Freelance Software Engineer Jobs: Hourly, Remote, No Bidding

Every open freelance software engineer job from six AI training marketplaces, highest hourly rate first. No proposals to write and no clients to chase. Refreshed daily.

133 open freelance software engineer listings live right now, paying up to $350 an hour.

On this page:Get Paid to Contribute to Open SourceFreelance Python Developer JobsFreelance JavaScript and TypeScript JobsFreelance Rust Developer JobsFreelance C++ and C# Developer JobsFreelance Code Review and QA Jobs
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$25+ / hour$50+ / hour$75+ / hour$100+ / hour

Filtering by rate hides per-task listings, which have no hourly equivalent.

Category
Language & audio261Software engineering156Science & research128Finance & accounting116Medicine & healthcare105Data & machine learning91Business operations71Cybersecurity69Engineering (other)69Law61Arts & design49Robotics37
Experience
Entry level42Mid level311Senior189Lead / principal27
Commitment
Contract / hourly1095Part time79Task based54Full time27
Arrangement
Remote1226Hybrid15On site4
Marketplace
Alignerr553micro1345Mercor315Terac24DataAnnotation19Outlier15
Date posted
Past weekPast monthPast 3 months

Freelancing without the bidding war

These freelance software engineer jobs come from AI labs, not clients. The labs pay engineers by the hour to write, review and test the code their models learn from. Most listings publish an hourly rate before you apply. Nobody asks for a proposal and nobody haggles.

That is the difference from Upwork, where you buy Connects to bid and a study of 44,863 postings found 6 in 10 never hired anyone. Here you apply once, pass a screen, and take tasks as they open.

There is one catch: the screen. Most of these marketplaces interview you with an AI that follows up on every answer, then grade a short sample of the real work. Strong engineers fail it by coding in silence. It scores how you explain a decision, not only whether the code runs.

Freelance developer rates by stack

Published hourly rates for each section on this page, computed from the open listings. A listing counts in more than one row when its title names several.

Stack or specialtyOpen listingsPublished hourly rate
GitHub contributor6$50 to $300
Python7$50 to $90
JavaScript and TypeScript11$20 to $120
Rust11$20 to $120
C++ and C#12$20 to $120
Code review and QA15$40 to $175

Get Paid to Contribute to Open Source

Most open source maintainers work unpaid. These listings pay engineers by the hour to work in public repositories: fix real bugs, build features, and write the tasks and tests that check whether an AI agent can do the same.

The screen reads your public record, so expect to walk through a pull request you shipped and the review it got. One listing spells out the bar: contributions must show real engineering, not only documentation updates, dependency bumps or typo fixes.

6 open GitHub contributor listings right now, published at $50 to $300 an hour.

Freelance Python Developer Jobs

Python is the skill these listings name most often, because coding models are tested on it more than any other language. SWE-bench, the coding-agent benchmark labs quote most, draws every task from Python repositories.

The listings ask for senior backend and full-stack Python: typing, packaging, concurrency and the bugs a test suite misses. You grade a model’s solution, fix it, and write the tests that prove the fix.

7 open Python listings right now, published at $50 to $90 an hour.

Search all Python listings

Freelance JavaScript and TypeScript Jobs

Frontend and Node work, reviewed the way a senior engineer reviews a pull request. You catch the component that renders but breaks on resize, the effect that fires twice and the type that compiles but lies, then write the fix.

Expect React, TypeScript and Node.js in the requirements. Full-stack titles in other languages sit in their own sections.

11 open JavaScript and TypeScript listings right now, published at $20 to $120 an hour.

Search all JavaScript and TypeScript listings

Freelance Rust Developer Jobs

Rust listings sit at the systems end of the market: data infrastructure, distributed systems, ML tooling and high-performance computing. Most titles ask for senior, lead or principal experience.

The tasks match the language. You review a model’s Rust for ownership, concurrency and unsafe-code mistakes, then write the version that passes the borrow checker and the tests.

