# Senior Software Engineer, Fullstack
**Company:** [Ai2](https://hotfix.jobs/companies/ai2)
**Location:** Seattle, WA
**Salary:** $126K-$189K
**Experience:** 8+ years
**Skills:** React, Python, JavaScript, HTML, CSS, AWS, GCP, Datadog, Heap, Prompt Engineering
**Posted:** 2026-05-02
> Builds fullstack AI-powered applications for scientific discovery using React for UIs and Python for backends. Collaborates with designers, PMs, and researchers; requires 8+ years experience, strong Python/React skills, and cloud/AI integration expertise.
## Job Description
## Your Next Challenge
- Work closely with UX designers, product managers, and research scientists to develop rich UI experiences using React and robust backend services in Python
- Engage in the entire software development lifecycle, from ideation and design to implementation and testing to deployment and operational support, with a strong sense of ownership for results
- Scale our systems in a cost-effective and sustainable manner and be a driving force behind continuous improvements in reliability and automation
- Improve team velocity through contributions to software design, feature development, platform and framework enhancements, capacity planning, and deployment tooling
- Help set and maintain best practices in how we measure, monitor, and respond to system availability, latency, and general application health
- Communicate effectively across engineering, product, and research teams to align priorities and drive projects to completion
- Mentor less-senior engineers on the team in both technical and non-technical skills

## What You’ll Need
- Bachelor's degree and 8+ years of technical experience; relevant experience may substitute for education
- Professional experience with web development using **JavaScript**, **HTML**, and **CSS**
- Strong **Python** engineering skills
- Proficiency with front-end frameworks such as **React**
- Experience with **AWS**, **Google Cloud**, or similar cloud platforms
- Experience with analytics and observability tools like **Heap**, **Datadog**, or similar for monitoring performance, system health, and user interactions
- Solid understanding of integrating AI-powered capabilities into applications, including prompt engineering, memory management, agent workflows, and external tool integrations
- Strong communication skills and a sense of ownership for results

**Compensation:** Base salary range $126,000 - $189,000, plus generous bonus plans.
**Apply:** https://hotfix.jobs/jobs/senior-software-engineer-fullstack-at-ai2-adc38246-a212-40ea-9ff3-c42004f7c7d9
**Canonical:** https://hotfix.jobs/jobs/senior-software-engineer-fullstack-at-ai2-adc38246-a212-40ea-9ff3-c42004f7c7d9