Daniel Joffe

Full-Stack Engineer

• Self-initiated a performance overhaul that cut mobile First Contentful Paint from ~10s to ~2s and raised Lighthouse scores by 40+ points across all pages.
• Reduced bundle size by ~62% (650–800 KB down to 250–300 KB) and cut mobile bounce rate by ~39%.
• Architected a lazy-load video component that prevented 500–800 MB of per-page downloads; adopted as the team's default pattern.
• Recognized the same marketing-blocked-on-engineering pattern from Winc and led a Storyblok CMS migration that cut engineering involvement in marketing deployments by ~80%.
• Built A/B testing infrastructure on Google Optimize across copy, video, image, and offer variants; ran quarterly experiments on 2-week test cycles.
• Mentored a junior developer through pair programming and code review; promoted to Front-End Developer within one year.

Software Engineer

• Sole frontend engineer for ~23 months on a platform serving 5,500+ library clients and thousands of catalogers.
• Resolved 200+ WCAG accessibility violations and set the accessibility-first standard for the platform.
• Led a year-long serials cataloging project, more than doubling features and cutting backlog by a quarter.

Frontend Developer

• Built a centralized React component library adopted by ~80% of company applications, growing from 12 to 30+ documented components.
• Trained 7 developers on library contribution patterns; mentored 4 junior engineers (one advanced to NASA's Jet Propulsion Laboratory, one to Senior Engineer).
• Sole hiring lead after the senior departed; interviewed 13 candidates and rebuilt the team.
• Re-architected a desktop-only patient messaging app for mobile-first in under a month, partnering with design on UX and brand alignment.
• Took over a stalled doctor-to-doctor communication platform and led a team of 6 to ship it in ~1 month.

Frontend Developer

• Proposed and built a self-serve landing-page CMS as an unsolicited side project; demoed to the VP and shipped it to 4 marketing users — 200+ campaign pages in 2 months versus the prior 4+ week minimum.
• Eliminated 12+ engineering hours/week; the marketing team averaged 8–12 pages/week operating independently.
• Led the ClubW → Winc rebrand at the CEO's request; restyled the entire application in ~1 month.

Job application pipeline

Python/FastAPI microservice on Railway that polls Greenhouse boards asynchronously, scores postings via weighted keyword matching, and persists to Supabase (row-level security, dedup on greenhouse_id). Next.js admin dashboard behind JWT-cookie auth; Vercel cron automation. Security hardening throughout: timing-safe credential comparisons, Pydantic Literal/regex validation, TrustedHostMiddleware. 901 Node + 54 Python tests passing.

shared-ui (ui.danieljoffe.com)

A reusable React + TypeScript + Tailwind component library that powers every surface of danieljoffe.com; documented in Storybook and published as its own deployable npm package.

danieljoffe.com

Portfolio built as a modern-practice showcase: Nx monorepo, pre-commit hooks enforcing ESLint/Prettier/Jest/Playwright/Lighthouse, GSAP animations, Vercel + GitHub Actions CI/CD.

Logistics Dashboard (contract, 2023)

Next.js + TypeScript with AWS Cognito role-based auth; shipped the MVP for a seed-stage venture.