Open Source Engineer Job at YC Work at a Startup (San Francisco)

Open Source Engineer

Zed is a next-generation code editor that's engineered from scratch in Rust to b...

Location

Salary:

Not provided

Zed Industries

Expiration Date

Until further notice

Requirements

Strong programming skills and problem-solving ability
Proficiency in Rust
English: excellent in writing, strong in speaking (for effective pair programming and smooth communication with the community)
Enthusiasm for open source and collaborative development
User empathy and a strong desire to make Zed better for our users

Job Responsibility

Implement features that the community will love
Work strategically on fixing bugs important to the community
Make every change reinforce Zed's speed and clean UI
Review pull requests from the community, knowing when it's best to merge, request a change, pair with the author, or close with a polite yet informative comment
Curate the backlog of the bugs and features suitable for the contributors to tackle (whether it's a first-timer or a seasoned community champion)
Pair with the engineers across the company to learn different parts of the codebase
Help improve our GitHub processes and tooling

Open Source Engineer

mcp-use is building open-source dev tools and infrastructure for MCP to help dev...

Location

United States; Switzerland , San Francisco; Zürich

Salary:

100000.00 - 150000.00 USD / Year

YC Work at a Startup

Expiration Date

Until further notice

Requirements

History of contributing to or leading open source projects
Already active in the MCP world or have built MCP-related tools in the past
Enjoy writing and talking to people as much as writing code
Organized and disciplined about keeping projects moving forward
Want to be the person who helps thousands of developers enter the AI era

Job Responsibility

Manage the community and run open source repositories
Be the MCP expert and point of contact for the official MCP committee
Evangelize the SDK as the gold standard for creating MCP-enabled agents and servers
Bridge the gap by talking to developers daily and using feedback to improve tools
Create guides, examples, and documentation to make it easy to get started with MCP

What we offer

0.50% - 1.00% equity

Fulltime

Senior Open Source Engineer

We’re looking for a Senior Open Source Engineer to help expand the reach of Lanc...

Location

Salary:

180000.00 - 250000.00 USD / Year

LanceDB

Expiration Date

Until further notice

Requirements

10+ years of experience building high-performance databases, big data systems, or large-scale data services
Deep understanding of internals of open-source Big Data or AI training systems (e.g., Hadoop, Spark, Flink, Ray, Iceberg, Delta Lake, Hudi, ClickHouse, Trino, Presto, PyTorch, or JAX)
Strong experience with high-performance computing in Java or Scala
Experience with Rust (or willingness to learn it)
Proven ability to move fast, work independently, and collaborate with a high-caliber team

Job Responsibility

Driving open-source community efforts to integrate the Lance format with Spark, Hive Metastore, Presto, Trino, Ray, and other data infrastructure systems
Designing and maintaining efficient distributed Lance dataset operations
Building efficient indices to enable predicate pushdown and accelerate queries in Spark, Ray, or Trino
Working on table formats, data encodings, and various aspects of the Lance format in Rust
Operating and improving internal data processing infrastructure
Promoting the Lance format in open-source communities and at Big Data conferences

What we offer

Medical, dental, vision, and life insurance
401(k) retirement plan
Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA)
Commuter benefits
Generous paid time off
Offers Equity
Generous learning budget and support for open-source contributions

Fulltime

Developer Relations Engineer - Open Source & Integrations

Cerebras Systems builds the world's largest AI chip, 56 times larger than GPUs. ...

Location

United States; Canada , Sunnyvale; Toronto

Salary:

Not provided

Cerebras Systems

Expiration Date

Until further notice

Requirements

Bachelor’s or Master's degree in computer science or related field, or equivalent practical experience
4+ years professional software engineering experience (or equivalent open-source track record)
Solid understanding of GenAI applications and design patterns such as RAG
Proficiency in Python and/or TypeScript/JavaScript
Hands-on with at least one modern LLM framework (LangChain, LlamaIndex, CrewAI, AutoGen, etc.)
Multiple non-trivial open-source contributions, preferably to GenAI projects
Ability to move quickly from whiteboard idea to working prototype
bias toward shipping polished developer experiences
Strong communication skills—you enjoy writing clear docs and telling a compelling technical story

Job Responsibility

Design, develop, and maintain open-source libraries, SDKs, and sample repos that make Cerebras the easiest-to-adopt inference platform
Create production-quality demo applications that highlight low latency, high gen speed, and cost advantages
Build and own CI/CD pipelines, tests, and release automation for all public repos
Collaborate with partner engineering teams to embed Cerebras inference into their products and publish joint reference architectures
Collect developer feedback, identify usability gaps, and influence the Cerebras API roadmap
Contribute to engineering blogs, tutorials, and conference talks to grow community awareness and adoption

What we offer

Build a breakthrough AI platform beyond the constraints of the GPU
Publish and open source their cutting-edge AI research
Work on one of the fastest AI supercomputers in the world
Enjoy job stability with startup vitality
Our simple, non-corporate work culture that respects individual beliefs

Senior Software Engineer, Open Source Nexus Server

As a Senior Software Engineer, you will get the chance to design, build, and mai...

