Sr. Full-Stack Software Engineer

Invisible Technologies
Washington, District of Columbia, United StatesContractPosted Sep 16, 2026

About the role

Full-Stack Software Engineer

Pay: $50–$100/hour

Location: Global, fully remote

Job Type: Contractor (~15 hours per week)

Schedule: Flexible—you choose the hours and days you work, including weekends if desired

Posted by micro1

300 openings

Required Skills

Python

React

Javascript

Java

Node.js

Rust

Golang

Typescript

Job Description

We are looking for highly skilled Full-Stack Software Engineers to contribute to an AI training project involving software development, technical problem-solving, debugging, system architecture, and code evaluation.

The work involves creating, solving, reviewing, and validating challenging software-engineering tasks across front-end and back-end systems and helping with translating full coding builds from one particular language into another.

This role requires meaningful hands-on experience across both front-end and back-end engineering. Candidates should be comfortable working throughout the application stack rather than specializing exclusively in one layer.

What You’ll Work On

Develop, modify, and debug front-end and back-end application components.

Implement user-facing features and the services, APIs, and data models that support them.

Trace requests and data across browsers, front-end applications, APIs, services, databases, and external integrations.

Work inside unfamiliar repositories and understand existing application architecture.

Diagnose failures involving application state, API contracts, authentication, persistence, networking, and deployment.

Evaluate and improve code written in multiple programming languages.

Review AI-generated solutions for correctness, completeness, performance, security, and maintainability.

Required Qualifications

Strong professional experience developing production full-stack applications.

Meaningful hands-on experience with both front-end and back-end engineering.

Production experience with multiple programming languages.

Strong knowledge of browser applications, APIs, application state, databases, and service integration.

Experience understanding and contributing to the architecture of complete software systems.

Ability to work effectively in unfamiliar codebases.

Strong debugging and technical problem-solving skills.

Process

Apply to the role and complete the screening questions.

Complete an AI interview of approximately 30 minutes.

Complete a technical assessment, if required.

Complete the hiring manager review.

Compensation Structure

Compensation is output-based. Experts are paid per task that meets the project specifications. The time required to complete each task may vary depending on the expert’s experience and workflow.

Minimum submission requirements apply. Experts must submit a minimum number of tasks per week.

Start Timeline & Availability

We typically fill roles within 48 hours and are looking for experts who are ready to begin immediately. If selected, you will be expected to start your first tasks within 24–48 hours of completing onboarding.

Responsibilities

  • Develop, modify, and debug front-end and back-end application components
  • Implement user-facing features and the services, APIs, and data models that support them
  • Trace requests and data across browsers, front-end applications, APIs, services, databases, and external integrations
  • Work inside unfamiliar repositories and understand existing application architecture
  • Diagnose failures involving application state, API contracts, authentication, persistence, networking, and deployment
  • Evaluate and improve code written in multiple programming languages
  • Review AI-generated solutions for correctness, completeness, performance, security, and maintainability

Qualifications

  • Strong professional experience developing production full-stack applications
  • Meaningful hands-on experience with both front-end and back-end engineering
  • Production experience with multiple programming languages
  • Strong knowledge of browser applications, APIs, application state, databases, and service integration
  • Experience understanding and contributing to the architecture of complete software systems
  • Ability to work effectively in unfamiliar codebases
  • Strong debugging and technical problem-solving skills

Skills mentioned

PythonReactJavaScriptJavaNode.jsRustGoTypeScriptFrontend DevelopmentBackend Development

About Invisible Technologies

Invisible Technologies makes AI work. Our platform cleans, labels, and structures company data so it’s ready for AI. It adapts models to each business and adds human expertise when needed — the same approach used to improve models for over 80% of the world’s top AI companies, including Microsoft, AWS, and Cohere. Our successes span industries — from supply chain automation for Swiss Gear, to AI-enabled naval simulations with SAIC, and validating NBA draft picks for the Charlotte Hornets. Invisible, profitable for over half a decade, reached $134m in revenue and ranked #2 fastest-growing AI company in 2024, and recently raised $100M to advance its platform technology.

Software Development201-500 employeesNew York, NY

H-1B sponsorship history

Historical employer filing data was found for Invisible Technologies. The employer record includes 10 historical certified applications. This is employer-level history, not a guarantee that this role currently offers sponsorship.