Sr. Software Engineer (Fullstack)
Company: Triumph Labs
Job Description
Sr. Software Engineer (Fullstack)
Role details
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
About this role
Hear the hiring manager explain what the mobile role involves
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.
What You’ll Do
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.
Requirements
Role Requirements
Dealbreaker
Work experience
Must have: Shipped a 0→1 consumer web product at a startup (not pure Big Tech)
Baseline
Seniority
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
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
Ideal companies & backgrounds
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.
1. Consumer Gaming & Entertainment Platforms
High-quality mobile/web experiences
FanDuel
Scopely
Jam City
Niantic, Inc.
Discord
Riot Games
Twitch
Epic Games
2. High-Craft Consumer Fintech & Marketplace Companies
Companies with complex purchase flows — explicitly mentioned by the hiring manager
Stripe
Brex
Tinder
DoorDash
Ramp
Airbnb
Lyft
Uber
Instacart
3. High-Growth Consumer Tech Startups
Known for craft and polished UX
Figma
Notion
Superhuman
Loomis, Sayles & Company
Retool
Vercel
Replit
PitchBook
Linear Technology
Non-Ideal Companies
Triumph Labs would like you to avoid sourcing candidates from these companies.
1. Pure Big Tech Companies
Engineers may lack 0→1 startup or consumer product ownership experience — explicitly flagged as a dealbreaker
Google
Amazon
IBM
Apple
Microsoft
Meta
2. Healthcare Tech Companies
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
3. B2B Enterprise Software Companies
UI craft and consumer experience are not prioritized — explicitly flagged by the hiring manager
Sprinklr
Zendesk
Salesforce
Workday
ServiceNow
SAP
Oracle
Veeva Systems
Coupa
Job Overview
Location
San Francisco, CA
Job Type
Full-time
Salary Range
$200K - $400K