Lead Frontend Developer (ReactJS) Job at Citi (Belfast)

Lead Frontend Developer (ReactJS), Assistant Vice President

We are seeking a talented and passionate Lead Frontend Developer with deep exper...

Location

United Kingdom , Belfast

Salary:

Not provided

Citi

Expiration Date

Until further notice

Requirements

Bachelor's or Master's degree in Computer Science, Software Engineering, or a related technical field
Professional experience in frontend web development, with at least 3 years in a lead or senior role focused on ReactJS
Expert-level proficiency in ReactJS, including a deep understanding of its core principles, component lifecycle, hooks, and state management libraries (e.g., Redux, Context API, Zustand)
Strong command of modern JavaScript (ES6+), HTML5, and CSS3, with experience in pre-processors (e.g., SASS, LESS) and styled-components or CSS-in-JS solutions
Demonstrable experience with frontend build tools (e.g., Webpack, Vite, Babel) and package managers (npm, yarn)
Proficiency in writing unit, integration, and end-to-end tests for frontend applications (e.g., Jest, React Testing Library, Cypress)
Solid understanding of responsive design principles and cross-browser compatibility issues
Experience with version control systems, particularly Git
Excellent problem-solving skills, strong analytical capabilities, and clear communication skills (verbal and written)

Job Responsibility

Lead the design, development, and implementation of complex, scalable, and responsive web applications using ReactJS and its ecosystem
Define and enforce frontend architectural patterns, coding standards, and best practices to ensure consistency, maintainability, and performance across all frontend projects
Provide technical leadership, mentorship, and guidance to a team of frontend developers, fostering their growth and ensuring high-quality code delivery
Collaborate closely with UX/UI designers, product managers, and backend engineers to translate wireframes and designs into pixel-perfect, highly functional user interfaces
Oversee and conduct thorough code reviews, ensuring adherence to quality, performance, security, and accessibility standards
Optimize application performance, identify and resolve frontend bottlenecks, and improve overall user experience
Drive the adoption of new technologies, tools, and methodologies to enhance our frontend development capabilities
Stay up-to-date with the latest trends and advancements in frontend development, ReactJS, and web technologies

Fulltime

Frontend Engineer - Customer Care Technology

Frontend engineers in Zalando's Customer Care product team build and maintain th...

Location

Germany , Berlin

Salary:

Not provided

Zalando Lounge

Expiration Date

Until further notice

Requirements

Expert-level knowledge of JavaScript, TypeScript, ReactJS, and associated frameworks
Experience with performance optimization, responsive design, and RESTful API integration
Familiarity with Webpack and other modern frontend development tools
Experience building and maintaining high-traffic applications, ideally in a B2C environment
Experience with modular design, reusable components/libraries, and potentially micro-frontends or design systems
Strong focus on user experience
Experience with frontend testing, CI/CD pipelines, and agile development methodologies
Strong communication and collaboration skills
At least 3+ years of experience in frontend development
Demonstrable experience building scalable, high-performance consumer-facing products

Job Responsibility

Develop and maintain scalable frontend systems for customer self-service tools, integrating with Salesforce Service Cloud
Build responsive web and mobile applications
Utilize technologies like AI and automation to enhance self-service capabilities
Work closely with other frontend engineers, AI specialists, Salesforce developers, and other stakeholders
Design and develop solutions that empower customers and provide a seamless experience
Improve existing self-service tools and automate processes to increase customer satisfaction and operational efficiency
Lead frontend architecture discussions and influence design systems
Participate in a dynamic and agile development process
Manage complex applications serving millions of users
Utilize skills in ReactJS, performance optimization, and modular component development

What we offer

Employee shares program
40% off fashion and beauty products sold and shipped by Zalando, 30% off Zalando Lounge, discounts from external partners
2 paid volunteering days a year
Hybrid working model with 60% remote per week
Work from abroad for up to 30 working days a year
27 days of vacation a year to start
Relocation assistance available (subject to prior agreement)
Family services, including counseling and support
Health and wellbeing options (including Gympass)
Mental health support and coaching are available

Fulltime

Senior Front End Engineer

Clinical Trial Media is looking for an experienced Senior Front End Engineer to ...

