Jobs in the United States

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Added 1 min ago
Director, Product Management (Media)
Cars.com LLC
Remote, United States
…team of product managers. You will define the strategy and lead innovation for your product suite; hire, develop, and coach your team of PMs; and define effective strategies for product…
Added 4 mins ago
Controls Design Engineer, Controls Design Engineering
Amazon Data Services, Inc.
Seattle, WA
AWS Infrastructure Services owns the design, planning, delivery, and operation of all AWS global infrastructure. In other words, we’re the people who keep the cloud running. We support all…
Added 8 mins ago
IG
Senior Platform Engineer Microsoft
Insight Global
Remote, United States
- From $57 USD / hour
…deployment, endpoint compliance, and cloud patch management. The engineer will lead efforts to modernize endpoint management toward cloud-first and co-managed solutions, improve application…
Added 12 mins ago
Roadway Senior Project Manager
HNTB Corporation
Raleigh, NC
…NCDOT. We are dedicated to enhancing our communities, solving infrastructure challenges for our client and increasing transit and pedestrian/bicycle…
Added 12 mins ago
Building Envelope Consultant
UES
Pineville, NC
…materials testing and inspection, we help deliver critical infrastructure and development projects across the…
Added 12 mins ago
Lead Identity System Engineer
Sanford
Marshfield, WI · Sioux Falls, SD · Bemidji, MN · Bismarck, ND · Fargo, ND
8 Hours - Day Shifts (United States of America)
Added 13 mins ago
Senior Software Engineer - Data Enablement
Block
Bay Area, CA
…Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more - provide support and guidance at the corporate level. They work across business groups and…
Added 16 mins ago
Lead Information Security Engineer - Cyber Defense
Fifth Third Bank, National Association
United States
The Lead Information Security Engineer (ISE) will help lead our software, platform, and site reliability engineering work with the detection, response, and threat intel analysts to build,…
Added 16 mins ago
Director, Software Engineering
Fifth Third Bank, National Association
Cincinnati, OH
Engineer for high-volume digital channels: Lead technologies that support high transaction volumes, demanding availability requirements, complex commercial client structures, and changing…
Added 19 mins ago
Enterprise Data Cybersecurity Engineer, Lead
Booz Allen Hamilton_United States
McLean, VA
Enterprise Data Cybersecurity Engineer, LeadThe Opportunity:
Added 19 mins ago
Systems Engineer, Lead
Booz Allen Hamilton_United States
Fayetteville, NC
…contributions to modernization initiatives, including automation, infrastructure as code, and containerized environments. This role requires an experienced systems engineer who can lead by…
Added 20 mins ago
Senior Structural Engineer – Substation
E2 Consulting Engineers, LP
Pasadena, CA
Perform careful self-checking activities to ensure the quality of work before it is presented to Lead Engineer for review.
Added 21 mins ago
Senior Systems Engineer
Freestone Capital Management
Seattle, WA
We are seeking a Senior Systems Engineer to own the infrastructure that keeps our multi-office firm of over 130 people secure, connected, and productive. This person will be the technical…
Added 22 mins ago
Staff Software Engineer, Fraud & Payment Risk Platform
Flex
NY
Flex is looking for a Staff Software Engineer to build and scale our Fraud and Payment Risk Platform. You will lead the architecture and hands-on development of backend services and shared…
Added 24 mins ago
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Principal Software Engineer, Core Infrastructure
Oracle
Nashville, TN
- $114,600 to $234,600 USD / year
You will be responsible for ensuring that our cloud infrastructure solutions are designed and built with the highest level of scalability in mind. You will partner with other development…
Added 27 mins ago
Senior Software Lab Readiness and Integration Engineer
The Boeing Company
Berkeley, MO
The Boeing Company is currently seeking a Senior Software Lab Readiness and Integration Engineer to support the A-MH program located in Berkeley, MO. This position provides senior technical…
Added 30 mins ago
Full Stack Software Engineer
Ever.green
Remote, United States
You will be the second engineer on a small product team building out Ever.green’s REC management platform. You’ll collaborate closely with design and product counterparts to prioritize,…
Added 31 mins ago
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M&A Security Integration Engineer - PMTS
Salesforce, Inc.
CA · NY · WA · VA
- $197,300 to $344,700 USD / year
Perform comprehensive infrastructure assessments on acquired environments.
Added 31 mins ago
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Software Engineering PMTS
Salesforce, Inc.
NY
- $197,300 to $344,700 USD / year
We are looking for an engineer who has deep expertise within Google's Chromium project, who is eager to lead cross functional efforts to uphold Slack security, performance, and stability…
Added 31 mins ago
Senior SRE Engineer - San Francisco
Plaud
San Francisco, CA
Plaud is building the next generation intelligence infrastructure and interfaces to capture, extract, and utilize intelligence from what people say, hear, see, and think.
Added 36 mins ago
Data Engineer
Kanbrick
Remote, United States
Lead the creation of production-grade infrastructure. Develop reliable, documented, and stable technology to run reporting and decisions against.
Added 36 mins ago
Staff Software Engineer, Browser (New Products)
Mozilla
Remote, United States
…and implementation, working closely with the team’s technical…
Added 37 mins ago
SO
Engineering Associate (PCN 251807)
State of Alaska
Nome, AK
- $60.95 USD / hour
…complex construction contracts, manage project budgets, and lead project teams including Engineering Assistants and Technicians. Coordinate with design staff, other agencies, and…
Added 38 mins ago
Software Dev Engineer-III, Route 53 Resolver
Amazon Development Center U.S., Inc.
Seattle, WA · Herndon, VA
AWS Infrastructure Services owns the design, planning, delivery, and operation of all AWS global infrastructure. In other words, we’re the people who keep the cloud running. We support all…
Added 38 mins ago
Sr. Mechanical Design Engineer, Data Center Design Engineering
Amazon Data Services, Inc.
Austin, TX · Seattle, WA · Herndon, VA
AWS Infrastructure Services owns the design, planning, delivery, and operation of all AWS global infrastructure. In other words, we’re the people who keep the cloud running. We support all…

