# Software Engineer, Full Stack (Senior, Staff+)

**Company:** [Kustomer](https://hotfix.jobs/companies/kustomer)
**Location:** New York, NY
**Role:** Fullstack Engineering
**Salary:** $130k – $215k/yr
**Experience:** 7+ years
**Skills:** Node.js, React, Go, MongoDB, Elasticsearch, AWS, AI, Github Copilot, API Design, LangChain
**Posted:** 2026-02-04

> Senior full stack engineer builds end-to-end features in small pods using Node.js, React, Golang, and AWS, integrates AI capabilities, optimizes performance, and mentors juniors. Requires 7+ years experience, strong systems knowledge, and AI tool proficiency.

## Job Description

## What You’ll Do
- Ship full-stack features end-to-end as a member of a Pod, owning scope from problem definition through production, using technologies like **Node.js**, **React**, **Golang**, **MongoDB**, **ElasticSearch**, and **AWS**.
- Develop APIs and integrate with external services and databases, ensuring data integrity and security.
- Build front-end interfaces with a focus on user experience, responsiveness, and accessibility.
- Design and implement **AI-powered** features where they enhance end-user experience or improve platform efficiency.
- Contribute to scope and tradeoff decisions alongside your Pod Lead; own what's in scope, escalate what isn't, and communicate progress proactively.
- Optimize application performance through caching, efficient algorithms, and database indexing.
- Write thorough unit and integration tests to ensure quality and reliability.
- Conduct code reviews, provide constructive feedback, and mentor junior engineers to uphold a high quality bar.
- Share production support responsibility on a rotating basis, including on-call and bug triage, distributed equitably across the team.
- Stay current with emerging AI tools, full-stack technologies, and industry trends — and actively propose and champion those that improve team velocity, quality, and development practices.
- Ramp quickly on unfamiliar parts of the codebase aided by AI tooling, consistent code hygiene, and a deep engineering foundation.

## Your Qualifications
- **7+ years** of progressive software development experience and a **Bachelor's degree** in Computer Science, Software Engineering, or a related field.
- Comfortable working across frontend and backend.
- Understand how systems work at depth and have experience with cloud platforms like **AWS** or similar. Data structures, algorithms, concurrency, distributed systems, **API design**, database internals.
- Hands-on experience with modern **AI developer tools**, such as **GitHub Copilot**, **Cursor**, or **Claude Code**.

## Nice to Have
- Familiarity with integrating **AI** or **ML-powered** capabilities into web applications, even at a prototype or feature level.
- Exposure to integrating third-party **AI APIs** or frameworks (e.g., **OpenAI**, **Anthropic**, **LangChain**, or vector databases like **Pinecone**).
- Interest in exploring how AI can enhance developer workflows and improve product functionality.

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**Apply:** https://hotfix.jobs/jobs/209a6170-c719-4da1-a664-49f5f1d50b67
**Canonical:** https://hotfix.jobs/jobs/209a6170-c719-4da1-a664-49f5f1d50b67