Software Engineer, DOM Core Job at Mozilla

Software Engineer, DOM Core

Join the global DOM: Core team of engineers passionate about the Web. We are the...

Location

Salary:

Not provided

Mozilla

Expiration Date

Until further notice

Requirements

Proficiency in and experience developing software in C++
Ability to learn a large and complex code base quickly
Comfortable contacting people and driving discussions
Motivated to learn new tools and techniques for improving existing software
Familiarity with one or more of the following, or ability to pick them up in a timely manner: Multi-process architecture
Debugging memory usage or performance profiling
The modern Web technologies (JavaScript, HTML, and/or CSS)
Commitment to our values: Welcoming differences
Being relationship-minded
Practicing responsible participation

Job Responsibility

Improve the DOM, HTML, editing, user interaction capabilities of our Web engine, with a focus on performance, Web compatibility, and standards correctness
Read and implement API specifications, as well as contributing to the standards process by raising issues or participating in discussions
Develop and debug in a multi-language, multi-threaded and multi-process code base
Work primarily in C++ and write tests largely with HTML and JavaScript. You will learn on the job!
Collaborate with a geographically distributed development team. Working in the open is the norm

What we offer

Generous performance-based bonus plans to all eligible employees - we share in our success as one team
Rich medical, dental, and vision coverage
Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
Quarterly all-company wellness days where everyone takes a pause together
Country specific holidays plus a day off for your birthday
One-time home office stipend
Annual professional development budget
Quarterly well-being stipend
Considerable paid parental leave
Employee referral bonus program

Front-End Developer

Front-End Developer Job Description

Location

Salary:

Not provided

Ryz Labs

Expiration Date

Until further notice

Requirements

A strong knowledge of modern React using TypeScript
Familiarity with modern Angular
A strong foundation in core web technologies (HTML, CSS, javascript with the DOM)
Ability to maintain and debug a large Single-Page Application
Ability to write unit tests as well as to structure code in a way that makes testing easier
Strong knowledge of version control systems (git)
Experience with Project management software (Jira, Linear, etc.) and the agile workflow

Job Responsibility

Collaborate with UI/UX designers, software engineers, data engineers, and data scientists to craft specialty web apps, APIs, and more
Work in several ecosystems, and there will always be an exciting new project or feature to develop

Staff Software Engineer

Xometry is seeking a Staff Software Engineer to join our Buyer Experience techno...

Location

United States , Waltham

Salary:

140000.00 - 230000.00 USD / Year

Cherry Ventures

Expiration Date

Until further notice

Requirements

At least 7 years of experience in software development, in a fast-paced, product-driven environment
Experience with a marketplace product is highly desired
Strong technical expertise in a full-stack environment
Familiar with: REST API design, The core of HTML, DOM, and CSS, Python
Expected to become proficient in Python, Rust, and React/Typescript design and development
Demonstrated ability to interact and communicate effectively with junior-level ICs all the way to technology, product, and business executives
Excellent leadership, execution, and communication skills

Job Responsibility

Hands-On Technical Leadership: writing and reviewing plans for new projects, and then participating in implementation with the team
Guide Innovation: Champion the adoption of a good mix of traditional and cutting-edge technologies and methods
Teaching & Mentorship: serve as a mentor and guide to engineers across the organization
Code Review: do code review and mentor others within the organization to perform good code reviews
Operational Excellence: Guarantee the delivery of superior software that not only meets but exceeds customer expectations
Collaborative Strategy: Forge strong partnerships with product managers, designers, and company leadership

What we offer

401(k) match
medical, dental and vision insurance
life and disability insurance
generous paid time off including vacation, sick leave, floating and fixed holidays, maternity and bonding leave
EAP, other wellbeing resources

Fulltime

Staff Software Engineer

Xometry is seeking a Staff Software Engineer to join our Buyer Experience techno...

Location

United States , North Bethesda

Salary:

140000.00 - 230000.00 USD / Year

Cherry Ventures

Expiration Date

Until further notice

Requirements

At least 7 years of experience in software development, in a fast-paced, product-driven environment
Experience with a marketplace product is highly desired
Strong technical expertise in a full-stack environment. You should be familiar with: REST API design, The core of HTML, DOM, and CSS. Python
You will be a part of full-stack teams and you are expected to become proficient in Python, Rust, and React/Typescript design and development
Demonstrated ability to interact and communicate effectively with junior-level ICs all the way to technology, product, and business executives
Excellent leadership, execution, and communication skills

Job Responsibility

Hands-On Technical Leadership: Your primary role is writing and reviewing plans for new projects, and then participating in implementation with the team
Guide Innovation: Champion the adoption of a good mix of traditional and cutting-edge technologies and methods. You have the experience to guide us out of “our way” of doing things when needed, and to double down on our existing tech and methods where appropriate
Teaching & Mentorship: You will serve as a mentor and guide to engineers across the organization, teaching and mentoring them to grow their skills
Code Review: You will do code review and mentor others within the organization to perform good code reviews
Operational Excellence: Guarantee the delivery of superior software that not only meets but exceeds customer expectations, while aligning with the strategic business timelines
Collaborative Strategy: Forge strong partnerships with product managers, designers, and company leadership to promote a culture of open communication, good collaboration, and high standards

What we offer

401(k) match
medical, dental and vision insurance
life and disability insurance
generous paid time off including vacation, sick leave, floating and fixed holidays, maternity and bonding leave
EAP, other wellbeing resources

Fulltime

Staff Software Engineer

Xometry is seeking a Staff Software Engineer to join our Buyer Experience techno...

