Jeffrey Sweeney
@jeffreysweeney
Senior full-stack/front-end developer focused on performant, maintainable web apps.
What I'm looking for
I am a self-motivated senior software developer with extensive full-stack and front-end experience building production web applications using React, Next.js, Node, and PostgreSQL. I have led front-end development, architected databases, implemented real-time features, and integrated third-party services like Stripe and SendGrid.
I have delivered projects across healthcare, SaaS, e-commerce, and enterprise domains, including AI-driven collaboration tools, mental-health assessment interfaces, and performance-focused site rewrites. I routinely improve performance metrics (INP, TBT), migrate large codebases to modern frameworks, and introduce testing and documentation practices.
I collaborate closely with teams as a tutor, mentor, and lead, onboarding new hires and improving developer workflows; I seek roles where I can continue to build scalable user experiences, mentor others, and solve complex front-end and full-stack challenges.
Experience
Work history, roles, and key accomplishments
Senior Front-end Developer
Sago
Apr 2025 - Present (11 months)
Developed the front-end of Query AI enabling moderators to prompt AI about recorded meetings and discussions; maintained Qualboard and integrated new AI-driven features while authoring onboarding documentation and mentoring new hires.
Added features and fixed bugs across Reddit Pro and site components, implemented in-call media sharing improvements to enable higher quality 1:1 video and assisted with onboarding and developer environment setup.
Full-stack Developer
MD Calc
Feb 2025 - Mar 2025 (1 month)
Architected and designed a NextJS + PostgreSQL SaaS single-page application on AWS and implemented Stripe integration while documenting subscription refund processes and applying security fixes.
FS Node + React Developer
Lumber Marketplace
Dec 2024 - Feb 2025 (2 months)
Implemented NextJS + PostgreSQL architecture for a SaaS SPA, applied fixes and enhancements to an established web and mobile platform, and documented platform changes.
Front-End Performance Dev
Optimal
Jun 2024 - Dec 2024 (6 months)
Audited homepage, PDP, and cart/checkout pages, implemented site load, INP and TBT performance improvements, and upgraded a NextJS 10 POC to NextJS 14 for performance gains.
Front-end React Developer
Montgomery Psychiatry
Mar 2024 - Dec 2024 (9 months)
Developed a dynamic multiple-choice mental health assessment form and a static public NextJS site for patients and businesses; integrated server-sent events for live updates across browsers.
Senior Software Engineer
Sorcero
Nov 2021 - Mar 2024 (2 years 4 months)
Led front-end development on a Vue-based Medical Insights Management service, created interactive visualizations and an internal messaging/notification service using WebSockets, and modified Python APIs to supply visualization data.
Full-stack Developer
XplorStem
Jul 2023 - Sep 2023 (2 months)
Implemented full-stack features and consulted on best practices for planned site features while addressing Shopify plugin issues and improving site functionality.
Full-stack Developer
Shooting Academy CA
Jul 2022 - Jan 2023 (6 months)
Built Shopify widgets for customizing products, developed role-based authentication for a NextJS site, integrated SendGrid, and created local Docker development setups.
Front-End Developer
Candy
Sep 2021 - Oct 2021 (1 month)
Contributed front-end development work on short-term engagements focusing on UI implementation and component integration.
Solutions Engineer
Anthem
Oct 2020 - Oct 2021 (1 year)
Worked as a solutions engineer delivering integrations and technical solutions for clients during a multi-year engagement.
Front-end Developer
Topshelling
Jun 2021 - Jul 2021 (1 month)
Delivered front-end development tasks during a short-term engagement emphasizing UI and interaction improvements.
Front-end Developer
Imperial College London
Jun 2021 - Jul 2021 (1 month)
Implemented front-end features for academic projects during a short-term engagement focused on usability and accessibility.
Developer
Health Data Movers
May 2020 - Oct 2020 (5 months)
Developed features for data-driven applications, contributing to front-end and back-end tasks for medical data workflows.
Vue Engineer
Raven Black
Jan 2020 - May 2020 (4 months)
Built Vue-based interfaces and components during a contract engagement focused on interactive UI elements.
Front-End Developer
Litify
Jul 2019 - Jan 2020 (6 months)
Implemented front-end features and collaborated on UI improvements for the Litify platform.
Tutor
Eduonix
Mar 2019 - May 2019 (2 months)
Delivered hands-on tutoring for web development topics, guiding students through practical coding exercises and best practices.
Senior Front-end Developer
Avid Technologies
Mar 2013 - Jan 2019 (5 years 10 months)
Led front-end development initiatives over a multi-year tenure, modernizing legacy applications and integrating new front-end technologies and testing frameworks.
Education
Degrees, certifications, and relevant coursework
Jeffrey hasn't added their education
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Tech stack
Software and tools used professionally
Availability
Location
Authorized to work in
Website
jsweeneydev.comJob categories
Skills
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