11 open Rust listings right now, published at $20 to $120 an hour.

Search all Rust listings

Freelance C++ and C# Developer Jobs

C++ listings cluster around performance: HPC, data platforms and internal tooling. C# listings are .NET backend and full-stack work.

Both reward reading code before running it. Models still write C++ that compiles and then leaks, races or allocates in a hot loop. Your job is to spot it and explain why.

12 open C++ and C# listings right now, published at $20 to $120 an hour.

Freelance Code Review and QA Jobs

Code review is the skill AI labs buy most directly. These listings pay you to judge code you did not write: rank two model answers, audit an agent’s trace step by step, or test a feature until it breaks.

Auditor roles check other contributors’ tasks against a benchmark’s rules, SWE-bench among them. Pairwise and ranking roles compare two solutions and explain which one should merge. It is the closest match to a senior engineer’s day, without the meetings.

15 open code review and QA listings right now, published at $40 to $175 an hour.

What the work looks like

A task is a prompt, a model’s answer and a rubric. You run the code, find what is wrong, explain each problem, and often write the version that should have shipped. The better-paid tasks ask you to build the test itself: a small repository, a planted bug and a suite that proves whether an agent fixed it.

You choose when to work. Most listings are hourly contracts with no meetings, so tasks fit around a day job or a gap between clients. Some pay for hours logged and some for accepted tasks. The listing says which, so read it before you start.

Further reading

Where these listings come from

Six marketplaces publish this work openly. Every listing above links to the one that posted it, and each has its own page here covering pay, screening and who gets hired.

MercorOutlierDataAnnotationAlignerrmicro1Terac

Freelance software engineer AI training jobs, answered

Are these real freelance software engineer jobs?

Yes. You join the marketplace as an independent contractor, and most listings publish an hourly rate up front. There is no client to find, no scope to negotiate and no invoice to chase. The marketplace matches you to projects after you pass its screen.

What is the catch?

The screen. An AI interview or coding assessment scores how you explain decisions, not only whether the code runs, and engineers who think in silence fail it. Plan around volume too: projects open and close in waves, so hours are not guaranteed.

How is this different from Upwork or Toptal?

On Upwork you bid for each project with paid Connects and pay a service fee of 0% to 15%. Toptal screens you, then matches you with clients you still have to win. Here most listings publish the rate up front and nobody bids. The tradeoff: you build training data for AI labs, not products for clients.

Which programming languages pay the most?

The rates table on this page answers that from today’s listings. Seniority moves the rate more than language does: on the same marketplace, a staff engineer auditing agent traces earns a multiple of what entry coding tasks pay.

Do I need machine learning experience?

No. The labs employ ML researchers. They pay you for engineering judgment: reading code critically, writing tests that catch real bugs and explaining a fix in plain English.

Can I freelance here while holding a full-time job?

Usually, if your employment agreement allows paid outside work. You produce training data, not a product, so invention assignment clauses rarely reach it. Confidentiality runs both ways: never paste employer code into a task, and never reuse project material elsewhere.

Other places to find freelance software engineer work

AI training pays for judgment, not shipped product. If you want client projects, these are the established routes.

  • Upwork. The largest open marketplace. You bid with paid Connects, and the service fee runs from 0% to 15% per contract.
  • Toptal. Says it accepts 3% of applicants, then matches you with clients. The screen takes several weeks.
  • Gun.io. Senior developers, mostly in the US. You set your rate and it finds the client.
  • Contra. Commission-free profiles and payments for freelancers who bring their own clients.
  • Your own network. Past clients and former colleagues. No platform fee, and they already trust your code.

The screen is where these roles are won

Every marketplace above screens with an interview or assessment in your own domain before assigning paid work. Run that interview with Skillora first and get feedback on how you explained your reasoning, not just on what you said.

Practise the screen free

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