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Jeffrey Sweeney

@jeffreysweeney

Senior full-stack/front-end developer focused on performant, maintainable web apps.

United States
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What I'm looking for

I want a full-time role building performant, user-focused web apps where I can lead frontend architecture, mentor teammates, and solve complex cross-stack problems.

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

SA
Current

Senior Front-end Developer

Sago

Apr 2025 - Present (1 year 2 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.

Reddit logoRE

Front-end Developer

Mar 2025 - Apr 2025 (1 month)

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.

MC

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.

OP

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.

MP

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.

SO

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.

SC

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.

TO

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.

IL

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.

RB

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.

LI

Front-End Developer

Litify

Jul 2019 - Jan 2020 (6 months)

Implemented front-end features and collaborated on UI improvements for the Litify platform.

AT

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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