Senior Web Developer (JavaScript / React)

Overview

Connecting clients to markets – and talent to opportunity.With 4,500+ employees and over 300,000 commercial, institutional, payments, and retail clients, we operate from more than 70 offices spread across six continents. As a Fortune 100, Nasdaq-listed provider, we connect clients to the global markets – focusing on innovation, human connection, and providing world-class products and services to all types of investors.Whether you want to forge a career connecting our retail clients to potential trading opportunities, or ingrain yourself in the world of institutional investing, StoneX Group is made up of four business segments that offer endless potential for progression and growth.

Responsibilities

Position Purpose: We are looking for a Sr. Web Developer to join our Websites Development team.  The Websites Development team is responsible for the client facing marketing websites. You will be working as part of a scrum team, focused on high quality deliverables to meet the business requirements for front end development. We need a developer who can help maintain legacy software, while working on migration to new system(s), being able to multitask and be flexible in the day to day tasks is a must.

Primary duties will include:

• You will work in a scrum teams located in Kraków, Bangalorem, London, and several citites across the United States 
• You will work closely with the marketing team to identify new enhancements to the site, and then see those enhancements through to completion; work on maintaining and improving our existing Marketing Websites.
• You will work closely with the design team to build out new modules, as well as update existing modules for use in new brands.
• We build our platform with quality in mind so you will work closely with QA to ensure that all changes are properly understood, testable, and automated where it is sensible.
• You will also work to ensure that the site components are performant against modern benchmarks such as Core Web Vitals.
• You will handle a change from start to finish and ensure the delivered solution is of high quality and in line with company development practices, troubleshooting complex issues and provide time sensitive solutions.
• Active role in the entire sprint process from estimation and design to feature rollout and you will work with and pair with other members of the team of all disciplines, BA, QA and other developers.
• You will be expected to maintain a high level of conduct, ethical standards and values as well as maintain an appropriate level of competence through ongoing training, making requests for updates or development as required.

Qualifications

To land this role you will need:

• 5-7 years of experience in web application development.
• Strong proficiency in Next.js, React, and TypeScript.
• Expertise in HTML5, JavaScript (ES6+), CSS, and one of the following pre-processors: SCSS, SASS, LESS (CSS preprocessors).
• Experience working with Bootstrap or Tailwind CSS (Utility-first CSS framework).
• Experience working with RESTful APIs and third-party integrations.
• Proficiency with Git (Bitbucket or GitHub) and CI/CD workflows/actions.
• Experience with unit testing frameworks (e.g., Jest, React Testing Library).
• Familiarity with Storybook for UI component development.
• Experience working in a monorepo environment.
• Familiarity with build tools like Webpack, Vite, or Turborepo.
• Experience working in agile environment (Scrum, Kanban).
• Basic understanding of Core Web Vitals (LCP, FID, CLS), performance metrics, and how to improve them for better user experience.
• Basic understanding of accessibility standards (WCAG) and how to implement accessible web applications.

 What makes you stand out:

• You should have a good understanding of modern web development technologies, feature rich CMS systems, and supporting highly trafficked global websites.
• You should have a good understanding of modern browsers regarding their abilities and limitations, across desktop and mobile.
• Experience in an agile environment and Scrum methodologies.
• Basic understanding of security concepts like API authentication/authorization, encryption, windows certificates.
• Sitecore CMS experience, or experience with similar CMS.
• Strong verbal and written communication skills (English).
• Experience woking with server-side rendering (SSR), static site generation (SSG), and Incremental Static Regeneration (ISR) use cases in Next.js.
• Knowledge of SEO best practices for modern web applications and how to implement SEO-friendly features (e.g. meta tags, structured data, schema, and SEO optimization for performance).
• Basic understanding of security concepts like API authentication/authorization, encryption, and Windows certificates.
• Familiarity with headless CMSs (e.g., Kontent.AI).

Education / Certification Requirements:

• Bachelor’s degree or higher in Engineering (Computer Systems, Software, IT&T, Systems)

Working environment:

• Hybrid 

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