End developer html5, css, javascript Work, Jobs in Field Based (with Salaries)

Senior Platform Engineer, WebExtensions
Mozilla —Remote
- £66,000 - £87,000 a year
- Remote
- C++
- JavaScript
- Software development
- Employee assistance programme
- Referral programme
Junior Business Software Engineer
SECOM PLC —Remote
- Full-time
- Remote
- SQL
- JavaScript
- APIs
- Employee discount
Quick apply
6d
Senior Software Engineer
GitHub, Inc. —Remote
- £76,900 - £142,900 a year
- Full-time
- Remote
- Doctoral degree
- Computer Science
- Engineering
Digital and Technology Solutions Professional Apprenticeship Level 6
Amentum —Remote
- Full-time
- Hybrid work
- Computer Science
- Analysis skills
- Computer skills
20h
Senior Software Engineer - Engineering Workflow and CI
Mozilla —Remote
- £65,000 - £87,000 a year
- Remote
- Data analysis skills
- SQL
- AWS
- Employee assistance programme
- Referral programme
Senior PHP Web Developer with a “Can Do” Attitude – Pakistan
MKSK Consulting —Remote
- £400,000 - £720,000 a year
- Full-time
- Remote
- English
- SQL
- JavaScript
Solutions Engineer - UK Remote
Embrace —Remote
- £130,000 - £160,000 a year
- Remote
- Java
- JavaScript
- Travel
Principal Software Engineering Manager
GitHub, Inc. —Remote
- £111,500 - £207,100 a year
- Full-time
- Remote
- Management
- Doctoral degree
- Computer Science
Cloud Engineer
Simply Commerce Group Ltd —Remote
- Up to £75,000 a year
- Remote
- AWS
- JavaScript
- APIs
- Annual leave
Senior Software Engineer
Vladimer Avdalov Technologies Ltd —Remote
- £65,000 - £110,000 a year
- Full-time
- Remote
- English
- AWS
- Bachelor's degree
- Work from home
Quick apply
12d
Head of Development – Tebex
Overwolf —Remote
- Full-time
- Remote
- Mentoring
- AI
- Communication skills
Quick apply
Marketing Automation Specialist
Gallagher —Remote
- Remote
- CRM software
- Bachelor's degree
- Communication skills
Technical Architect - Shopify
Simply Commerce Group Ltd —Remote
- £65,000 - £75,000 a year
- Remote
- JavaScript
- Travel
- APIs
- Annual leave
Staff Software Engineer, Traffic Team
GitHub, Inc. —Remote
- £93,000 - £172,800 a year
- Full-time
- Remote
- Azure
- Doctoral degree
- Computer Science
Snr/Lead Fullstack Engineer
Simply Commerce Group Ltd —Remote
- Up to £100,000 a year
- Remote
- Azure
- English
- AWS
Gen AI Workflow Designer
BRAHMA —Remote
- Remote
- JavaScript
- Python
Senior/Staff Design Engineer
AlphaSense —Remote
- Remote
- Computer Science
- Bachelor's degree
- JavaScript
Application Architect, Medical Imaging
Perceptive —Remote
- Full-time
- Remote
- Doctoral degree
- Computer Science
- DevOps
Senior Consulting Software Developer
Harris Computer Systems —Remote
- £325 a day
- Full-time
- Hybrid work
- Windows
- Java
- SQL
- Annual leave
1d
DevOps / Backend Engineer @SPARQ
NeuralAI —Remote
- £50,000 - £90,000 a year
- Full-time
- Remote
- AWS
- APIs
- AI
Quick apply

I want to receive the latest job alerts for end developer html5, css, javascript in field based

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

Explore jobs in more locations

end developer html5, css, javascript jobs near field based

Senior Platform Engineer, WebExtensions

Mozilla -
Remote

Apply Now

Job details

£66,000 - £87,000 a year

Benefits

Employee assistance programme
Referral programme

Qualifications

Rust (programming language)
CSS
C++
C
JavaScript
Software development
GitHub
APIs
Communication skills
Debugging
HTML

Full 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:

The WebExtensions platform powers the add-ons ecosystem in Firefox, enabling millions of users to customize their browser while keeping safety and performance at the forefront. As a WebExtensions Engineer, you will help implement new extension capabilities, improve existing APIs, and ensure that extensions remain reliable across Firefox.

As a Software Engineer on the WebExtensions team, you’ll bring a passion for exploring complex systems and creating experiences that balance developer power with user trust. You’ll work deep in the Gecko platform to evolve extension capabilities, and you’ll build UI features in Firefox that make extensions clear and manageable for users. Along the way, you’ll collaborate with experts across Mozilla and help advance cross-browser compatibility and the path toward standardization. Your work will keep extensions safe, powerful, and reliable for developers and millions of Firefox users.

What you’ll do:

Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox.
Debug and fix issues affecting extensions in Firefox.
Collaborate with product managers, QA, and the AMO engineering team to deliver features end-to-end.
Contribute to Mozilla-owned extensions and system add-ons.
Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub.
Support extension developers by helping diagnose issues and improving tooling/documentation.

What you’ll bring:

4+ years of professional experience in software development.
Strong proficiency in JavaScript, DOM APIs, HTML, and CSS.
Familiarity with modern browser architecture and debugging tools.
Experience with API design and integration.
Ability to navigate and learn from large codebases.
Strong communication skills and experience collaborating in distributed teams.

- Experience with Firefox internals, C++ or Rust.
- Familiarity with Android or GeckoView development.
- Knowledge of web security principles.
- Contributions to open source projects, especially in browser or extension development.

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 [email protected] 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: D

#LI-REMOTE

Req ID: R3020

Hiring Ranges:

Remote UK

£66,000 - £87,000 GBP

Apply Now

Refine Your Search

end developer html5, css, javascript jobs in field based

Senior Platform Engineer, WebExtensions

Junior Business Software Engineer

Senior Software Engineer

Digital and Technology Solutions Professional Apprenticeship Level 6

Senior Software Engineer - Engineering Workflow and CI

Senior PHP Web Developer with a “Can Do” Attitude – Pakistan

Solutions Engineer - UK Remote

Principal Software Engineering Manager

Cloud Engineer

Senior Software Engineer

Head of Development – Tebex

Marketing Automation Specialist

Technical Architect - Shopify

Staff Software Engineer, Traffic Team

Snr/Lead Fullstack Engineer

Gen AI Workflow Designer

Senior/Staff Design Engineer

Application Architect, Medical Imaging

Senior Consulting Software Developer

DevOps / Backend Engineer @SPARQ

I want to receive the latest job alerts for end developer html5, css, javascript in field based

Related Searches

Explore jobs in more locations

Jobseeker tools

Employer Tools

Browse

Stay Connected