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About the Role

Eulerity is seeking an engineer to design, build, and ship developer-facing SDKs. This role involves owning the SDK as a product, building AI-powered automation workflows, and collaborating across teams to translate designs into shipped solutions.

Responsibilities

• Designing, building, and shipping developer-facing SDKs consumed by other engineers.
• Owning the SDK as a product: the public API surface, TypeScript types, semantic versioning, packaging/distribution, backwards compatibility, and documentation.
• Building and maintaining AI-powered automation workflows that connect our product to internal and external systems.
• Developing and testing new features using AI-assisted tooling and autonomous agents, maintaining the codebase, integrating with APIs and data models, and owning the PR lifecycle (writing, reviewing, and incorporating feedback).
• Collaborating across web, mobile, and backend teams to align on best practices, shared architecture, and product direction.
• Partnering with Product and Design to translate designs and prototypes into shipped solutions for our users and the engineers who build on our SDK.

Requirements

• Proven experience designing and shipping a developer-facing SDK, library, or public API consumed by other engineers — including the public API/interface design, semantic versioning, and backwards-compatibility discipline that come with it.
• Strong separation-of-concerns judgment — able to design framework-agnostic core logic (data, state, domain types) cleanly decoupled from thin, framework-specific bindings, so the same core can support multiple front-end frameworks over time.
• Experience packaging and distributing libraries: bundling (e.g., tsup, Rollup, Vite), ESM/CJS output, tree-shaking and bundle-size awareness, and npm publishing.
• 2–3 years of professional experience with React & TypeScript, including building reusable, composable components and using strong types as a public contract.
• Well-versed in building custom AI automation workflows (LLM API integrations, agentic tooling, or similar).
• Solid understanding of fundamentals (HTML/CSS/JavaScript, working with APIs).
• Familiarity with standard engineering workflows (PRs, code review, agile).
• Strong written communication, including clear technical documentation.
• Based in the NYC metro area and able to work hybrid from our NYC office.
• Authorized to work in the US.

Skills

• SDK/library builder
• AI-first engineer
• React
• TypeScript
• HTML
• CSS
• JavaScript
• API integrations
• Technical documentation

Location

• NYC metro area
• NYC office

Work Type

• Hybrid

Experience Level

• 2-3 years of professional experience

Salary/Compensations

• $100,000 - $125,000

Benefits

• Comprehensive benefits (Medical, Dental, Vision)
• Unlimited PTO
• In-office lunch stipend and unlimited snacks
• Commuter benefits
• 401(k) with company match
• Summer Fridays

About the Company

• Eulerity is a fast-growing marketing technology company transforming how franchises and small businesses approach digital advertising.
• Built by former leaders from Google, Facebook, and Yahoo!, our platform combines decades of experience in engineering and marketing to deliver an industry-leading, automated solution.
• We make it easy to plan, launch, and analyze paid campaigns across Google Search, Meta (Facebook/Instagram), Display, Video, and organic social - all from one intuitive platform.
• We believe breakthrough results happen when technology, strategy, and creativity come together.
• By combining automation with human insight, we empower brands to scale smarter, move faster, and grow stronger.
• Internally, we're just as committed to growth.
• We cultivate a culture where ambitious, curious, and driven individuals are empowered to lead, learn, and elevate those around them.