Software Engineer (Full-Stack, Mobile-Leaning)

SPEEDLABS, LLC
Union City, United States of America
yesterday

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English, Polish
Experience level
Junior

Job location

Union City, United States of America

Tech stack

JavaScript
API
Artificial Intelligence
Cursor (Graphical User Interface Elements)
Mobile Application Software
Python
PostgreSQL
TypeScript
WebSocket
Real Time Systems
React
Firebase
Backend
GIT
FastAPI
WebPack
Sentry
Figma
React Native
Data Pipelines

Job description

About usWe build Speed Survivor, a real-time, real-money sports-prediction game. Players join contests tied to live games, answer fast yes/no props, and get scored on speed and accuracy until one survivor takes the prize. It's a small team shipping fast across a mobile app, a couple of Python services, an admin panel, and a payments site. You'll touch a lot of the stack and see your work in users' hands within days.What you'll do

  • Build and ship features in our React Native + Expo mobile app (TypeScript): screens, navigation, onboarding flows, in-game UI, and social features.
  • Fix bugs and triage crashes from Sentry. Reproduce, find the root cause, and ship the fix.
  • Make small-to-medium backend changes in our Python/FastAPI services backed by PostgreSQL.
  • Help maintain our internal React/Vite admin panel with contest setup, test tooling, data pipelines, etc.
  • Turn Figma designs into clean, consistent UI and polish rough edges (spacing, transitions, empty/error states).
  • Help with day-to-day release work: running iOS/Android builds, chasing down native build issues, and getting changes deployed.

Requirements

  • ?0-2 years, or strong bootcamp/self-taught with a portfolio
  • Strong AI dev skills. Use Cursor or Claude Code effectively but still able to talk through and explain your code. Being able to use it as a tool but not over-reliant.
  • Solid JavaScript/TypeScript fundamentals and some hands-on React Native
  • Comfortable reading code you didn't write and tracing a bug across the front end and an API.
  • Basic Git workflow and the ability to work independently from a written task.
  • High ownership and scrappy, but not afraid to ask questions.
  • Cares about the user-facing result, not just "the ticket is closed."

Nice to have (not required)

  • Any Python (FastAPI a bonus) and basic SQL / PostgreSQL.
  • Familiarity with Firebase Auth, Sentry, or mobile app store submission.
  • Exposure to real-time systems (WebSockets/SSE), or any sports/gaming/fintech product.

Benefits & conditions

  • Small team, direct access to the founder, fast feedback loops.
  • High ownership over deliverables with easy access to support and mentorship
  • You'll be supported with clear tasks and code review, with room to grow into owning whole features.

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