Senior Software Engineer (Remote | $30–$100/hr)

Synthires; Lisboa; On-site; EUR 37,000 - 123,000; Full time

Benefits offered by this job

Output-based pay

High volume opportunities

Fast onboarding (24–48h)

Job summary

Synthires is seeking experts to help design challenging coding tasks and deterministic verifiers for AI training. You will implement feature work, debug and optimize code, and participate in thorough testing to ensure solution quality.

Start timeline is 24–48 hours after onboarding, with an output-based compensation model and high-volume opportunities available. Prior AI experience is not required; strong software engineering skills are key.

Qualifications

• Backend experience with Java, Node.js, Go, Rust, TypeScript, Python, C++ or similar.
• Experience building scalable services and APIs.
• Strong debugging, performance optimization, and automated testing skills.
• Solid code review and software engineering judgment.

Responsibilities

• Create realistic coding tasks involving feature implementation and bug fixing.
• Build deterministic verifiers that accept valid solutions and reject incorrect ones.
• Debug, test, optimize, and refactor code.
• Evaluate solutions using strong code review and testing practices.

Skills

Java

Node.js

Go

Rust

TypeScript

Python

C++

Job description

Help train next-generation AI systems by creating challenging coding tasks and implementing deterministic verifiers that distinguish valid solutions from incorrect ones. No prior AI experience is required — your software engineering expertise is what matters.

Key Responsibilities

• Create realistic coding tasks involving feature implementation and bug fixing.
• Build deterministic verifiers that accept valid solutions and reject incorrect ones.
• Debug, test, optimize, and refactor code.
• Evaluate solutions using strong code review and testing practices.

Required Qualifications

• Strong backend experience with Java, Node.js, Go, Rust, TypeScript, Python, C++, or similar.
• Experience building scalable services and APIs.
• Strong debugging, performance optimization, and automated testing skills.
• Solid code review and software engineering judgment.

Preferred Qualifications

• Experience with large-scale application development and refactoring.
• Strong knowledge of algorithms, data structures, and computer science fundamentals.
• Experience designing test strategies, maintaining large test suites, or diagnosing flaky tests.
• Strong analytical, problem-solving, and technical communication skills.

Compensation

• $30–$100/hour, output-based.
• Approximately 100 positions available.
• Minimum weekly task submissions apply.

Start Timeline:

• Selected experts are expected to begin their first tasks within 24–48 hours of onboarding.