{"data":{"id":175412,"slug":"frontend-engineer-checkout-team-to-kustom","type":"job","title":"Frontend Engineer (Checkout Team) at Kustom","description":"Do you thrive on tackling complex challenges? Are you passionate about creating impactful solutions that drive commerce forward? Do you believe in encouraging and elevating those around you? Then this position as Frontend Engineer might be something for you!\n\nAbout Kustom\nKustom, formerly known as Klarna Checkout (KCO), is the Nordic market leader in digital checkout solutions. Today, they support over 24,000 merchants across more than 170 countries, providing a streamlined checkout experience. They offer localized solutions in 18 markets, tailored to specific languages, currencies, and payment methods. No matter where businesses operate, they deliver a checkout experience that meets the needs of both merchants and shoppers - driving growth globally.\n\nAbout the position\nAs a Frontend Engineer at Kustom, you will be responsible for designing and implementing user interfaces using modern JavaScript frameworks. You will work closely with their designers, product managers and backend engineers to deliver seamless and engaging web applications that optimize user experience and drive conversion.\n\nIn this role, you will develop and evolve Kustom's checkout products, from the complete checkout experience to embeddable components that integrate into a wide range of online stores. You will also play an important role in developing Kustom's UI library, Morpheus, and the shared design language that brings Kustom's products together. The role comes with significant responsibility for the performance, reliability, and observability of business-critical code, while also promoting best practices in testing, accessibility, and security. You will contribute to the team's technical direction through code reviews, mentoring, and close collaboration with other engineers.\n\nAs a key member in the Checkout team, you'll be at the forefront of crafting exceptional digital experiences. We're not just looking for someone to write code - we're seeking a creative problem-solver who can transform ideas into intuitive, cutting-edge interfaces for Kustom's users. Your expertise will help shape the future of their products, making complex flows feel effortless.\n\nYour main responsibilities:\nFrontend development of checkout products, from full user experience to embeddable components.\nContribute to the UI library and shared design language.\nOwn the performance, reliability, and observability of code for business critical applications.\nWork with testing, security and foster best practices in the team.\nMentor other engineers, review code and contribute to the technical direction of the frontend.\n\nAbout you\nTo be successful in this position we believe that you have a Bachelor's degree in Computer Science, Engineering or similar. You have deep expertise in modern JavaScript and TypeScript frameworks and strong experience with React. You have a solid foundation with HTML, CSS and responsive, accessible UI. You have experience integrating with backend APIs and data flows. You have previous experience building web applications that operate in different markets, and are familiar with iframe and cross-origin integration patterns and how to safely run a piece of UI inside another product. Lastly, we believe that you have experience from fintech, e-commerce, SaaS or consulting environments to be a good fit.\n\nAs a person, we believe that you have strong communication skills and thrive in a business oriented, dynamic environment. You enjoy working independently at times, but also enjoy collaborating with the rest of the team. You are fluent in English and are able to work from Kustom's Stockholm office.\n\nImportant for the position:\nBachelor's degree in Computer Science, Engineering or similar.\nDeep expertise in modern JavaScript and TypeScript frameworks.\nStrong experience working with React.\nSolid foundation in HTML, CSS and responsive, accessible UI.\nExperience integrating with backend APIs and data flows.\nPrevious experience building web applications that operate in different markets.\nFamiliar with iframe and cross-origin integration patterns.\nExperience from fintech, e-commerce, SaaS or consulting environments.\n\nKustom's offer\nAt Kustom, you'll have the opportunity to make a real impact on their users' daily interactions. If you're passionate about creating high-performance web applications and thrive on turning ambitious design concepts into reality, we want to hear from you.\n\nKustom offers a competitive benefits package designed to support both your financial security and overall wellbeing. This includes a comprehensive pension package with both national and occupational pension contributions, extensive health insurance, long-term illness protection, and flexible salary exchange options. Employees also receive an annual wellness allowance of 3,000 SEK to support activities that keep them healthy and energized. In addition, you get an extra day off when major holidays, such as Christmas Eve or New Year's Eve, fall on a weekend.\n\nPractical details\nStart: as agreed upon.\nExtent: full time, 100%.\nLocation: Stockholm.\nSalary: as agreed upon.\n\nDo you find the position as Frontend Engineer interesting? We at Needo are looking forward to hearing from you!