Tammy Hart

Software EngineerFrontend/UX

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

9/2025 – 2/2026

Remote

Company Profile

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

Tech Stack

TypeScriptAstroMabLibreVitestCypress
  • Increased awareness for Classical Education by launching the Humanitas Institute platform

  • Accelerated delivery cycles by establishing a bespoke design system for direct wireframe-to-UI translation

  • Achieved near perfect 100 Lighthouse scores across all categories using Astro’s zero-JS architecture

  • Ensured 99.9% reliability for mission-critical platform features via a robust Vitest and Cypress testing suite

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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
  • Reduced page load times and increased engagement by engineering a Next.js inventory display system

  • 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

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Planning Center

Software Engineer & Designer

6/2021 – 11/2023

Remote

Company Profile

Privately Held SaaS • 70K+ 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

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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

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Pedago

Software Engineer & Designer

5/2017 – 7/2019

Remote

Company Profile

Highly Selective Business School11% Acceptance Rate30K+ Annual Applicants

Tech Stack

SketchAngularRuby on Rails
  • 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 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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Grammar Style

Founder & Lead Engineer

3/2026 – Present

grammar.style

Project Profile

Open SourceDesign System InfrastructureGovernance-First EngineDeveloper Tooling

Tech Stack

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

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

  • Enabled instant IDE intellisense and real-time validation by developing a zero-latency configuration loader using Jiti

  • Established architectural standards and managed the NPM release lifecycle for a FOSS design system framework

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Rhyme

Founder & Sole Product Engineer

2/2026 – Present

rhyme.money

Project Profile

Full-Stack Financial SaaSEnd-to-End OwnershipArchitectureDesignData EngineeringDevOps

Tech Stack

FigmaTypeScriptReactNext.jsLinariaSupabasePlaidResendPostHogVercel
  • Delivered a zero-latency, refined user experience in a performance-optimized Next.js and Linaria financial platform

  • Automated dynamic financial planning by building a relational Supabase schema with Postgres Triggers

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

  • Optimized dashboard performance and high-fidelity UX by developing a dark-mode first Design System

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Heir of Dragons

Sole Product Engineer

8/2024 – Present

staging.heirofdragons.com

Project Profile

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

Tech Stack

FigmaTypeScriptReactNext.jsStrapiMeilisearchGoogle|Discord AuthVercelRailway
  • Delivered a zero-to-one promotional platform for film production lead, with a full-stack Strapi 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 ensuring keyboard navigability

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