Clean Architecture, RESTful APIs, System Design, Vertical-Slice-Architecture, AWS S3, AWS ECS,
• Backend: C#, .Net Framework, .NET Core, .NET 6/7/8, ASP.NET MVC, Entity Framework Core, Dapper,
SignalR, Web API, LINQ, Rest-API, GraphQL, GRPC, Node, ExpressJS, NestJS, TypeOrm, Prisma, X-Unit,
N-Unit, Ms-Test, Specflow, Redis,
• Frontend: Angular 12+, React.js, TypeScript, JavaScript, HTML5, CSS3, Bootstrap, Responsive Design,
ASP.Net Razor, Windows Form, WPF, Jest, RTL, Playwright
• Databases: SQL Server, PostgreSQL, MongoDB, Redis, Azure Cosmos DB, Azure Service Bus, RabbitMQ,
DynamoDB
• DevOps: Azure DevOps, CI/CD Pipelines, Docker, Kubernetes, Git, Terraform, YAML Pipelines, AWS EC2,
AWS EBS,
• Project Management: Agile/Scrum, Test-Driven Development (TDD), BDD, Code Reviews, Pair
Programming, Technical Mentoring, JIRA, Kanban
EXPERIENCE
Senior Full-Stack Engineer
07/2022
Renaissance Global
Durham, United Kingdom
• Improved system performance by 45% and reduced API response times from 850ms to 180ms through
query optimisation, caching (Redis), and async processing.
• Architected an event-driven distributed scoring system serving 45K+ users across 8+ countries with
99.9% uptime.
• Developed and optimised a CI/CD YAML Pipeline to deploy code changes, database versioning across 4
environments, reducing deployment errors by 70% and eliminating manual release processes.
• Mentored engineers and improved team delivery velocity by 60% through structured code reviews and
technical guidance.
• Led delivery of a scalable Wonde API integration 6 weeks ahead of schedule, onboarding 5,000+ schools
and 10M+ students, generating £250K+ annual revenue, and reducing import-related incidents by 80%.
Tech-Lead (DevOps): Consultant Part-Time
04/2024 to 12/2025
Intent Technologies Ltd
Leeds, United Kingdom
• Architected and led end-to-end delivery of two large-scale platforms (Multi-tenant Conference Portal & AIdriven Home Adaptation System), owning design, deployment, and monitoring across backend, frontend, and
DevOps.
• Partnered with stakeholders (Foundation UK) to define requirements, assess risks, and guide a crossfunctional team to deliver scalable, production-ready solutions aligned with business objectives.
• Delivered a cloud-native platform supporting 100+ concurrent conferences and 10,000+ users, reducing
operational overhead by 50%.
• Built an AI-driven recommendation system serving 5,000+ users, improving service delivery efficiency by
60% and reducing manual errors by 70%.
Senior Full-Stack Engineer
11/2021 to 06/2022
Cognizant Technology Solutions
Gdansk, Poland
• Improved frontend performance of an enterprise HR portal by 40%, accelerating feature delivery by 35%
through reusable React architecture and mentoring junior developers.
• Refactored critical microservices and introduced unit/integration testing, reducing regression issues by 70%
and improving long-term maintainability.
• Stabilised production systems for automotive and enterprise platforms, reducing defect rates to less than
10% while mentoring engineers on microservices design and performance optimisation.
Lead Full-Stack Engineer (Remote Contract)
03/2020 to 11/2021
Top-Rate Transfer PTY LTD
Rosebery, Australia
• Built and scaled a monolithic FinTech platform to 50,000 users, then led its evolution into 11 microservices
(.NET Core + React), accelerating development by 40% and delivering the solution 3 months ahead of
schedule.
• Designed domain-driven microservices architecture, leading a team of 5 engineers from requirements to
production deployment.
• Implemented AML/KYC integrations and a custom fraud monitoring system, reducing suspicious transaction
resolution time by 60%.
• Architected and deployed cloud-native infrastructure on Kubernetes, later optimising hosting costs by 80%
while maintaining 99.9% uptime through proactive monitoring and observability.
Software Developer (Team Lead)
04/2019 to 03/2020
Cloud23 Tech Solutions Ltd
Ibadan, Nigeria
• Led end-to-end delivery of client software solutions, managing stakeholder requirements and directing a
cross-functional team of 5 engineers, achieving 95% on-time delivery, improved development efficiency by
30%, and consistently meeting client business objectives.
Frontend Developer
Aella Credit
• Contributed to the development of a React-based HR portal
09/2018 to 03/2019
Lagos, Nigeria
Software Developer (Full-Stack)
De-Cloud 23 Technologies Ltd
03/2015 to 03/2018
Ibadan, Nigeria
EDUCATION
Master's Degree: Cloud Computing
Warsaw School of Computer Science
Distinction (Bardzo Dobry)
06/2022
Warsaw, Poland
Bachelor's Degree: Computer Science
09/2013
Ladoke Akintola University of Technology
Ogbomosho, Nigeria
GPA: Second Class Upper: Top 5%. Best Student, Department of Computer Science (300 Level, 2011)
CERTIFICATIONS
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Microsoft Certified Window Server 2008 Active Directory (MCTS),-
AWS Certified Cloud Practitioner (AWS CCP),-
Microsoft Certified Azure Fundamentals (AZ 900),-
Scrum Alliance Certified ScrumMaster (CSM),-
LANGUAGES
Languages: English (Fluent), Yoruba (Native)
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