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Sr Fullstack Developer Jobs in Seattle, WA (NOW HIRING)

Ai2

Senior Software Engineer, Fullstack

Seattle, WA · On-site

$139K - $183K/yr

They are seeking a Senior Software Engineer, Fullstack to develop impactful AI-powered solutions by collaborating with UX designers, AI/ML experts, and research scientists to create seamless user ...

Ai2

Senior Software Engineer, Fullstack

Seattle, WA · On-site

$139K - $183K/yr

The Senior Software Engineer, Fullstack will work on developing AI-powered solutions by collaborating with UX designers, product managers, and research scientists to create impactful user experiences.

Ai2

Senior Software Engineer, Fullstack

Seattle, WA · On-site

$139K - $183K/yr

The Senior Software Engineer, Fullstack will develop impactful AI-powered solutions, collaborating with UX designers, AI/ML experts, and research scientists to create user-friendly interfaces and ...

Epic Games

Senior Full Stack Engineer

Bellevue, WA · On-site

$162K - $237K/yr

What You'll Do Fullstack Engineers on the Identity team impact a diverse set of account initiatives from end to end. These include internal apps like Epic Games Store sign-in and account management ...

Socket.dev

Senior Full Stack Engineer

Bellevue, WA · On-site

$162 - $238/hr

What You'll Do Fullstack Engineers on the Identity team impact a diverse set of account initiatives from end to end. These include internal apps like Epic Games Store sign-in and account management ...

Epic Games

Senior Full Stack Engineer

Bellevue, WA · On-site

$162K - $237K/yr

What You'll Do Fullstack Engineers on the Identity team impact a diverse set of account initiatives from end to end. These include internal apps like Epic Games Store sign-in and account management ...

Ai2

Senior Software Engineer, Fullstack

Seattle, WA · On-site

$139K - $183K/yr

... senior engineers on the team in both technical and non-technical skills Qualifications : Required : • Bachelor's degree and 8+ years of technical experience; relevant experience may substitute for ...

Databricks

Senior Software Engineer - Fullstack

Seattle, WA · On-site

$139K - $183K/yr

The Senior Full Stack Software Engineer will work collaboratively to create user-friendly data solutions, managing the entire project lifecycle from data loading to visualization and deployment.

NexHealth

Senior Software Engineer, Fullstack

Seattle, WA

$139K - $183K/yr

About the Role On our product-focused engineering teams at NexHealth, you'll build insanely great software that attracts new patients, improves the relationship between patients and their doctors ...

NexHealth

Senior Software Engineer, Fullstack

Seattle, WA · On-site

$165K - $230K/yr

Trusted by tens of thousands of providers and hundreds of health-tech developers - forging the infrastructure layer that modern healthcare needs About the Role On our product-focused engineering ...

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All JobsSr Fullstack Developer JobsSr Fullstack Developer Jobs in Seattle, WA

Sr Fullstack Developer information

See Seattle, WA salary details

$27

$67

$97

How much do sr fullstack developer jobs pay per hour?

As of Aug 17, 2026, the average hourly pay for sr fullstack developer in Seattle, WA is $67.44, according to ZipRecruiter salary data. Most workers in this role earn between $56.06 and $77.69 per hour, depending on experience, location, and employer.

What is a Sr Fullstack Developer?

A Sr Fullstack Developer is an experienced software engineer who is proficient in both frontend and backend development. They work with a variety of programming languages, frameworks, and databases to build fully functional web applications. In addition to coding, senior fullstack developers often lead projects, mentor junior developers, and help make architectural decisions. Their broad skill set allows them to handle tasks across the entire technology stack, ensuring that applications are efficient, scalable, and user-friendly.

What are some typical challenges a Sr Fullstack Developer faces when balancing front-end and back-end responsibilities?

Sr Fullstack Developers often need to juggle tasks across both the front-end and back-end, which can be challenging when priorities shift quickly or deadlines are tight. Balancing deep technical knowledge in multiple frameworks and languages while ensuring seamless integration requires strong organizational skills and effective communication with both UI/UX designers and backend engineers. Additionally, staying updated with evolving technologies on both ends is crucial, so time management and continuous learning are key to success in this role.

What are the key skills and qualifications needed to thrive as a Sr Fullstack Developer, and why are they important?

To thrive as a Sr Fullstack Developer, you need advanced proficiency in both front-end and back-end programming languages, frameworks, and a solid understanding of software architecture, typically supported by a computer science degree or equivalent experience. Familiarity with tools such as Git, Docker, CI/CD pipelines, cloud platforms, and relevant certifications like AWS Certified Developer or similar are often expected. Strong problem-solving abilities, effective communication, and a collaborative mindset are vital soft skills for this role. These competencies enable developers to deliver robust, scalable solutions and effectively drive projects to completion in dynamic team environments.

What is the difference between Sr Fullstack Developer vs Backend Developer?

AspectSr Fullstack DeveloperBackend Developer
Required SkillsProficiency in both frontend (JavaScript, HTML, CSS) and backend (Node.js, Python, Java)Specialized in server-side languages and database management
Work EnvironmentWorks on both client-facing and server-side componentsFocuses primarily on backend systems and APIs
Common UsageUsed across full product development teamsPrimarily in backend-focused roles within development teams

The main difference between a Sr Fullstack Developer and a Backend Developer is the scope of expertise. A Sr Fullstack Developer handles both frontend and backend tasks, while a Backend Developer specializes in server-side development. Both roles require strong programming skills, but the Fullstack role demands broader knowledge across the entire application stack.

What are popular job titles related to Sr Fullstack Developer jobs in Seattle, WA?

For Sr Fullstack Developer jobs in Seattle, WA, the most frequently searched job titles are:

What job categories do people searching Sr Fullstack Developer jobs in Seattle, WA look for?

The top searched job categories for Sr Fullstack Developer jobs in Seattle, WA are:

What cities near Seattle, WA are hiring for Sr Fullstack Developer jobs?

Cities near Seattle, WA with the most Sr Fullstack Developer job openings:

Sr Fullstack Developer jobs near you
Infographic showing various Sr Fullstack Developer job openings in Seattle, WA as of August 2026, with employment types broken down into 1% As Needed, 88% Full Time, 6% Part Time, and 5% Contract. Highlights an 86% Physical, 5% Hybrid, and 9% Remote job distribution, with an average salary of $140,275 per year, or $67.4 per hour.

Senior Software Engineer, Fullstack

Ai2

Seattle, WA • On-site

$139K - $183K/yr

Full-time

Re-posted 16 days ago

Job description

Job Summary:
Ai2 is a Seattle-based non-profit AI research institute focused on building breakthrough AI to solve significant global challenges. They are seeking a Senior Software Engineer, Fullstack to develop impactful AI-powered solutions by collaborating with UX designers, AI/ML experts, and research scientists to create seamless user interfaces and enhance scientific discovery.
Responsibilities:
• 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
Qualifications:
Required:
• 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
Company:
We are a Seattle-based non-profit AI research institute founded in 2014 by the late Paul Allen. Founded in 2014, the company is headquartered in Seattle, USA, with a team of 201-500 employees. The company is currently Growth Stage.

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