Open Source Engineer - Typescript/Javascript at Braintrust

San Francisco, California, United States

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Not SpecifiedCompensation

Senior (5 to 8 years)Experience Level

Full TimeJob Type

UnknownVisa

Finance, Healthcare, TechnologyIndustries

Requirements

Deep expertise in Typescript/Javascript and ability to build 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
Passionate about developer experience, including clean APIs, clear documentation, thoughtful error handling, and backward compatibility
Skilled in wrapping, patching, or extending existing frameworks and SDKs to inject observability and control without breaking workflows
Experience maintaining or contributing to production-grade open-source libraries used across multiple environments
Customer-obsessed and passionate about solving real-world problems for developers

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
Act as a community ambassador: talk with users, understand their issues, help them get fixes merged, and show deep empathy for users
Own the full SDK lifecycle: design, implementation, release, documentation, and community support

Skills

Key technologies and capabilities for this role

TypeScriptJavaScriptOpenAIAnthropicGeminiSDKAPI DesignLLM EvaluationAI ObservabilityTestingProfilingRelease Automation

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, and flexible time off.

Is the salary specified for this position?

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

What skills are required for the Open Source Engineer role?

Deep expertise in Typescript/Javascript is required, along with proficiency in SDK tooling like testing frameworks, profilers, CI/CD pipelines, and packaging systems. Experience maintaining production-grade open-source libraries and focusing on developer experience, clean APIs, documentation, and integrations with AI providers like OpenAI and Anthropic is also essential.

What is the work arrangement or location policy?

This information is not specified in the job description.

What makes a strong candidate for this role?

Strong candidates are customer-obsessed, passionate about developer experience and API craftsmanship, have deep Typescript/Javascript expertise, experience with open-source libraries, and bonus points for contributions to popular projects or familiarity with AI/observability tools.

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.

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