Senior Fullstack Software Engineer (React, TypeScript)
Seeking a Senior Fullstack Software Engineer to build and own the web platform for a fast-growing mobile app. Responsibilities include establishing web infrastructure, developing a web version of a collectibles trading card app, and owning internal tools. Requires 5+ years of fullstack experience with a focus on React and TypeScript, and experience shipping 0→1 consumer web products at a startup.
Key Highlights
Key Responsibilities
Technical Skills Required
Benefits & Perks
Nice to Have
Job Description
AI Talent Hunt Looking for their Client:
Salary: $200K - $400K
On-site work policy: In-office 5 days/week in San Francisco, CA
Full-time position
Location: San Francisco, CA
Tech stack: React, TypeScript, JavaScript
Equity: Competitive equity
Visa sponsorship details: Open to visa transfers (e.g. OPT, H1B transfers)
Additional visa sponsorship details: Open to transfers
Hear the hiring manager explain what the mobile role involves24:45
As a Fullstack Software Engineer on the web team, you’ll drive revenue and company growth by bringing one of the fastest-growing mobile apps to the web. By owning the end‑to‑end web stack and our internal tools and dashboard, you’ll build our web infrastructure and create new opportunities for business growth. You’ll deliver a web version of Rips, our collectibles trading card app, and set the foundation for future web and Android. By setting the standards for this new platform, you’ll push the boundaries of what it means to be one of the fastest growing app in our category.
- Establish our web platform, setting the foundation and standards for how we build future web and Android apps.
- Utilize existing backend systems and infrastructure to create Rips for web in 3-6 months.
- Define our team’s best practices and standards for React (potential to work on React Native as well).
- Own all internal tools and our internal dashboard, making improvements that help the team be efficient and better use data to drive decision-making.
- Partner with backend engineers to design APIs and data models, contributing to API designs and app performance.
- Elevate UX with thoughtful motion, micro-interactions, and responsive design that feels native.
Work experience
Must have: Shipped a 0→1 consumer web product at a startup (not pure Big Tech)
BaselineSeniority
Required: 5+ years of experience in fullstack web engineering, with focus on React and TypeScript
Work experience
Required: Owned frontend platform/standards for a consumer-facing web app
Hard skills
Required: Deep expertise in React and TypeScript (modern patterns, hooks, performance)
Required: Built polished UI with motion/animations and pixel-perfect Figma implementation
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Miscellaneous
Required: Demonstrated ability to self-prioritize and ship fast in ambiguous, high-agency environments
Nice-to-have
Work experience
Nice to have: Experience in real-time features, payments, or consumer gaming apps
Education
Nice to have: No specific degree required
Hard skills
Nice to have: Experience partnering with backend engineers on API design and data models
Traits to avoid
Avoid: Pure Big Tech engineers with no startup or 0→1 product experience
Avoid: Candidates who need heavy design/UX handholding — must have strong product sense
- Are you able to work in San Francisco and come into the office 5 times per week?
- Walk us through a 0→1 consumer web product you shipped and how long it took you to get it live.
- What's your experience with React and TypeScript and how have you used them to build polished consumer-facing UIs?
- Can the candidate be on-site? If not, is the candidate willing to relocate?
- What is their salary expectation?
- How actively is this candidate exploring new opportunities?
Hear the hiring manager describe the ideal mobile engineer34:00
Here are a list of companies Triumph Labs likes to see candidates with past work experience from. You can also use these companies and adjacent companies as a place to start sourcing candidates.
Consumer gaming and entertainment platforms with high-quality mobile/web experiences.
High-quality mobile/web experiences
- FanDuel
- Scopely
- Jam City
- Niantic, Inc.
- Discord
- Riot Games
- Twitch
- Epic Games
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Companies with complex purchase flows — explicitly mentioned by the hiring manager
- Stripe
- Brex
- Tinder
- DoorDash
- Ramp
- Airbnb
- Lyft
- Uber
- Instacart
Known for craft and polished UX
- Figma
- Notion
- Superhuman
- Loomis, Sayles & Company
- Retool
- Vercel
- Replit
- PitchBook
- Linear Technology
Triumph Labs would like you to avoid sourcing candidates from these companies.
1. Pure Big Tech CompaniesEngineers may lack 0→1 startup or consumer product ownership experience — explicitly flagged as a dealbreaker
- Amazon
- IBM
- Apple
- Microsoft
- Meta
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B2B-focused products and lower consumer quality bar — flagged by the hiring manager during profile review
- Health Catalyst
- athenahealth
- Doximity
- Cotiviti
- EPIC Systems
- Cerner Corporation
UI craft and consumer experience are not prioritized — explicitly flagged by the hiring manager
- Sprinklr
- Zendesk
- Salesforce
- Workday
- ServiceNow
- SAP
- Oracle
- Veeva Systems
- Coupa
Location
San Francisco, CA
Job Type
Full-time
Salary Range
$200K - $400K
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