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I am Stephen Thomas, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications, APIs, and cloud-native systems across fintech and eCommerce. I enjoy solving complex problems with a focus on performance, robust architecture, and delivering high-impact features in distributed teams. I thrive in collaborative environments and love applying AI-driven techniques like LLMs and RAG to automate workflows, improve data-driven decisions, and create delightful developer and user experiences.…I am Stephen Thomas, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications, APIs, and cloud-native systems across fintech and eCommerce. I enjoy solving complex problems with a focus on performance, robust architecture, and delivering high-impact features in distributed teams. I thrive in collaborative environments and love applying AI-driven techniques like LLMs and RAG to automate workflows, improve data-driven decisions, and create delightful developer and user experiences.

Stephen Thomas

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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I am Stephen Thomas, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications, APIs, and cloud-native systems across fintech and eCommerce. I enjoy solving complex problems with a focus on performance, robust architecture, and delivering high-impact features in distributed teams. I thrive in collaborative environments and love applying AI-driven techniques like LLMs and RAG to automate workflows, improve data-driven decisions, and create delightful developer and user experiences.…I am Stephen Thomas, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications, APIs, and cloud-native systems across fintech and eCommerce. I enjoy solving complex problems with a focus on performance, robust architecture, and delivering high-impact features in distributed teams. I thrive in collaborative environments and love applying AI-driven techniques like LLMs and RAG to automate workflows, improve data-driven decisions, and create delightful developer and user experiences.

Available to hire

I am Stephen Thomas, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications, APIs, and cloud-native systems across fintech and eCommerce. I enjoy solving complex problems with a focus on performance, robust architecture, and delivering high-impact features in distributed teams.

I thrive in collaborative environments and love applying AI-driven techniques like LLMs and RAG to automate workflows, improve data-driven decisions, and create delightful developer and user experiences.

Skills

Experience Level

Expert

Expert

Expert

Expert

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Expert

Language

English

Fluent

Work Experience

Senior Full Stack Engineer at Finastra

July 1, 2022 - Present

Led backend development of Node.js and GraphQL microservices using Express and Redis, supporting payments, loans, and real-time transaction data. Developed micro frontends using React, TypeScript, and Tailwind CSS; improved peak time payment performance by 40% through caching redesign and routing optimizations. Shipped mobile features in React Native including biometric login, offline support, and fraud alerts. Automated onboarding and compliance workflows using OpenAI for document processing and identity extraction, reducing manual review by 30%. Implemented RAG pipelines with LLMs to support payment compliance and fraud checks, improving speed and accuracy. Delivered AWS native solutions using Lambda, API Gateway, ECS, S3, and DynamoDB while meeting PCI compliance. Mentored junior engineers and collaborated with stakeholders to build fintech SaaS features.

Senior Full Stack Engineer

May 1, 2019 - June 30, 2022

Built a multi-tenant e-commerce platform using React, Next.js, and Tailwind CSS. Developed GraphQL and REST APIs with Python and Django for catalog, cart, and order features. Implemented PostgreSQL row-level security and Prisma tenancy isolation for multi-tenant operations. Integrated Stripe for multi-tenant payments, reducing payment failures during high-traffic periods. Added Redis rate limiting and throttling to stabilize platform during peak load. Introduced CI/CD with GitHub Actions, reducing deployment time by 50%. Fixed recurring seasonal performance issues with tenancy-aware caching and improved load distribution. Mentored juniors; collaborated with stakeholders to deliver fintech SaaS features.

Full Stack Engineer at Valtech

August 1, 2016 - April 30, 2019

Built analytics dashboards using Vue.js, D3, and Highcharts for internal and client reporting. Created Flask APIs for real-time and historical data. Designed data pipelines with Kafka and Kubernetes to reduce dashboard latency. Managed AWS infrastructure including EC2, S3, and RDS. Added SAML SSO support for enterprise security requirements.

Full Stack Engineer at Wiredmark

January 1, 2015 - July 31, 2016

Built digital marketing and automation tools using Laravel and MySQL. Created reusable Bootstrap UI components to reduce campaign setup time by 40%. Added Google Analytics tracking and UTMs for campaign attribution. Set up CI/CD using Circle CI and Heroku.