Available for new projects

David
Gaitsgory

Freelance full-stack engineer. SaaS platforms, data dashboards, mobile apps, browser extensions, and everything in between.

See my work Get in touch →
What I build
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Full-Stack Development

End-to-end web applications — UI, APIs, databases, auth flows, payments.

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Data Visualisation

Custom interactive charts and analytics dashboards.

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Mobile Apps

Cross-platform mobile applications with a native feel.

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Automation & Tooling

Data pipelines, browser extensions, report automation.

Selected work
01
SaaS Marketplace React Node.js

Styleep

Production B2B marketplace connecting freelance beauty professionals with salons — scheduling, contracts, Stripe payments, and gamification.

↗ 02
Marketplace Next.js Stripe Connect Zoom API

Upward Facing Cat

B2C dance class marketplace with automated Zoom meeting creation, Stripe Connect multi-party payments, and E2E test coverage.

↗ 03
AI Chrome Extension TypeScript GraphQL

Buster.ai

Chrome extension detecting misinformation and deepfakes on Twitter in real time — AI verdicts, confidence scores, and heatmaps injected inline.

↗ 04
Healthcare D3.js React UCSF

Health Gorilla

Healthcare data visualisation dashboard for UCSF providers — three custom D3 chart types, longitudinal patient data, and a Florence Nightingale polar chart.

↗ 05
Analytics React TypeScript PostgreSQL

[Confidential]

Device telemetry intelligence platform with a composable multi-column filter builder, virtualized data tables, and saved query presets.

↗ 06
SaaS D3.js React PostgreSQL

Town & Country

Revenue management SaaS for hotel pricing — custom D3 time-series charts, competitor rate tracking, calendar and table views, and pricing rules.

↗ 07
Mobile React Native TypeScript Expo

Wisight

React Native compliance app enabling anonymous workplace violation reporting — multi-step flows, dark mode, and a custom component library.

↗ 08
Automation Python Node.js AWS

Pioneer Buzz

Automated pipeline on AWS generating pixel-perfect branded multi-page PDF report cards weekly from Excel brand performance data.

↗ 09
Data Journalism Python Pandas Published

Public Health Post

Published data investigation for Boston University analysing 33 years of U.S. drinking water violations across 600k+ rows of federal data.

↗ 10
D3.js Data Viz Academic

Memetic Influence

Interactive visualisation for a UT Austin thesis on IRA propaganda — D3 meme propagation networks, 10 bar charts, and custom SVG graph layouts.

↗ 11
Research Unity C Formal Verification

ARTiMon

Biosensor runtime monitoring demo for CEA LIST — formal temporal logic specs, a C socket bridge on Raspberry Pi, and real-time Unity biosensor simulation.

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Let's work together

Have a project in mind?

I take on a limited number of freelance engagements at a time. If you're building something bold, I'd love to hear about it.

Get in touch