Location

United States , Hauppauge

Salary:

Not provided

Clinical Trial Media

Expiration Date

Until further notice

Requirements

6+ years of javascript frontend development experience (including css)
3+ years of typescript experience
3+ years of reactjs experience
Bachelor’s Degree in Computer Science or equivalent experience
Experience with git, pull requests, and code reviews (you should understand git rebase)
Experience with agile software development
Detail oriented and excellent time management
Ability to multi-task and work in a fast-paced environment while supporting multiple projects
Excellent written and verbal communication skills

Job Responsibility

Design and develop reactjs frontend components
Integrate REST api backend endpoints
Develop frontend dashboards and forms
Write css/sass for styling visual elements
Help us fix bugs and advise on best practices
Write secure testable code including unit tests
Integrate code with CI/CD pipelines
Work with team leads on requirements and communicate level-of-effort and timelines
Submit and review pull requests
Real-time video chat w/ team on a regular basis

Senior ReactJS Software Engineer

We are looking for a passionate and skilled Senior ReactJS Software Engineer to ...

Location

United States , Michigan

Salary:

Not provided

Miracle Software Systems

Expiration Date

Until further notice

Requirements

6–10 years of frontend development experience
at least 3+ years of strong hands-on ReactJS experience
deep understanding of Federated WebViews, Micro Frontend architecture, and modular frontend design patterns
expertise in modern ReactJS (hooks, context, functional components, etc.)
strong HTML5, CSS3, JavaScript (ES6+), and responsive design skills
familiarity with CI/CD workflows and cloud platforms (GCP preferred)
experience working in agile teams and comfort with pair programming

Job Responsibility

Lead the entire frontend development lifecycle using ReactJS — from architecture to deployment
design and implement high-performance, modular, and scalable UI components
take ownership of implementing Federated WebViews and manage integration strategies across micro frontends
act as a technical mentor and enable high-quality code practices through peer reviews and pair programming
collaborate effectively with backend teams (APIs built in Python) and DevOps for seamless deployments
work with design and UX teams to bring intuitive and accessible interfaces to life

Technical Architect

At AKQA we believe in the imaginative application of art and science to create b...

Location

India , Gurgaon

Salary:

Not provided

AKQA

Expiration Date

Until further notice

Requirements

2+ years of experience in an Architect Role
Expertise level knowledge of HTML5, CSS3 and ES6-Javascript
3+ years of experience in Typescript with 2+ years contemporary FE development frameworks such as ReactJS and NextJS
3+ years of experience in API development using NodeJS, AWS Lambda and GraphQL/REST API
2+ years of experience in managing DevOps for web applications on AWS/Azure
Expertise in creating new project code-base from scratch - including creating Webpack/Gulp build scripts, choosing relevant plugins and setting up CI/CD
Proficiency in creating Technical Design and Architecture of the web/mobile app, utilising the knowledge of design patterns and best practices
Experience in using CMS systems such as Contentful/Contentstack/Strapi as part of the technology solution
Experience in architecting integrations with SaaS solutions (Algolia etc.)
Proficiency in applying Performance, Accessibility and Security improvement techniques to elevate the customer experience

Job Responsibility

Work with our clients to conceptualise and architect digital experiences spanning across websites, ecommerce platforms and hybrid mobile apps
Lead a team of technologists to build, test and deploy the solution on cloud platforms and app stores
Enhance the user experience through the use of the latest Accessibility, Performance and Security improvement techniques

Fulltime

Staff Engineer – Full Stack Applications

GEICO is seeking an experienced Engineer with a passion for building high-perfor...

