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.

Consumer Gaming & Entertainment Platforms

High-quality mobile/web experiences

FanDuel

Scopely

Jam City

Niantic, Inc.

Discord

Riot Games

Twitch

Epic Games

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

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.

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

Senior Trainer (Triumph Lab) Sr. Software Engineer (Fullstack)

Visa & sponsorship

Job description