Series C · Software Development · 201-500Confidential

Software Development

Backend Software Engineer

$130,000 - $400,000

on-siteFull time4-10 yrsVisa Sponsorship

Posted September 22, 2025

This search is being worked on by Recruiting from Scratch (RFS). We work directly with the hiring teams to help them find the perfect candidate.

About This Role

Backend Software Engineer

  • Title of Role: Backend Software Engineer
  • Location: San Francisco, onsite
  • Company Stage of Funding: Series C — Software Development
  • Office Type: Onsite
  • Salary: $130K–$400K

Company Description

We're representing a dynamic company at the forefront of labor markets and AI research. This organization partners with leading AI labs and enterprises to provide essential human intelligence for AI development. With a vast talent network that trains frontier AI models, they are creating a new category of work where expertise drives AI advancement. This company is committed to building a fast-paced, ambitious team that collaborates closely with researchers and operators to redefine the systems shaping society.

What You Will Do

  • Design and build scalable backend APIs and services that support critical workflows for advanced AI companies.
  • Collaborate with product and design teams to rapidly ship features while maintaining high standards for code quality.
  • Write production-grade code and contribute to comprehensive technical documentation.
  • Participate in code reviews and technical design discussions to elevate team standards.
  • Solve complex real-world problems under practical constraints, impacting customer experiences directly.
  • Contribute to core systems that enhance training, evaluation, and scaling for leading AI labs.

Ideal Candidate Background

  • 5+ years of experience in backend software engineering with a strong proficiency in Python or equivalent languages.
  • Deep expertise in designing and scaling distributed systems, including APIs and SQL/NoSQL databases.
  • Skilled in cloud platforms like AWS or GCP, with experience in modern microservices architecture.
  • Proven track record of end-to-end ownership of complex backend projects and mentoring junior engineers.
  • Excellent communication skills with the ability to translate technical concepts into business impacts.

Preferred

  • Experience in high-growth startups or AI labs, particularly those focused on infrastructure and machine learning.
  • A strong understanding of system design principles with the ability to lead architecture discussions.

Compensation and Benefits

The salary for this role ranges from $130K to $400K, accompanied by a generous equity grant vested over four years and various relocation and housing bonuses. Enjoy additional perks such as a monthly stipend for meals, a free gym membership, and comprehensive health insurance.

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Requirements

Must Have

  • Backend APIs
  • AI/ML
  • Communication
  • Code Review
  • Technical Documentation
  • Production-grade Code
  • System Design

Nice to Have

  • -- General
  • Experience with multimodal models
  • Experience with OCR models
  • Experience with screenpipe, or other screenshot/keylogging tools
  • — Senior
  • Experience leading projects in AI/ML infrastructure or research-adjacent systems.
  • Familiarity with LLMs
  • evaluation benchmarks
  • or cutting-edge AI systems.
  • Prior experience at high-growth startups or top-tier tech companies.
  • Contributions to open-source projects or meaningful side projects.
  • Background in infrastructure
  • developer tooling
  • or high-performance systems.
  • — Mid lvl
  • Comfortable with LLM’s or have lead projects in this space.
  • Interest in cutting edge technology or working in the AI space.
  • Experience at top-tier tech companies or fast-scaling startups (internships or YOE).
  • Contributions to open source or shipped side projects that show initiative and curiosity.
  • Background in backend frameworks
  • infrastructure
  • or developer tooling.
  • Exposure to AI/ML infrastructure or high-performance systems.
  • Generalist with product intuition (comfortable wearing PM hat)

Skills & Technologies

Backend APIsAI/MLCommunicationCode ReviewTechnical DocumentationProduction-grade CodeSystem DesignPythonGoRustAWSGCP

Similar Roles

Interested in this role?

Submit your application and our team will be in touch.

Prefer to talk? Call (646) 495-3025

Job Details

DepartmentSoftware Engineering
Employment TypeFull time
Work Styleon-site
Experience4-10 years
Education* Ivy/strong engineering programs preferred but not required
Visa SponsorshipAvailable

Compensation

Base Salary$130,000 - $400,000

About the Company

Series C · Software Development · 201-500

Stage
Series C
Industry
Software Development
Size
201-500 employees
Founded
2023

About Recruiting from Scratch

Recruiting from Scratch is a premier talent agency connecting top candidates with high-growth companies. We specialize in placing engineers, product managers, and go-to-market talent at startups and enterprise companies backed by top VCs.