Open Source Engineer - Ruby at Braintrust

San Francisco, California, United States

Apply Now

Not SpecifiedCompensation

Senior (5 to 8 years)Experience Level

Full TimeJob Type

UnknownVisa

AI, Technology, Finance, HealthcareIndustries

Requirements

Deep expertise in Ruby and understanding of building fast, idiomatic, and reliable libraries in that ecosystem
Proficient with tooling for robust SDKs, such as testing frameworks, profilers, CI/CD pipelines, and packaging systems
Customer-obsessed and passionate about solving real-world problems for developers
Care deeply about developer experience, including clean APIs, clear docs, thoughtful error handling, and backward compatibility
Know how to wrap, patch, or extend existing frameworks and SDKs to inject observability and control without breaking developer workflows
Experience maintaining or contributing to production-grade open-source libraries, ideally used across multiple environments
Bonus: Contributed to popular open source projects, led SDK adoption at organization, familiar with tracing and observability tools like OpenTelemetry, or worked on tools in the LLM/AI ecosystem

Responsibilities

Build elegant, idiomatic, and resilient SDKs that power Braintrust’s LLM evaluation and AI observability platform
Ensure libraries are easy to use, efficient to run, and a delight to work with, prioritizing developer experience and performance
Integrate with major AI providers, frameworks, and platforms such as OpenAI, Anthropic, and Gemini
Build tools and automation to improve testing, profiling, and simplify release workflows
Collaborate closely with backend, platform, and product teams to ensure a cohesive and polished developer experience
Be a great community ambassador: talk with users, understand their issues, help them get fixes merged, and have deep empathy for users
Own the full SDK lifecycle: design, implementation, release, documentation, and community support

Skills

Key technologies and capabilities for this role

RubySDK DevelopmentAPI DesignOpenAIAnthropicGeminiTestingProfilingAutomationOpen SourceLLM EvaluationAI Observability

Questions & Answers

Common questions about this position

What benefits are offered for this role?

Benefits include medical, dental, and vision insurance, 401k plan, daily lunch, snacks, and beverages, flexible time off, competitive salary, and equity.

Is this a remote position or does it require office work?

This information is not specified in the job description.

What skills are required for the Open Source Engineer role?

Deep expertise in Ruby is required to build fast, idiomatic, and reliable libraries, along with proficiency in SDK tooling like testing frameworks, profilers, CI/CD pipelines, and packaging systems. Candidates should also prioritize developer experience through clean APIs, documentation, error handling, and backward compatibility, and have experience maintaining production-grade open-source libraries.

What is the salary for this position?

The job description mentions a competitive salary, but no specific range is provided.

What makes a strong candidate for this role?

Strong candidates are customer-obsessed, passionate about developer experience and API craftsmanship, have deep Ruby expertise and open-source library experience, and bonus points for contributions to popular projects, SDK adoption, or familiarity with tracing tools like OpenTelemetry and the LLM/AI ecosystem.

Braintrust

Talent marketplace connecting tech professionals with businesses

About Braintrust

Braintrust connects highly skilled tech professionals with businesses looking for their expertise in a talent marketplace. The platform charges a low 15% fee, significantly less than traditional staffing agencies, allowing companies to maximize their budgets. Using advanced technology, Braintrust matches businesses with the top five candidates for their projects within 48 hours, streamlining the hiring process. The goal is to create a transparent and efficient platform that benefits both businesses and tech professionals.

San Francisco, CaliforniaHeadquarters

2018Year Founded

$125.5MTotal Funding

LATE_VCCompany Stage

Consulting, AI & Machine LearningIndustries

201-500Employees

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Unlimited Paid Time Off

Competitive salary and equity

Phone/Internet Stipend

Risks

Increased competition from blockchain-based platforms could erode Braintrust's market share.

Cryptocurrency market volatility may impact the value of BTRST tokens and user satisfaction.

Regulatory scrutiny on blockchain transactions could pose compliance challenges for Braintrust.

Differentiation

Braintrust offers a blockchain-powered freelancer marketplace, reducing costs by eliminating middlemen.

The platform charges a flat 10% project fee, allowing talent to keep 100% revenue.

Braintrust's AI matches businesses with top professionals within 48 hours, streamlining hiring.

Upsides

AI-driven recruitment tools like AIR align with growing trends in hiring technology.

Crypto payment integration enhances Braintrust's appeal in the freelance marketplace.

Partnership with Behance expands Braintrust's reach in the creative community.

Land your dream remote job 3x faster with AI

Try Jobo Free