Tammy Hart

Product Engineer

Senior Frontend Engineer with 15+ years of experience leading teams to build scalable, resilient product architecture

Product-Led Development unifying design and engineering to deliver performant, accessible, and data-driven experiences

Leveraging AI as a force multiplier to offload repetitive tasks, think through complex architecture, and resolve technical gaps

Experience

Five Q (Contract) logo

Five Q (Contract)

Senior Frontend Engineer

09/2025 – 02/2026

Remote

Company Profile

Digital Agency for high-impact non-profitsAnswers in GenesisVoice of the Martyrs

Tech Stack

TypeScriptAstroMabLibreVitestCypress
  • Launched the Humanitas Institute platform, cataloging valuable content and insight to raise awareness for Classical Education and providing a map of Classical schools

  • Established a bespoke design system that enabled wireframe-to-UI direct translation, accelerating delivery cycles and bypassing traditional high-fidelity mockup bottlenecks

  • Achieved perfect 100 Lighthouse scores across Performance, Accessibility, SEO, and Best Practices by leveraging Astro's islands architecture and zero-JS-by-default approach

  • Engineered a robust testing suite using Vitest and Cypress, ensuring 99.9% reliability for mission-critical data visualizations and search functionality

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B-Stock Solutions

Senior Software Engineer

09/2024 – 09/2025

Remote

Company Profile

World’s Largest B2B Recommerce Marketplace$10B+ GMVServing 9 of top 10 US Retailers

Tech Stack

AgileTypeScriptReactNext.jsStorybookTanstack QueryFormikLaunchDarklyJest
  • Engineered a new inventory display system using Next.js to improve frontend performance, significantly reducing page load times and increasing user engagement

  • Spearheaded the frontend of a greenfield feature , allowing buyers to retain search filters and receive email notifications of new search results, resulting in an increase in return buyers

  • Engineered a comprehensive refactor of a data-dependent system, standardizing its architecture to accept multiple data shapes, which removed brittle code and improved system resilience

  • Extended a distributed service architecture , including multiple Next.js applications, NestJS/Node services, and a shared TypeScript UI library

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Planning Center

Software Engineer & Designer

06/2021 – 11/2023

Remote

Company Profile

Privately Held SaaS • 70K+ Orgs4M+ Weekly Active UsersProcessed $29B+ in TPV

Tech Stack

Shape UpFigmaTypeScriptReactRuby on RailsReact QueryJest
  • Led the end-to-end design and implementation of new features for core products, resulting in a more intuitive user experience for over 70,000 organizations

  • Modernized a calendar and facility management product using Figma and TypeScript, including converting views from Ruby to React, improving usability and scalability

  • Enhanced the component system , ensuring UI consistency across core products by opting for decisions over options

  • Drove mobile responsiveness and accessibility enhancements across core user interfaces

  • Engineered an internal dashboard for managing stats for customer service representatives

TrueCar logo

TrueCar

Software Engineer

07/2019 – 06/2021

Remote

Company Profile

Publicly traded (NASDAQ: TRUE)15M+ Monthly Visitors$335M Peak Annual Revenue

Tech Stack

AgileTypeScriptReactRuby on RailsReduxJestCypressLaunchDarkly
  • Engineered a precise lease/loan payment solution , increasing user trust and driving an increase in website conversions

  • Leveraged LaunchDarkly for feature flags and A/B testing to implement and iterate on new feature designs, resulting in a major increase in user engagement and conversion rates

  • Optimized a large-scale React monorepo that serves millions of monthly visitors

  • Elevated and enforced a company-wide design system , ensuring design consistency and quality

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Pedago

Software Engineer & Designer

05/2017 – 07/2019

Remote

Company Profile

Highly Selective Business School11% Acceptance Rate30K+ Annual Applicants

Tech Stack

SketchAngularRuby on Rails
  • Designed and implemented UI/UX for new features that increased user engagement and streamlined the learning experience for thousands of MBA students

  • Led the team in the development of a greenfield feature from concept to launch which allowed hiring managers to post job openings and directly connect with students on our platform

  • Mastered Angular from zero knowledge , contributing independently to key features within three weeks

Tammy is a very strategic and creative problem solver. She is also a team player that looks for ways to help the team succeed in reaching their goals.

She is humble and confident in her ideas to make things better. It was an honor and delight to work with Tammy, and I would look forward to an opportunity to work with her again.

Dave H.

Planning Center Peer

You can depend on Tammy to think critically about her work — she's not only checking the boxes, but delivering a quality experience both visually and functionally for end users.

Thomas B.

TrueCar Manager

I thoroughly enjoyed working with Tammy — both alongside her as a developer responsible for a project, and as a manager responsible for her output. I would be proud to represent her work.

Adrian G.

UpTrending Manager

Notable Projects

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Rhyme

Founder & Sole Product Engineer

02/2026 – Present

rhyme.money

Company Profile

Full-Stack Financial SaaSEnd-to-End OwnershipArchitectureDesignData EngineeringDevOps

Tech Stack

FigmaTypeScriptReactNext.jsLinariaSupabasePlaidResendPostHogVercel
  • Architected a performance-optimized financial platform focused on a "free-to-spend" methodology, leveraging Next.js and Linaria to deliver a zero-latency, refined user experience

  • Engineered a relational schema in Supabase , leveraging Postgres Triggers to automate the real-time shifting of financial obligations across dynamic, user-defined planning horizons

  • Formulated the technical specification for a resilient Plaid integration , designing a "Decimal Integrity" model to enable predictive cash-flow modeling

  • Prototyped a rigorous Design System , bridging the gap between complex financial engineering and high-fidelity UX through a dark-mode first, performance-optimized dashboard architecture

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Heir of Dragons

Sole Product Engineer

08/2024 – Present

staging.heirofdragons.com

Company Profile

Entertainment Meta-PlatformZero-to-One Technical OwnershipCMS & Auth Infrastructure

Tech Stack

FigmaTypeScriptReactNext.jsStrapiMeilisearchGoogle|Discord AuthVercelRailway
  • Partnered with a film production lead , to architect a zero-to-one promotional platform including full-stack development using Strapi for the CMS/API, and Next.js for the frontend

  • Created high-fidelity designs in Figma with components, variables, and prototypes, ensuring a consistent visual and functional experience

  • Engineered a scalable and accessible front-end architecture , implementing custom interactions and transitions while ensuring mobile responsiveness, touch-friendliness, and keyboard navigability

  • Developed common community features from scratch , such as authentication, forum topics/replies, member profiles, bookmarking, and other content submissions that require a user profile