\n\nWe are only able to process applications sent through our application form.","language":"sv","is_translated":true,"title_original":"Frontend Engineer (Checkout Team) to Kustom","description_original":"Do you thrive on tackling complex challenges? Are you passionate about creating impactful solutions that drive commerce forward? Do you believe in encouraging and elevating those around you? Then this position as Frontend Engineer might be something for you!About KustomKustom, formerly known as Klarna Checkout (KCO), is the Nordic market leader in digital checkout solutions. Today, they support over 24,000 merchants across more than 170 countries, providing a streamlined checkout experience. They offer localized solutions in 18 markets, tailored to specific languages, currencies, and payment methods. No matter where businesses operate, they deliver a checkout experience that meets the needs of both merchants and shoppers - driving growth globally.About the positionAs a Frontend Engineer at Kustom, you will be responsible for designing and implementing user interfaces using modern JavaScript frameworks. You will work closely with their designers, product managers and backend engineers to deliver seamless and engaging web applications that optimize user experience and drive conversion.In this role, you will develop and evolve Kustom\u2019s checkout products, from the complete checkout experience to embeddable components that integrate into a wide range of online stores. You will also play an important role in developing Kustom\u2019s UI library, Morpheus, and the shared design language that brings Kustom\u2019s products together. The role comes with significant responsibility for the performance, reliability, and observability of business-critical code, while also promoting best practices in testing, accessibility, and security. You will contribute to the team\u2019s technical direction through code reviews, mentoring, and close collaboration with other engineers.As a key member in the Checkout team, you'll be at the forefront of crafting exceptional digital experiences. We're not just looking for someone to write code - we're seeking a creative problem-solver who can transform ideas into intuitive, cutting-edge interfaces for Kustom\u2019s users. Your expertise will help shape the future of their products, making complex flows feel effortless.Your main responsibilities:\nFrontend development of checkout products, from full user experience to embeddable components.\nContribute to the UI library and shared design language.\n Own the performance, reliability, and observability of code for business critical applications.\nWork with testing, security and foster best practises in the team.\nMentor other engineers, review code and contribute to the technical direction of the frontend.\n\nAbout youTo be successful in this position we believe that you have a Bachelor\u2019s degree in Computer Science, Engineering or similar. You have deep expertise in modern JavaScript and TypeScript frameworks and strong experience with React. You have a solid foundation with HTLM, CSS and responsive, accessible UI. You have experience integrating with backend APIs and data flows. You have previous experience building web applications that operates different markets, and are familiar with iframe and cross-origin integration patterns and how to safely run a piece of UI inside another product. Lastly, we believe that you have experience from fintech, e-commerce, SaaS or consulting environments to be a good fit.As a person, we believe that you have strong communication skills and thrive in a business oriented, dynamic environment. You enjoy working independently at times, but also enjoy collaborating with rest of the team. You are fluent in English and are able to work from Kustom\u2019s Stockholm office.Important for the position:\nBachelor\u2019s degree in Computer Science, Engineering or similar.\nDeep expertise in modern JavaScript and TypeScript frameworks.\nStrong experience working with React.\nSolid foundation in HTLM, CSS and responsive, accessible UI.\n Experience integrating with backend APIs and dataflows.\nPrevious experience building web applications that operates different markets.\n Familiar with iframe and cross-origin integration patterns.\nExperience from fintech, e-commerce, SaaS or consulting environments.\n\nKustom\u2019s offerAt Kustom, you'll have the opportunity to make a real impact on their users' daily interactions. If you're passionate about creating high-performance web applications and thrive on turning ambitious design concepts into reality, we want to hear from you.Kustom offers a competitive benefits package designed to support both your financial security and overall wellbeing. This includes a comprehensive pension package with both national and occupational pension contributions, extensive health insurance, long-term illness protection, and flexible salary exchange options. Employees also receive an annual wellness allowance of 3,000 SEK to support activities that keep them healthy and energized. In addition, you get an extra day off when major holidays, such as Christmas Eve or New Year\u2019s Eve, fall on a weekend.Practical detailsStart: as agreed upon.Extent: full time, 100%.Location: Stockholm.Salary: as agreed upon.Do you find the position as Frontend Engineer interesting? We at Needo are looking forward hearing from you!We are only able to process applications sent through our application form.","price":null,"currency":"SEK","status":"active","noindex":true,"location":{"address":"Sturegatan 6","full_address":null,"city":"Stockholm","country":"SE","latitude":59.336696939561,"longitude":18.073545172675},"metadata":{"region":"Stockholms l\u00e4n","duration":"Tills vidare","employer":"Needo Recruitment Sthlm AB","postcode":"11435","positions":1,"profession":"Frontend-utvecklare","salary_type":"Fast m\u00e5nads- vecko- eller timl\u00f6n","scope_of_work":"100\u2013100 %","working_hours":"Heltid","contact_person":"Philip Ackeborn","employment_type":"full_time","occupation_field":"Data\/IT","employer_workplace":"Kustom","experience_required":true,"employment_type_label":"Vanlig anst\u00e4llning"},"user_id":null,"is_sponsored":false,"views_count":0,"ai_views_count":4,"ai_vendor_counts":{"other":1,"openai":2,"anthropic":1},"visibility":"public","submission_source":null,"submission_ai_name":null,"has_owner_email":true,"can_contact_owner":true,"phone":"+46736709170","owner_email":"philip@needo.se","images":[],"published_at":"2026-08-27T15:33:32+00:00","expires_at":"2026-09-13T23:59:59+00:00","created_at":"2026-08-28T03:18:52+00:00","updated_at":"2026-08-29T03:33:45+00:00"}}