AI Applications Engineer

COROS AI; United States; Remote; USD 140,000 - 210,000; Full time

Job summary

COROS AI is seeking a remote, full-time lead engineer to own a client AI companion end to end. You will architect and ship agents, tools, retrieval, and the app surface, with a focus on reliability and cost.

You will work with Claude and the Anthropic SDK, build stateful agents, ensure grounded responses with citations, and collaborate weekly with client product owners to deliver updates and improvements.

Qualifications

• Three+ years shipping full-stack software used by real users.
• Strong backend fundamentals: APIs, data, background jobs, containers, deployments.
• Deep TypeScript proficiency and solid grounding in HTTP, SQL, concurrency, and data structures.
• Working knowledge of at least one major cloud platform (GCP, AWS, or Azure).
• Production experience with language models, including prompting, context, tool use, retrieval, evaluation, latency, and cost.
• Clear written and spoken English, with the ability to explain technical decisions to non-engineer founders.
• Bachelor's degree in CS or closely related field; strong body of work considered.

Responsibilities

• Own a client AI companion end to end, including agents, tools, retrieval pipelines, app surfaces, backend services, deployment, and runtime cost.
• Build with Claude and the Anthropic SDK, including streaming tool-use loops, structured outputs, prompt caching, and evaluation harnesses that catch incorrect outputs before users see them.
• Develop stateful agents capable of remembering prior context, scheduling follow-up work, and acting autonomously within defined guardrails.
• Ground every response in cited sources, ensuring the model never improvises on legal, financial, or procedural questions.
• Migrate production data off legacy systems without losing any records.
• Ship weekly alongside client product owners and document what was released.

Skills

Full-stack engineering

TypeScript

Backend development

Cloud platforms

LLM integration

Prompt engineering

Data structures

English communication

Education

B.S. in CS

Tools

Claude Code

Anthropic SDK

VS Code

Job description

Role overview

A remote, full-time lead engineering role focused on building and operating AI companions deployed inside other companies. The position owns a single client engagement end to end, covering agents, tools, retrieval, the application layer, backend services, deployment, and ongoing operating cost. It is suited to a full-stack engineer comfortable leading technical decisions and shipping weekly.

Responsibilities

• Own a client AI companion end to end, including agents, tools, retrieval pipelines, app surfaces, backend services, deployment, and runtime cost.
• Build with Claude and the Anthropic SDK, including streaming tool-use loops, structured outputs, prompt caching, and evaluation harnesses that catch incorrect outputs before users see them.
• Develop stateful agents capable of remembering prior context, scheduling follow-up work, and acting autonomously within defined guardrails.
• Ground every response in cited sources, ensuring the model never improvises on legal, financial, or procedural questions.
• Migrate production data off legacy systems without losing any records.
• Ship weekly alongside client product owners and document what was released.

Requirements

• Three or more years of experience shipping full-stack software used by real users, including on-call responsibility for systems you built.
• Strong backend fundamentals: APIs, relational data, background jobs, containers, and deployments, with the ability to stand a service up and keep it running.
• Deep TypeScript proficiency and solid grounding in HTTP, SQL, concurrency, and data structures.
• Working knowledge of at least one major cloud platform (Google Cloud, AWS, or Azure) and willingness to learn the others.
• Production experience with language models, including prompting, context, tool use, retrieval, evaluation, latency, and cost.
• Clear written and spoken English, with the ability to explain technical decisions to non-engineer founders.
• Demonstrated fluency with Claude Code and VS Code, with concrete examples of work done in both.
• A bachelor's degree in computer science or a closely related field, though exceptional candidates with a strong body of work are also considered.

Nice to have

• Experience with edge runtimes or stateful serverless systems.
• Background migrating legacy applications without downtime.
• Multilingual product work.
• Evaluation and safety testing for language-model applications.