Mozilla

Staff Software Engineer, Browser (New Products)

Remote, United States

Apply on job-boards.greenhouse.io About employer

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Job details

Posting language: English
Posted: Nov 10, 2026

Original job description

Why Mozilla?

Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people.

The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders - only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.

About this team and role

Mozilla is seeking experienced browser engineers to join a small team exploring new applications of browser technology. The work combines deep systems engineering, rapid experimentation, and close collaboration across technical disciplines.

We are looking for a browser engine specialist who enjoys turning difficult systems questions into working experiments. You will investigate browser behavior, implement changes deep in the engine, and establish which ideas produce meaningful improvements. This is a hands-on individual contributor role with ownership of engine-level investigations and implementation, working closely with the team’s technical lead.

The work suits someone who has built or substantially changed browser internals, understands the tradeoffs embedded in those systems, and enjoys applying that knowledge to unfamiliar problems. Your experiments will help inform technical direction.

What you'll do:

Design and implement experiments within browser engine subsystems. Investigate how internal data structures and execution behavior affect performance, correctness, and the interfaces exposed to developer tools.
Evaluate ways to represent and expose browser state efficiently and accurately. Identify the tradeoffs in each approach, including information loss, implementation complexity, and compatibility with dynamic web content.
Prototype engine capabilities that support reliable programmatic interaction with web content. Investigate how document structure, layout, navigation, and event handling affect correctness and performance.
Instrument browser behavior and evaluate changes against repeatable tasks. Measure performance and correctness, isolate the effect of each change, and document unsuccessful experiments as clearly as successful ones. Check that gains hold beyond the workloads used to develop the prototype.
Profile the overhead introduced by new capabilities and pursue improvements where measurements justify them. Use AI tools to accelerate coding and analysis, and verify their output through debugging, tests, and measurement.

What you'll bring:

Deep hands-on expertise in at least one browser engine subsystem, such as DOM and Web APIs, layout and rendering, accessibility, JavaScript runtimes, or networking and process architecture. You have implemented substantial changes and can trace their effects into neighboring subsystems.
Strong proficiency in C++ or Rust, experience navigating a large systems codebase, and practical knowledge of memory ownership, concurrency, object lifetimes, and performance debugging. You can build the JavaScript and scripting tools needed to exercise and measure your work.
A demonstrated ability to investigate unfamiliar code, form a precise hypothesis, construct a useful prototype, and interpret the results. You can separate the effects of your implementation from variability in websites, workloads, or model behavior.
A strong understanding of web platform behavior and compatibility. You can reason about how document structure, script execution, rendering, and user interaction relate, including cases where the browser’s internal state is difficult to expose accurately to another system.
Experience with profiling, tracing, regression tests, or conformance tests, and a habit of grounding performance claims in reproducible evidence. You can explain both the benefit of an optimization and the circumstances in which it fails.
Curiosity about AI agents and a willingness to work directly with agent harnesses and coding tools. You can connect a low-level implementation choice to the information an agent receives and the work it must do next.

Nice to have:

Contributions to Gecko, Servo, Blink, WebKit, or another browser engine
Experience maintaining an open-source project
Technical leadership in a small team building a new product
Experience with accessibility infrastructure, browser security, profiling, or automated evaluation of agent workflows

What you’ll get:

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
Other benefits (life/AD&D, disability, EAP, etc. - varies by country)

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity, equity, inclusion, and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Group: C

Req ID: R3221

Hiring Ranges:

US Tier 1 Locations

$163,000 - $217,000 USD

US Tier 2 Locations

$150,000 - $200,000 USD

US Tier 3 Locations

$138,000 - $185,000 USD

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Jobs in the United States