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Web Application Engineer Jobs in Seattle, WA (NOW HIRING)

Sonsoft Inc

UI Mobile Web Developer

Bothell, WA · On-site

$56 - $72.75/hr

At least 2 years experience in Production support and performance engineering. At least 1 year of ... Page Application development At least 1 year of experience in Mobile web application on cross ...

Walmart

Senior, Software Engineer - Web/OL

Bellevue, WA · On-site

$108K - $216K/yr

Prioritize application quality, respond swiftly to feedback, improve performance, and address ... Engineering Excellence: Focus on meticulous, detail-oriented work, conduct rigorous code reviews ...

DevSelect

Senior DevOps Engineer

Seattle, WA · On-site +1

$147K - $190K/yr

... Engineer Location: Seattle, WA Openings: 1 Type: Full Time Hire The CLIENT is searching for an ... Experience in deploying web application and services in AWS and Heroku * Experience in deploying ...

Dellfor Technologies

senior .net developer

Redmond, WA

$61.50 - $78.50/hr

As a full stack engineer your contribution will have a direct impact on our customer experience and ... Recent 1+ years of developing web application in open source stack (MEAN, MERN) * 2+ years of ...

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Showing results 21-40

All JobsWeb Application Engineer JobsWeb Application Engineer Jobs in Seattle, WA

Web Application Engineer information

See Seattle, WA salary details

$57.5K

$126K

$173K

How much do web application engineer jobs pay per year?

As of Aug 20, 2026, the average yearly pay for web application engineer in Seattle, WA is $125,978.00, according to ZipRecruiter salary data. Most workers in this role earn between $95,600.00 and $153,600.00 per year, depending on experience, location, and employer.

What is a web application engineer?

Web Application Engineers are professionals who design, develop, and maintain web-based software applications. They work with programming languages like JavaScript, HTML, and CSS, and often use frameworks such as React, Angular, or Vue.js for the front end, and Node.js, Python, or Ruby on the back end. Their responsibilities include building user interfaces, integrating APIs, ensuring application security, and optimizing performance. Web Application Engineers collaborate with designers, product managers, and other developers to deliver robust and scalable web solutions. They play a crucial role in bringing interactive and dynamic websites and web apps to life.

What are the key skills and qualifications needed to thrive as a web application engineer?

To thrive as a Web Application Engineer, you need strong programming skills in languages like JavaScript, HTML, CSS, and frameworks such as React or Angular, usually supported by a relevant degree or experience. Familiarity with version control systems like Git, cloud platforms (e.g., AWS, Azure), and continuous integration tools is typically required. Problem-solving, teamwork, and effective communication are essential soft skills for collaborating and addressing complex technical challenges. These skills ensure the development of robust, scalable, and user-friendly web applications that meet business and user needs.

How does a web application engineer typically collaborate with designers and backend developers during a project?

Web Application Engineers work closely with both designers and backend developers to ensure seamless user experiences and functional applications. They translate design mockups into interactive web interfaces, often providing feedback to designers about feasibility and performance considerations. Collaboration with backend developers is essential for integrating APIs and data services, troubleshooting issues, and optimizing application performance. Effective communication and teamwork are crucial, as these roles often work together in agile sprints or regular stand-up meetings to align on project goals and address challenges promptly.

What is the difference between Web Application Engineer vs Software Developer?

AspectWeb Application EngineerSoftware Developer
CredentialsBachelor's in CS or related field, sometimes certifications in web technologiesBachelor's in CS or related field, certifications vary
Work EnvironmentDevelops, tests, and maintains web applications, often in teamsDesigns and codes software solutions, may work on various platforms
Industry UsagePrimarily in tech, e-commerce, and online servicesAcross all industries including finance, healthcare, and gaming
Search & Comparison IntentFocus on web-specific skills and frameworksBroader software development skills

Web Application Engineers specialize in building and maintaining web-based applications, focusing on web technologies and frameworks. Software Developers have a broader scope, working on various types of software beyond just web applications. While both roles require similar educational backgrounds, Web Application Engineers often have expertise in web-specific tools, making them more specialized for online platforms.

What cities near Seattle, WA are hiring for Web Application Engineer jobs?

Cities near Seattle, WA with the most Web Application Engineer job openings:

Web Application Engineer jobs near you
Infographic showing various Web Application Engineer job openings in Seattle, WA as of August 2026, with employment types broken down into 74% Full Time, 21% Part Time, and 5% Contract. Highlights an 92% Physical, 2% Hybrid, and 6% Remote job distribution, with an average salary of $125,976 per year, or $60.6 per hour.