Location

United States , Lexington

Salary:

Not provided

Cherry Ventures

Expiration Date

Until further notice

Requirements

At least 7 years of experience in software development, in a fast-paced, product-driven environment
Experience with a marketplace product is highly desired
Strong technical expertise in a full-stack environment. You should be familiar with: REST API design, The core of HTML, DOM, and CSS. Python
You will be a part of full-stack teams and you are expected to become proficient in Python, Rust, and React/Typescript design and development
Demonstrated ability to interact and communicate effectively with junior-level ICs all the way to technology, product, and business executives
Excellent leadership, execution, and communication skills

Job Responsibility

Hands-On Technical Leadership: Your primary role is writing and reviewing plans for new projects, and then participating in implementation with the team
Guide Innovation: Champion the adoption of a good mix of traditional and cutting-edge technologies and methods. You have the experience to guide us out of “our way” of doing things when needed, and to double down on our existing tech and methods where appropriate
Teaching & Mentorship: You will serve as a mentor and guide to engineers across the organization, teaching and mentoring them to grow their skills
Code Review: You will do code review and mentor others within the organization to perform good code reviews
Operational Excellence: Guarantee the delivery of superior software that not only meets but exceeds customer expectations, while aligning with the strategic business timelines
Collaborative Strategy: Forge strong partnerships with product managers, designers, and company leadership to promote a culture of open communication, good collaboration, and high standards

Staff Software Engineer, Frontend

You'll lead critical frontend initiatives as Gamma scales to serve hundreds of m...

Location

United States , San Francisco

Salary:

230000.00 - 310000.00 USD / Year

Gamma

Expiration Date

Until further notice

Requirements

8+ years of experience as a frontend software engineer with deep expertise in building production web applications
Strong understanding of modern JavaScript/TypeScript, ReactJS (with hooks), and asynchronous programming patterns
Deep knowledge of the browser DOM, React's virtual DOM, mutation observers, and event propagation
Experience with state management in React, preferably with Redux
Strong grasp of computer science fundamentals
Experience working in large, complex production-scale frontend codebases

Job Responsibility

Build and maintain the core foundations of our collaborative editor using CRDTs and WebSockets
Architect complex AI-powered features and workflows that integrate LLMs seamlessly into the user experience
Lead frontend performance optimization initiatives to ensure the app stays fast at scale
Design and implement sophisticated drag and drop interfaces for intuitive content manipulation
Contribute to and suggest improvements for open source projects at the core of our application
Create integrations with other platforms and build embedded applications
Mentor and guide other engineers

What we offer

competitive equity

Fulltime

Fullstack Engineer (FE Oriented) - Core Team

Coralogix is a modern, full-stack observability platform transforming how busine...

Location

Poland

Salary:

Not provided

Coralogix

Expiration Date

Until further notice

Requirements

4+ years of professional Software Development experience: Proven track record of building, deploying and maintaining production-grade applications
Expert-level Angular & State Management: 4+ years of deep hands-on experience with Angular (2+) and NgRx/Store. You should be comfortable architecting complex data flows and optimizing reactive patterns
Modern Web Ecosystem: Strong command of the "Web Fundamentals" - including TypeScript, advanced CSS/SCSS (Flexbox, Grid) and a deep understanding of browser APIs, performance optimization and DOM manipulation
Full-Stack Awareness: Working experience with Node.js (preferred) to collaborate effectively on API design and understand the end-to-end lifecycle of a request
SaaS at Scale: Experience building and supporting large-scale SaaS production services, with an understanding of multi-tenancy, high availability and performance monitoring

Job Responsibility

End-to-end development and ownership of our products and features, from design, provide a performance, scalable to production
Solving diverse complex problems of high scale
Collaborate with other Engineers and Product s to improve our products

Fulltime

Software Engineer Ⅱ - JavaScript

As a JavaScript Engineer, you will be required to work on various JavaScript lib...

Location

Salary:

Not provided

Wingify

Expiration Date

Until further notice

Requirements

1-3 years of relevant experience
Passion for writing Vanilla JavaScript
Strong knowledge and experience in JavaScript, HTML, CSS
Work Experience with TypeScript
Good understanding of the DOM, Browser Events, Javascript APIs, Canvas rendering, etc.
Good understanding of how the browsers work
Regard for optimizations that focus on delivering content to the user as quickly as possible
Awesome Debugging Skills
Passion to write automation tests
Understanding the similarities and differences across browsers (young and old)

Job Responsibility

Development of Core JavaScript libraries
Writing reusable code or modules that can be used across all the JavaScript libraries
Talking about your work - we love open source software, we heavily use them, and talking about how we use them is the least we can do to help the community

Fulltime

Software Engineer, DOM Core

Mozilla

Location:

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
January 08, 2026

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Job Description:

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Job Posted:January 08, 2026

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