Software Engineer – Backend (Remote)

VaultKey Global Recruitment; India; On-site; INR 1,000,000 - 2,400,000; Full time

Job summary

VaultKey Global Recruitment is seeking a backend-focused engineer to help train next-generation AI systems. You will design and implement scalable services and APIs, work with Java, Node.js, Go, Rust, TS, Python, or C++, and craft robust verifiers for real-world solutions.

This role offers flexible hours and autonomy while you contribute to model learning and evaluation. You do not need prior AI experience; domain knowledge matters.

Qualifications

• Experience in backend development and scalable services.
• Comfort with debugging and performance work.
• Experience with API design and testing.
• Strong CS fundamentals.
• Ability to communicate technical concepts clearly.

Responsibilities

• Train AI systems by creating high-quality coding tasks.
• Implement deterministic verifiers to accept valid solutions.
• Review and optimize backend services and APIs.

Skills

Backend development

API design

Performance optimization

Code review

Testing

Job description

Schedule: Flexible and autonomous, you pick the hours and days (including weekends if desired)

I n this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters.

You'll create realistic, interesting and challenging coding tasks for AI to solve involving feature implementation and bug fixes, and implement deterministic verifiers that accept reasonable valid solutions and reject everything else.

What we're looking for

• Strong backend experience in Java, Node.js, Go, Rust, Typescript, Python, C++ or similar
• A track record building scalable services and APIs
• Comfort with debugging, performance work and automated testing
• Solid code review instincts

Preferred Qualifications

• Proven experience in backend development, with a track record of delivering high-quality and performant projects.
• Demonstrated success in identifying and resolving software bugs and system bottlenecks.
• Experience with codebase refactoring and implementing complex features in large-scale applications.
• Strong understanding of algorithms, data structures, and foundational computer science concepts.
• Excellent analytical, problem-solving, and technical communication skills.

Process

• Apply to the role, filling out the screening questions
• Complete AI Interview (approx. 30 minutes)