Software Development Engineer, Kiro Web

Amazon

Seattle, WA

Full-time

Posted 15 days ago

Amazon rating

7.4

Company rating: 7.4 out of 10

Based on 7,098 frontline employees who took The Breakroom Quiz

6th of 39 rated national retailers

Job description

The future of software development is agentic. AWS is building Kiro - a frontier AI-powered development environment that autonomously tackles development tasks, maintains context across interactions, and continuously learns from its work. Kiro is already transforming how developers build and maintain software, and we're just getting started.
We're looking for a Software Development Engineer to build the server-side systems that power Kiro Web - a local web application that manages multiple AI agent sessions through the Agent Client Protocol (ACP)

You'll own the backend that spawns, orchestrates, and communicates with kiro-cli processes, handling JSON-RPC 2.0 messaging over stdin/stdout, WebSocket fan-out to connected browsers, and the REST APIs that enable multi-agent team coordination.
The challenges are systems-level and novel: managing a pool of AI agent child processes with independent lifecycles, building a WebSocket gateway that multiplexes real-time notifications from dozens of concurrent sessions, implementing tool approval interception and relay, and designing the inter-agent communication layer that lets orchestrator agents delegate work to specialized agents via REST. You'll also build the distribution infrastructure that delivers Kiro to millions of developers - multi-platform builds, CDN-backed metadata services, and update delivery mechanisms.
Your impact spans both the local development experience and global distribution. Every developer managing AI sessions through the Kiro Web UI depends on your server layer

Every developer downloading Kiro for the first time uses your distribution systems.
This is your chance to build the engine behind the agent that builds the future.
Key job responsibilities
- Build and maintain the Kiro Web server (Fastify/Node.js/TypeScript) - session manager, ACP client adapter, WebSocket gateway, and REST API
- Implement the process-per-session architecture: spawning kiro-cli ACP child processes, managing JSON-RPC 2.0 communication over stdin/stdout, and handling lifecycle events (crash recovery, session resume, stale PID handling)
- Build the multi-agent team orchestration layer - team session lifecycle, inter-agent prompt routing with topology validation, parallel dispatch, and skill injection
- Design and implement the WebSocket fan-out system that multiplexes notifications from multiple ACP processes onto browser clients, tagged by session/team/role
- Build and operate Kiro's multi-platform distribution system - metadata services, platform detection, CDN configuration (CloudFront), custom channel authorization, and release automation
- Implement tool approval interception: hold execution when agents request permissions, emit approval requests to the frontend, and relay user decisions back to the agent
- Write comprehensive tests, build monitoring/alerting, and participate in on-call rotations
- Contribute to API design, architecture reviews, and team technical direction
About the team
Kiro Web builds the web-based experiences and platform services for Kiro. Our server layer is the bridge between browser UIs and kiro-cli's Agent Client Protocol - we spawn and manage AI agent processes, multiplex their real-time output to the browser via WebSocket, and orchestrate multi-agent teams through REST APIs. We also own the distribution platform that delivers Kiro builds worldwide via CloudFront

Tech stack: TypeScript, Node.js 22, Fastify, WebSockets, JSON-RPC 2.0, pnpm monorepo. The team is between Seattle and Portland, shipping weekly.

What Amazon employees say

Pay

Benefits

Hours and flexibility

Workplace

Get the full story on Breakroom

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About Amazon

Sourced by ZipRecruiter

Amazon.com, Inc., commonly known as Amazon, is an American multinational technology company. It was founded by Jeff Bezos in 1994 and initially started as an online marketplace for books. Since then, Amazon has expanded its operations and become one of the largest e-commerce companies in the world. Amazon's primary business is its online retail platform, where customers can purchase a vast array of products, including electronics, clothing, books, home goods, and much more. The company offers a convenient and user-friendly shopping experience, with features such as fast shipping, customer reviews, and personalized recommendations. In addition to its e-commerce platform, Amazon has diversified its business into various other areas. One of its notable ventures is Amazon Web Services (AWS), a comprehensive cloud computing platform that provides services such as storage, compute power, and database management to individuals and businesses. AWS has become a leader in the cloud computing industry, powering many websites and applications worldwide. Amazon has also developed its own consumer electronics, including the popular Amazon Kindle e-reader, Fire tablets, Fire TV streaming devices, and the Alexa-powered Echo smart speakers. The Alexa voice assistant, integrated into these devices, allows users to interact with their devices using voice commands, perform tasks, and access information. Furthermore, Amazon has expanded into media and entertainment. It operates Prime Video, a streaming service that offers a wide range of movies, TV shows, and original content. Amazon Music provides a platform for streaming and purchasing digital music, while Audible offers audiobooks and other audio content. The company's commitment to customer satisfaction and convenience is demonstrated by its membership program, Amazon Prime. Prime members receive various benefits, including free two-day shipping, access to streaming services, exclusive deals, and more.

Industry

It services, book publishers, retail, real estate, computer and electronic product manufacturing and software development

Company size

10,000+ Employees

Headquarters location

Seattle, WA, US

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