Location

United States

Salary:

185000.00 - 225000.00 USD / Year

Temporal

Expiration Date

Until further notice

Requirements

At least 6 years of experience in a production environment as an 'Arranger' and/or 'Builder/Enhancer' of highly scalable distributed systems
Solid computer science fundamentals in distributed systems concepts including multi-threading and concurrency
2+ years experience developing customer facing APIs and Frameworks
Experience writing concurrent code in production with languages like Go or Java or other applicable languages with skill level as 'high end of Intermediate' and/or 'Advanced' or 'Expert' levels

Job Responsibility

Design and implement core backend service features for Nexus
Provide appropriate test coverage for unit, integration, and performance for your feature ownership area
Clearly document design choices and operational knowledge to successfully deploy and run service with those features
Provide appropriate service level logs and metrics to make features operational for cloud service setup
Provide appropriate alerts, dashboards, and runbooks for production

What we offer

Unlimited PTO, 12 Holidays + 2 Floating Holidays
100% Premiums Coverage for Medical, Dental, and Vision
AD&D, LT & ST Disability, and Life Insurance (Standard & Supplemental Available)
Empower 401K Plan
Additional Perks for Learning & Development, Lifestyle Spending, In-Home Office Setup, Professional Memberships, WFH Meals, Internet Stipend and more
$3,600 / Year Work from Home Meals
$1,500 / Year Career Development & Learning
$1,200 / Year Lifestyle Spending Account
$1,000 / Year In-Home Office Setup (In addition to Temporal issued equipment)
$500 / Year Professional Memberships

Fulltime

Staff Software Engineer - Open Source Server

Temporal is an open source programming model that can simplify code, make applic...

Location

United States

Salary:

170000.00 - 250000.00 USD / Year

Temporal

Expiration Date

Until further notice

Requirements

Rich experience as an 'Arranger' and/or 'Builder/Enhancer' in large-scale distributed systems design (reliability, scalability)
Operational experience in large-scale distributed systems environments
Experience developing highly concurrent systems
Demonstrated experience writing concurrent code in production as Advanced or Expert levels
Knowledge and experience of reliability to ensure the high reliability of the Temporal system
Experience with Elastic Search or Clickhouse
Ideas and actions to improve the velocity of the team

Job Responsibility

Design and implement core backend service features
Provide appropriate test coverage for unit, integration, and performance for your feature ownership area
Clearly document design choices and operational knowledge to successfully deploy and run service with those features
Provide appropriate service level logs and metrics to make features operational for cloud service setup
Provide appropriate alerts, dashboards, and runbooks for production

What we offer

Unlimited PTO, 12 Holidays + 2 Floating Holidays
100% Premiums Coverage for Medical, Dental, and Vision
AD&D, LT & ST Disability, and Life Insurance (Standard & Supplemental Available)
Empower 401K Plan
Additional Perks for Learning & Development, Lifestyle Spending, In-Home Office Setup, Professional Memberships, WFH Meals, Internet Stipend and more
$3,600 / Year Work from Home Meals
$1,500 / Year Career Development & Learning
$1,200 / Year Lifestyle Spending Account
$1,000 / Year In-Home Office Setup (In addition to Temporal issued equipment)
$500 / Year Professional Memberships

Fulltime

Open Source Design Engineer

We're looking for a Design Engineer to build ambitious interfaces at the frontie...

Location

United States

Salary:

145000.00 - 185000.00 USD / Year

Arize

Expiration Date

Until further notice

Requirements

Have strong frontend engineering skills (React, TypeScript) paired with design sensibility
Think deeply about interaction design, information architecture, and developer experience
Are curious about AI systems and eager to learn how agents, evaluations, and observability work
Enjoy prototyping quickly and iterating toward polish
Care about accessibility, performance, and craft
Thrive in open-source communities and async collaboration

Job Responsibility

Design and build compelling product experiences for Arize Phoenix across UI-driven and programmatic workflows
Create interactive visualizations for embeddings, traces, evaluation runs, and agent/tool workflows
Develop reusable components and templates for our design system, from concept to production
Build Agent Experience primitives: interaction contracts, human-in-the-loop workflows, and agent-friendly UI surfaces
Enable agents to query, navigate, trigger evaluations
Shape the patterns that define how humans and AI agents collaborate within a shared workspace
Prototype new AI features and UI patterns for visualizing performance, surfacing anomalies, and explaining AI behavior—especially for multi-step agent systems
Use AI-assisted UI generation to accelerate prototyping while maintaining craft, accessibility, and consistency
Push the boundaries of what's possible when your users include both humans and machines

What we offer

medical, dental, vision, 401(k) plan, unlimited paid time off, generous parental leave plan, others for mental and wellness support, competitive equity package, WFH monthly stipend to pay for co-working spaces

Fulltime

Senior Software Development Engineer, AI Open-Source Software

AMD is looking for a principal software developer to join our growing team. As a...

Location

United States , Santa Clara

Salary:

204000.00 - 306000.00 USD / Year

AMD

Expiration Date

Until further notice

Requirements

10+ years professional software development experience
Demonstrated capacity to technically lead and people manage junior to mid-level developers
Proficient in C/C++ & Python programming employing best software design practices
GPU software development or validation involving HIP, CUDA, or OpenCL
Experience with software libraries and API design
Exposure to Matrix/Tensor operations and numerical work
Software emulation to support FP numerical formats is a plus
Experience in software performance estimations, optimizations and debugging
Ability to closely interact with technical leads, developers, and test teams to maintain and release production software

Job Responsibility

Develop software in C++, Python, HIP, assembly, and SOTA programming technologies to enable key mathematical operations on GPU
Design GPU computational software libraries for AI, HPC applications
Aid management in planning, and delivering industry-leading software for current and future processors
Supervise small development team
Carry-out performance optimizations and projections for important use-cases to maximize hardware utilization
Support development of programs to sustain seamless performance analysis, and performance/functional test coverage
Identify and help resolve quality issues working closely with libraries development teams and other internal engineering teams

What we offer

Benefits offered are described: AMD benefits at a glance

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Open Source Engineer

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Open Source Engineer

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Senior Software Development Engineer, AI Open-Source Software

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