Full-Stack Engineer (Contract) — Build Crypto Platforms

CoinFlip Preferred LLC; Chicago (IL); On-site; USD 45,000 - 55,000; Full time

Job summary

CoinFlip Preferred LLC is seeking a skilled Full-Stack Software Engineer to join our engineering team. You will work across backend services and frontend applications that support onboarding, transaction management, compliance workflows, and internal operational tools across CoinFlip’s product ecosystem.

You’ll collaborate with product managers, designers, engineers, and operations to deliver reliable, end-to-end solutions backed by scalable backend systems and intuitive user experiences.

Qualifications

• 3+ years of experience working across frontend and backend systems.
• Strong backend experience with Golang and/or Java.
• Proficiency with Node.js / TypeScript v5 (Wallet).
• Experience building frontend apps with Next.js, React, and TypeScript.
• Solid RESTful API design and PostgreSQL skills.
• Experience in AWS cloud environments and Kubernetes.
• Familiarity with Terraform and Helm.
• CI/CD and Git-based workflows.
• Clear communication and collaborative mindset.

Responsibilities

• Design, build, and maintain full-stack features across frontend and backend.
• Develop and maintain backend APIs supporting onboarding, authentication, and transactions.
• Enhance frontend experiences in customer-facing and internal apps.
• Integrate systems with third-party services and providers.
• Implement secure authentication and authorization using OAuth 2.0.
• Operate in a microservices environment delivering scalable backend capabilities.
• Ensure security, performance, reliability, and observability.
• Participate in code reviews and architectural decisions.
• Write and maintain technical documentation.

Skills

Golang

Java

Node.js

TypeScript

React

Next.js

REST APIs

PostgreSQL

AWS

Kubernetes

Terraform

CI/CD

Grafana

Tools

Docker

Git

CI/CD pipelines

Job description

CoinFlip Preferred LLC is seeking a skilled Full-Stack Software Engineer to join our engineering team. You will work across backend services and frontend applications that support onboarding, transaction management, compliance workflows, and internal operational tools across CoinFlip’s product ecosystem.

You’ll collaborate with product managers, designers, engineers, and operations to deliver reliable, end-to-end solutions backed by scalable backend systems and intuitive user experiences.