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

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

Job summary

Synthires is seeking experts to 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.

Selected experts will design realistic tasks focused on feature implementation and bug fixing, build verifiers, and participate in rigorous debugging, testing, and code review to ensure high-quality results.

Qualifications

• Backend experience with Java, Node.js, Go, Rust, TypeScript, Python or C++.
• 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++

Backend

APIs

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.