Software Developer to build testing software

Posted 6 hours ago

Worldwide

Summary

Software Developer with experience in TypeScript/JavaScript on Node.js and more. The crux of this build is web3 / stablecoin engineering with embedded wallets. Whoever builds it needs hands-on experience issuing ERC-20 transfers (USDC) on an L2 (Base) — funding a treasury wallet, computing gas, handling on-chain transaction confirmation and failure/retry, and doing all of it server-side so the consumer never touches a seed phrase. Paired with that is real integration experience with a managed embedded-wallet provider (Privy or Coinbase Embedded Wallets specifically) — programmatic wallet creation on first reward, email-OTP auth, and server-initiated transfers.

  • Less than 30 hrs/week
    Hourly
  • 1-3 months
    Duration
  • Expert
    Experience Level
  • Remote Job
  • Ongoing project
    Project Type
Skills and Expertise
Mandatory skills
Python
Web3
TypeScript/JavaScript on Node.js
Activity on this job
  • Proposals:20 to 50
  • Last viewed by client:31 minutes ago
  • Interviewing:
    12
  • Invites sent:
    20
  • Unanswered invites:
    8
About the client
Member since Jul 24, 2026
  • United States
    6:16 PM

Explore similar jobs on Upwork

Multiplayer Card gameHourly‐ Posted 2 weeks ago
Native App Development
AngularJS
TypeScript
Node.js
JavaScript
React
MongoDB
MySQL
Amazon Web Services
Redis
Socket.io
Web Design
ExpressJS
NodeJS Framework
Game Development
RESTful API
Python
Database Development
Microsoft Excel
Data Processing
CRM Development

How it works

  • Post a job icon
    Create your free profile
    Highlight your skills and experience, show your portfolio, and set your ideal pay rate.
  • Talent comes to you icon
    Work the way you want
    Apply for jobs, create easy-to-by projects, or access exclusive opportunities that come to you.
  • Payment simplified icon
    Get paid securely
    From contract to payment, we help you work safely and get paid securely.
Want to get started? Create a profile

About Upwork

  • Rating is 4.9 out of 5.
    4.9/5
    (Average rating of clients by professionals)
  • G2 2021
    #1 freelance platform
  • 49,000+
    Signed contract every week
  • $2.3B
    Freelancers earned on Upwork in 2020

Find the best freelance jobs

Growing your career is as easy as creating a free profile and finding work like this that fits your skills.

Trusted by

  • Microsoft Logo
  • Airbnb Logo
  • Bissell Logo
  • GoDaddy Logo