Hiring SDK Engineers: The Complete Guide

# SDK Engineer

**Location:** San Francisco, CA (Hybrid) · **Employment Type:** Full-time · **Level:** Mid-Senior

## About [Company]

[Company] provides APIs that power communications for 200,000+ developers. Our SDKs are how developers integrate with us—they're the face of our platform and often the first code developers write with our product.

Great SDKs drive adoption. When developers have a smooth integration experience, they build more with us. When SDKs are frustrating, they look elsewhere. Your work directly impacts platform growth.

**Why join [Company]?**

- Own developer experience for 200,000+ developers
- Work across multiple languages (Python, JS, Go, Java, and more)
- Direct impact on platform adoption and developer happiness
- Join a 6-person SDK team within a 150-person engineering org
- Series C company with strong developer community
- Competitive compensation with meaningful equity

## The Role

We're looking for an SDK Engineer to help us build world-class client libraries and developer tools. You'll own SDKs in multiple languages, design APIs that developers love, and create documentation that actually helps.

SDK engineering is about empathy. You're building for other developers, and you need to think like they do. What's obvious to you (who knows the platform intimately) needs to be discoverable by someone seeing it for the first time. Error messages should help, not confuse. Breaking changes should be rare and well-communicated.

The ideal candidate writes idiomatic code in multiple languages, obsesses over developer experience, and takes pride in clean API design.

## What You'll Work On

### First 30 Days
- Onboard to our SDK codebases, API design, and release processes
- Understand our developer community and common integration patterns
- Ship your first SDK improvement or fix

### First 90 Days
- Own one or more language SDKs
- Contribute to API design discussions
- Improve documentation and code examples
- Respond to developer feedback and issues

### First Year
- Lead SDK initiatives across multiple languages
- Shape API design for new platform features
- Build tooling that improves SDK development
- Establish SDK best practices and quality standards

## Objectives of This Role

- Improve developer satisfaction with SDK experience
- Reduce time-to-first-API-call for new developers
- Maintain SDK quality across 5+ languages
- Ship SDK updates in sync with API releases
- Build tooling that scales SDK development

## Responsibilities

**SDK Development (60%)**
- Build and maintain SDKs in multiple languages (Python, JavaScript, Go, Java, etc.)
- Write idiomatic code that feels natural in each language
- Implement new API features across all SDKs
- Handle authentication, error handling, and retries consistently
- Test SDKs thoroughly across versions and environments

**Documentation & Examples (25%)**
- Write clear, accurate API documentation
- Create code examples that solve real problems
- Build quickstart guides and tutorials
- Maintain API reference documentation
- Gather and incorporate developer feedback

**Tooling & Process (15%)**
- Build CLI tools and developer utilities
- Create code generation tooling to scale SDK development
- Design versioning and release processes
- Implement backward compatibility strategies
- Collaborate with API teams on design reviews

## Required Skills and Qualifications

**Technical Skills**
- 4+ years of software engineering experience
- Strong proficiency in 3+ programming languages
- Experience building public libraries, SDKs, or APIs
- Understanding of idiomatic patterns in multiple language ecosystems
- Strong API design skills
- Testing expertise across languages and environments

**Developer Experience**
- Excellent documentation and technical writing
- Developer empathy—ability to think like your users
- Experience with versioning and backward compatibility

**Soft Skills**
- Clear communication in documentation and code
- Responsiveness to developer feedback
- Collaboration with API and product teams

## Preferred Skills and Qualifications

- Open source library maintenance experience
- Code generation tooling experience (OpenAPI, gRPC)
- Developer advocacy or community engagement
- Experience with SDK testing automation
- Background in API design or developer tools
- Published libraries with significant adoption

## Tech Stack

**Languages:** Python, JavaScript/TypeScript, Go, Java, Ruby, PHP, .NET

**API Tooling:** OpenAPI for specs, custom code generation

**Documentation:** ReadMe, custom API reference

**Testing:** Language-specific testing frameworks, integration testing

**CI/CD:** GitHub Actions, automated SDK releases

## Compensation and Benefits

**Salary:** $140,000 - $185,000 (based on experience)

**Equity:** 0.04% - 0.12% (4-year vest, 1-year cliff)

**Benefits:**

*Health & Wellness*
- Medical, dental, and vision insurance (100% covered)
- $100/month wellness stipend
- Mental health support through Modern Health

*Time Off*
- Unlimited PTO with 15-day minimum encouraged
- 11 paid company holidays
- 16 weeks paid parental leave

*Professional Development*
- $2,500 annual learning budget
- Conference attendance (language-specific conferences)
- Open source contribution time

*Financial*
- 401(k) with 4% company match
- Equity refresh grants annually

*Workspace*
- $1,500 home office setup allowance
- Hybrid work (2-3 days in SF office)
- MacBook Pro and equipment of choice

## Engineering Culture

**How we work:**
- Developer experience obsession—we use our own SDKs
- Quality over speed—SDKs must be reliable
- Responsive to community feedback
- Consistent experience across all languages
- Breaking changes only when necessary with clear migration

**What we value:**
- Developer empathy—think like our users
- Idiomatic code in every language
- Documentation as important as code
- Open communication with developer community
- Work-life balance and sustainable pace

## Interview Process

Our interview process typically takes 2 weeks.

- **Step 1: Recruiter Screen** (30 min)
  Background discussion and role overview.

- **Step 2: Technical Screen** (60 min)
  Multi-language coding and API design discussion.

- **Step 3: SDK Deep Dive** (75 min)
  Review an existing SDK or API design, discuss improvements.

- **Step 4: Multi-Language Coding** (90 min)
  Implement the same feature in 2 languages to show breadth.

- **Step 5: Documentation Review** (45 min)
  Review and improve existing documentation.

- **Step 6: Team Interviews** (2 x 30 min)
  Meet potential teammates.

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*[Company] is an equal opportunity employer.*