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Mobile App Engineer

Sirius LyncApplies on LinkedInEngineering & Development
Salary
$185K–$300K
Moves you to
United States
Support
Visa sponsorship
Posted
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We're hiring: Founding Mobile App Engineer (iOS) @ Fullstack

Full-time | On-site 5 days/week - NYC | $185K - $300K Base + Strong Equity + Cash Bonuses

We are building the only front-end trading app you'll ever need.

Retail crypto trading today is broken - fragmented across venues, wallets, and browser extensions. We're fixing it. One unified portfolio margin trading experience for everything - Perps, Crosschain Spot, Prediction Markets. Post any collateral, trade on any venue including Hyperliquid, without selling down collateral.

We're a 13-person team, $15M+ funded, based in NYC. Our founders built Insilico Terminal - the #1 OEMS for centralized exchanges doing $900B+ in volume and 90%+ market share.

Now we're building our first mobile app from scratch, and we need you to own it.

What you'll do:

Build Fullstack's first mobile trading app from 0 to 1 - full trading experience with live market data, complex order types, multi-venue tradingOwn the entire mobile architecture. Set the foundation future engineers will build on. Nothing can break, go down, or get a decimal wrong.Build gesture-driven UI + fast, interactive charts that bring a pro trading terminal to a small screenConnect to REST & WebSocket streams, handle reconnections, live price feeds, and cached state so the app stays responsive when markets get volatileBuild native wallet integrations, biometric auth, transaction signing & secure key storageLead the full App Store release lifecycle + CI/CD for builds, previews, testing, rollbacksWork directly with founders and front-end team to bring web trading experience to mobile with consistent design

What we're looking for:

  • 3-16 years as an iOS Engineer building apps in Swift
  • You’ve taken an app from zero to one and through App Store release
  • Comfortable owning a codebase a whole team will build on
  • You write solid code with or without AI tools
  • Real, active interest in trading - you trade yourself or build trading side projects
  • Bonus: Experience with real-time data, fintech, or crypto apps (Robinhood, crypto-native apps)
  • Bonus: Public portfolio / GitHub of iOS work

Tech Stack: Swift, iOS

Role details:

Salary: $185K - $300K + equity + bonuses

Location: New York City Metro Area - On-site 5 days/week in NYC

Employment: Full-time

Equity: Included

Visa: Open to visa transfers (OPT, H1B transfers with >= 3 years remaining, O1, TN). H1B lottery NOT included.

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