Frontend Software Engineer at Cityswift

About CitySwift: CitySwift is the world’s leading performance optimisation platform for public transport, enabling data-driven decision-making for some of the largest transport networks globally. Backed by over €15 million in venture capital funding, we partner with major public transport operators and government authorities, including Go-Ahead Group, Transport for London, and many more. CitySwift is experiencing accelerated growth, with 117% year-over-year revenue growth in 2025. Our mission is to increase the adoption of sustainable public transport worldwide. Today, our platform optimises more than 3 billion passenger journeys annually, and our target is to reach 10 billion journeys by the end of 2026. At CitySwift, you’ll have the opportunity to take ownership, make a measurable impact, and grow professionally as part of a collaborative, mission-driven team. Join us in shaping the future of public transport by driving the next phase of CitySwift’s growth. How we work CitySwift is headquartered in Ireland, with our second office hub in London. We also have team members based in Australia, Singapore and across parts of the EU. Hybrid working is the default in Ireland (with some exceptions), with remote and hybrid options across the UK and beyond. All roles have core hours of 10am to 4pm, giving you flexibility around how you structure your day. Collaboration really matters to us, with quarterly and bi-monthly meet-ups depending on your department or area of work, but we’re sensible about it – we won’t ask you to come into the office to tick a box. Our offices are designed for proper collaboration (and are dog friendly!). We also believe trust and rest matter. Annual leave starts at 25 days, and our work abroad programme gives you the option to work from another country for up to six weeks. We move fast, expect a lot from each other and back people to do their best work. The role This role exists because of growth. You’ll be stepping into real problems that matter now, not hypotheticals, and will be expected to make things better, faster and more scalable. This role requires someone who has a very strong understanding of JavaScript and can write clean, well-documented code but is not afraid to implement a quick fix when necessary. While you don't need to have prior experience with specific libraries or frameworks, you're comfortable diving into and learning new ones as needed. You're eager to share your opinions and ideas to help us continuously improve our processes and workflows. You're a quick learner and willing to embrace new technologies and approaches as we evolve. What you’ll own This is a role with real responsibility and autonomy. You’ll own outcomes, make decisions and help shape how we work as we scale, in an environment that values respect, directness and good intent. What is required: • Previous software engineering experience • Expert level knowledge of JavaScript / Typescript • Strong understanding of modern CSS best practices and browser Web APIs • Experience with a JavaScript frameworks such as React, Vue, Svelte or Angular • Demonstrated empathy for design and UX best practice. • Experience with testing frameworks such as Jest, Puppeteer, Cypress or Testcafe Nice to have • Good Back-end knowledge and coding experience in Python or Java • Previous experience working with data visualisation libraries such as E-Charts, D3.js, HighCharts, Recharts • Good experience working with smaller teams and proven project management skills • Geo-visualization tools and mapping integrations • Experience with Tanstack for URL routing and state management • Previous experience working on dynamic and challenging dashboards • Previous experience writing UI components with performance and accessibility in mind. • Experience implementing design systems (Bonus point for Figma and Storybook experience) What you’ll get at CitySwift • A role with real scope, where your impact is visible, your salary is reviewed as we grow, and there are career progression opportunities as the company scales and internationalises. • Comprehensive health and life insurance through Laya Healthcare in Ireland and Aviva in the UK. • Flexible working with hybrid working as the default in Ireland, core hours of 10am to 4pm, remote options depending on role and a work abroad programme of up to 6 weeks. • 25 days annual leave from day one, increasing by half a day per year of service, plus company days off, a half day before public holidays and an end of year shutdown. • Enhanced family leave, including 6 months fully paid maternity leave and 3 weeks paid paternity leave after 18 months’ service (and wedding leave!) • And on top of all of this, the usuals done well. A matching pension scheme that increases with service, paid sick leave, bike to work scheme, wellbeing supports, and an employee referral programme with rewards of up to €4,000 (or equivalent) per referral.