Tammy Hart

Software EngineerFrontend/UX

Senior Product Engineer with 15+ experience designing, architecting, and launching end-to-end software ecosystems

Proven track record of combining deep frontend architecture with full-stack capability, technical governance, and data modeling

Systemic translation of complex product strategies into performant, accessible component libraries and living applications

Core Competencies

  • Design Systems

    Figma

    Interaction Design

    User Flows

    Advanced Prototyping

  • Frontend Architecture & UI

    TypeScript

    React

    Next.js

    Linaria

    Design Tokens

  • Full-Stack & Content

    Payload CMS

    Supabase

    Data Modeling

    Serverless Infrastructure

  • Product Standards & Quality

    WCAG-accessibility

    Product-Led Development

    Automated Testing

Experience

Grammar Style logo

Grammar Style

Founder & Lead Engineer

3/2026 – Present

grammar.style

Company Profile

Open SourceDesign System InfrastructureGovernance-First EngineDeveloper Tooling

Tech Stack

TypeScriptNPMGitHubJitiCSS/PostCSSVitest
  • Enforces strict CSS variable distribution and architectural consistency with a governance-first design token engine

  • Eliminates design-to-code drift and configuration typos through a recursive type-safety layer for semantic tokens

  • Enables instant IDE intellisense and real-time validation via a zero-latency configuration loader built with Jiti

  • Establishing architectural standards and managing the NPM release lifecycle for a FOSS design system framework

Rhyme logo

Rhyme

Founder & Sole Product Engineer

2/2026 – Present

rhyme.money

Company Profile

Full-Stack Financial SaaSEnd-to-End OwnershipArchitectureDesignData EngineeringDevOps

Tech Stack

FigmaTypeScriptReactNext.jsLinariaSupabasePlaidResendPostHogVercel
  • Engineering a highly responsive user experience in a performance-optimized Next.js and Linaria financial platform

  • Automating dynamic financial planning by building a relational Supabase schema with Postgres triggers

  • Facilitating reconciliation between actual and planned spending by designing a robust Plaid integration architecture

  • Optimizing dashboard performance and high-fidelity UX by developing a data-mode first Design System

B-Stock Solutions logo

B-Stock Solutions

Senior Software Engineer

9/2024 – 9/2025

Remote

Company Profile

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

Tech Stack

AgileTypeScriptReactNext.jsStorybookTanstack QueryFormikLaunchDarklyJest
  • Engineered a Next.js inventory display system, reducing Time to Interactive and accelerating user content discovery

  • Increased return buyer rates by spearheading a greenfield saved search and notification feature

  • Improved system resilience, refactoring architecture for flexible data shapes and removing brittle code

  • Scaled a distributed service architecture by extending several Next.js apps, NestJS services, and UI library

Heir of Dragons logo

Heir of Dragons

Product Architect & Sole Engineer

8/2024 – Present

staging.heirofdragons.com

Company Profile

Entertainment Meta-PlatformEnd-to-End OwnershipContent StrategyUI/UXFull-Stack

Tech Stack

FigmaTypeScriptReactNext.jsPayload CMSMeilisearchGoogle AuthDiscord AuthRailway
  • Invented a promotional platform for a film production lead, with a full-stack Payload and Next.js architecture

  • Ensured a consistent visual and functional experience by creating high-fidelity Figma components and prototypes

  • Optimized accessibility and mobile responsiveness with custom interactions, and ensured keyboard navigability

  • Enabled community engagement with fully custom forums, member profiles, bookmarking, notifications, and more

Planning Center logo

Planning Center

Software Engineer & Designer

6/2021 – 11/2023

Remote

Company Profile

Privately Held SaaS70K+ Orgs4M+ Weekly Active UsersProcessed $29B+ in TPV

Tech Stack

Shape UpFigmaTypeScriptReactRuby on RailsReact QueryJest
  • Improved intuitive UX for 70,000+ organizations by leading end-to-end feature design and implementation

  • Improved scalability of a calendar and facility management product by migrating Ruby views to React

  • Ensured cross-product UI consistency, scaling the component system in a decisions-over-options philosophy

  • Drove mobile responsiveness and accessibility enhancements across core user interfaces

  • Streamlined representative performance tracking by engineering an internal stats dashboard

TrueCar logo

TrueCar

Software Engineer

7/2019 – 6/2021

Remote

Company Profile

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

Tech Stack

AgileTypeScriptReactRuby on RailsReduxJestCypressLaunchDarkly
  • Increased website conversions and user trust by engineering a precise lease/loan payment solution

  • Boosted engagement and conversion rates through LaunchDarkly feature flags and A/B testing

  • Optimized performance for millions of monthly visitors by managing a large-scale React monorepo

Pedago logo

Pedago

Software Engineer & Designer

5/2017 – 7/2019

Remote

Company Profile

Highly Selective Business School11% Acceptance Rate30K+ Annual Applicants

Tech Stack

SketchAngularRuby on RailsFull Visual Regression Testing
  • Increased engagement and streamlined learning for MBA students via new UI/UX features

  • Enabled recruiter-student connections by leading the greenfield development of a job-posting 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 Harris

Planning Center Peer

Few engineers bridge the gap between technical excellence and design intuition the way Tammy does. What truly sets her apart is her eye for design—with Tammy, you get both an engineer and a designer in one person. Over the years working together, Tammy proved to be an integral part of our team’s success. She takes ownership from start to finish, communicates clearly, and continually leans into her design strengths to make herself invaluable.

Thomas Breese

TrueCar Engineering Manager

Tammy designed a client website with world class design that met and exceeded the client expectations. Tammy also had an opportunity to showcase her ability to mentor and coach a more junior engineer—something that she is great at. Thanks for your fantastic work!

Anthony Elliot

Technology Team Manager