Location

United States , Chevy Chase

Salary:

110000.00 - 230000.00 USD / Year

Geico

Expiration Date

Until further notice

Requirements

Extensive experience in leading and building full-stack web applications, with a strong focus on front-end technologies like React, Typescript, Bootstrap and Django-based backends
Proven expertise in designing and developing microservices using Golang, Java, Python, Django, gRPC with protocol buffers, Kafka and Apache Spark with a deep understanding of both API and event-driven architectures
Strong background in leading UI development efforts, particularly with JavaScript based frameworks ensuring a seamless user experience
Experience leading web application development using micro-frontend architecture with client-side composition methods
Experience leading the integration of micro-frontend applications with a large single page application
Experience building architecture, design patterns, reliability, security and scaling of new and existing web applications
Expertise leading and contributing to event driven microservices using Kafka and Apache spark
Expertise in data model design on relational databases like PostgreSQL and No-SQL databases like Cassandra, MongoDB
Understanding of existing monitoring concepts and tooling
Understanding of DevOps Concepts and Cloud Architecture

Job Responsibility

Provide technical and thought leadership across multiple layers of the stack, focusing on fullstack web application development and ensuring the integration of UI, microservices and backend systems
Work closely with product leaders, other engineers and partner teams to understand product requirements, build a technical backlog, and develop solutions that align with product vision
Lead the development of UI using React, Typescript and Bootstrap on a Django framework while also contributing to the Architecture and development of microservices using Golang, Python, Django and Kafka
Design and implement loosely coupled, scalable microservices
Own and drive one to two service areas, being accountable for their successful delivery, from requirement analysus, design through to production, and ensuring they meet performance, scalability and reliability standards
Act as a role model and mentor to senior and junior engineers, guiding them in understanding the architecture, design and implementation of systems
Maintain excellent communication with Parter teams and leads, articulating technical implementations for various stakeholders, ensuring alignment across teams
Proactively explore unknown product requirements and design solutions that meet evolving needs, contributing to the continuous improvement of our platform
Leverage your experience in deploying wen applications in Kubernetes (k8s) environments, ensuring reliable interaction with backend services and seamless integration with cloud and on-premises systems

What we offer

Comprehensive Total Rewards program that offers personalized coverage tailor-made for you and your family’s overall well-being
Financial benefits including market-competitive compensation
a 401K savings plan vested from day one that offers a 6% match
performance and recognition-based incentives
and tuition assistance
Access to additional benefits like mental healthcare as well as fertility and adoption assistance
Supports flexibility- We provide workplace flexibility as well as our GEICO Flex program, which offers the ability to work from anywhere in the US for up to four weeks per year

Fulltime

Staff Engineer – Full Stack Applications FinOps

GEICO is seeking an experienced Engineer with a passion for building high-perfor...

Location

United States , Chevy Chase, MD; Palo Alto, CA; Dallas, TX; Seattle, WA

Salary:

110000.00 - 230000.00 USD / Year

Geico

Expiration Date

Until further notice

Requirements

Extensive experience in leading and building full-stack web applications, with a strong focus on front-end technologies like React, Typescript, Bootstrap) and Django-based backends
Proven expertise in designing and developing micro-services using Golang,Java,Python,Django,gRPC with protocol buffers, Kafka and Apache Spark with a deep understanding of both API and event-driven architectures
Strong background in leading UI development efforts, particularly with JavaScript based frameworks ensuring a seamless user experience
Experience leading web application development using micro-frontend architecture with client-side composition methods
Experience leading the integration of micro-frontend applications with a large single page application
Experience building architecture, design patterns, reliability, security and scaling of new and existing web applications
Expertise leading and contributing to event driven microservices using Kafka and Apache spark
Expertise in data model design on relational databases like PostgreSQL and No-SQL databases like Cassandra, MongoDB
Understanding of existing monitoring concepts and tooling
Understanding of DevOps Concepts and Cloud Architecture

