Jaohar Oseni • Ireland • Senior Software Engineer

I build software that scales, performs, and delivers business value.

I help companies ship reliable, modern digital products with strong architecture, clean delivery, and measurable impact. From payments and fintech platforms to SaaS products and AI-enabled workflow automation, I bring the technical depth to solve complex problems and the leadership to move teams forward.

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  • Full-stack product engineering
  • Microservices & cloud architecture
  • Payments, AI automation & delivery
Jaohar Oseni

Current focus

Senior Software Engineer at Prommt

Delivering secure payment integrations, AI-enabled workflow automation, and modern product platforms with strong engineering standards and real-world impact.

About

Experienced engineer with a product mindset and strong delivery focus.

I bring a strong mix of technical depth, architectural thinking, and team leadership. My experience spans full-stack engineering, cloud-native systems, mobile platforms, and performance-focused delivery across startup and enterprise environments.

Experience

Senior Software Engineer — Prommt

Nov 2024 – Present • Product Engineering

  • Architected PCI-compliant payment integrations across card and bank solutions to enable secure transaction processing for financial technology platforms.
  • Integrated AI agents into repetitive workflows to automate code testing and custom template generation.

Software Engineer — Catapult

Aug 2020 – Oct 2024 • SaaS and mobile platforms

  • Led the implementation of a subscription-based strategy that increased customer retention and average contract value by 50% in the first year.
  • Designed a cloud-based SaaS platform for athlete performance analysis and game management, improving reliability and scalability by 40%.
  • Developed a mobile application integrated with FIFA-approved GPS wearable tracking devices, delivering real-time player insights and coaching support.
  • Built automated CI/CD pipelines with Jenkins and GitHub Actions to accelerate deployments and reduce downtime.

Software Engineer — Seamfix

Jan 2016 – Aug 2019 • Identity and digital onboarding

  • Led the migration of a legacy monolithic application to a microservices architecture, improving scalability, flexibility, and maintainability by over 40%.
  • Led a cross-functional team of 8 engineers across frontend, backend, QA, and DevOps to deliver a multi-platform KYC registration module.
  • Mentored junior developers and led knowledge-sharing sessions to strengthen team capability and engineering standards.

Fintech Systems Integration Engineer — Appzone

May 2014 – Dec 2015 • Financial technology integrations

  • Delivered PCI DSS-compliant integrations for card management and correspondent banking systems.
  • Integrated core, internet, and mobile banking services that improved transaction speed and customer satisfaction.

Expertise

Core strengths

Full-stack development, microservices architecture, fintech integrations, team leadership, agile delivery, mentoring, and performance optimization.

Languages

Java, Go, Python, JavaScript, TypeScript, PHP, C#

Web & mobile

React, Angular, Spring Boot, Node.js, React Native, iOS

Cloud & DevOps

AWS, Azure, Google Cloud, Docker, Kubernetes, Terraform, Jenkins, GitHub Actions, Ansible

Selected highlights

Cloud cost optimization

Partnered with DevOps teams to transition from on-prem to cloud-native solutions on AWS, reducing infrastructure costs by 40%.

Database and platform optimization

Designed a complex database migration and versioning strategy for a Go-based project, improving efficiency and reducing dependencies.

Performance improvements

Refactored code to reduce unnecessary API calls and re-renders, cutting load times by 50% and improving the user experience.

Contact

Let’s build something impactful together.

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