Job Responsibility

Provide technical and thought leadership across multiple layers of the stack, focusing on full-stack web application development and ensuring the integration of UI, micro-services, and backend systems
Work closely with product leaders, other engineers and partner teams to understand product requirements, build a technical backlog, and develop solutions that align with product vision
Lead the development of UI using React, Typescript and Bootstrap on a Django framework while also contributing to the Architecture and development of microservices using Golang, Python, Django and Kafka
Design and implement loosely coupled, scalable micro-services
Own and drive one to two service areas, being accountable for their successful delivery, from requirement analysis, design through to production, and ensuring they meet performance, scalability and reliability standards
Act as a role model and mentor to senior and junior engineers, guiding them in understanding the architecture, design and implementation of systems
Maintain excellent communication with Parter teams and leads, articulating technical implementations for various stakeholders, ensuring alignment across teams
Proactively explore unknown product requirements and design solutions that meet evolving needs, contributing to the continuous improvement of our platform
Leverage your experience in deploying wen applications in Kubernetes (k8s) environments, ensuring reliable interaction with backend services and seamless integration with cloud and on-premises systems

What we offer

Comprehensive Total Rewards program that offers personalized coverage tailor-made for you and your family’s overall well-being
Financial benefits including market-competitive compensation
a 401K savings plan vested from day one that offers a 6% match
performance and recognition-based incentives
and tuition assistance
Access to additional benefits like mental healthcare as well as fertility and adoption assistance
Supports flexibility- We provide workplace flexibility as well as our GEICO Flex program, which offers the ability to work from anywhere in the US for up to four weeks per year

Fulltime

Senior React JS Developer

We’re looking for a Senior ReactJS Developer with exceptional TypeScript experti...

Location

India

Salary:

Not provided

Talentica

Expiration Date

Until further notice

Requirements

BE/BTech in Computer Science or a related field from a top institute (like IIT, NIT, BITS, etc.)
6+ years of professional front-end experience
Exceptional proficiency in TypeScript
In-depth knowledge of front-end technologies including HTML5, CSS3, and JavaScript
Extensive experience with state management libraries like Redux or Context API
Proficiency in modern front-end build tools such as Webpack or Parcel
Strong familiarity with RESTful APIs and asynchronous JavaScript
Expertise in cross-browser compatibility and responsive design
Extensive experience with version control systems, preferably Git
Outstanding problem-solving and debugging skills

Job Responsibility

Lead the design, development, and maintenance of complex user interfaces using ReactJS, with a focus on code reusability, scalability, and performance optimization
Leverage TypeScript to its full potential for enhancing code quality, maintainability, and overall development efficiency
Drive the architectural decisions and ensure adherence to best practices for scalable and maintainable front-end solutions
Define and implement advanced UI components and modules, promoting a highly modular and reusable codebase
Provide guidance and expertise in managing application state using advanced techniques and libraries like Redux or Context API
Collaborate seamlessly with backend developers to integrate APIs, ensuring seamless communication between the front-end and back-end systems
Lead the creation of robust unit tests and conduct rigorous debugging to guarantee the reliability and stability of the application
Conduct thorough code reviews, mentor junior developers, and champion a culture of continuous learning and improvement
Ensure the application functions consistently and optimally across various browsers and devices
Implement advanced optimization techniques to enhance the application's speed, responsiveness, and overall performance

What we offer

A culture of innovation
Endless learning opportunities
Talented peers
Work-life balance
Flexible schedules
Remote work options
A great culture
Recognition & rewards

Lead Frontend Developer (ReactJS)

Citi

Location:
United Kingdom , Belfast

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:
March 21, 2026

Looking for more opportunities? Search for other job offers that match your skills and interests.

Similar Jobs for Lead Frontend Developer (ReactJS)

Lead Frontend Developer (ReactJS), Assistant Vice President