Staff Fullstack Engineer, User Auth Experience

Sellhelp AB

We put items to better use. Hundred thousand a week actually. Enhancing our technical product is therefore at the top of our agenda. The scale of our operations creates complex, fascinating challenges. We thrive on engineering simple, elegant solutions to tackle them, and we are looking for someone whose craft can make a tangible impact on our rapidly growing customer base. Sellpy’s vision is to empower everyone to live circularly. We believe that every item deserves a second life, and we see huge financial, social and environmental value in making sure this happens. We look for those who share this vision and have the grit to tackle the challenges of building a circular future. Fullstack Engineer at Sellpy Sellpy serves both buyers and sellers, and both sides matter equally. As part of Sellpy Tech, you'll help hundreds of thousands of customers embrace a smarter, more sustainable way to shop. This is work that actually moves the needle on something that matters. We're looking for a Fullstack Engineer who cares about the customer experience and wants to push our technical product forward. This role is a great fit if you want to go deep on JavaScript, enjoy technical discussions, and thrive on real, varied challenges every day. Your ability to build features that integrate cleanly with our architecture and hold up in production is what makes the difference. We code for a circular future — and we build it together. Debates are welcome, opinions are expected, and everyone has a real say in how we shape Sellpy's architecture. In short, you will Build user-centric, next-generation web applications Work with JavaScript, React/React Native & Node across the stack Take ownership of features from idea to release and beyond Ensure scalability, maintainability and simplicity in everything you build Continuously improve Sellpy’s products and architecture Requirements B.S. or M.S. in Computer Science (or related), or equivalent proven experience 3+ years of professional software engineering experience Strong knowledge of JavaScript Experience from a fast-paced product environment Fluency in written and spoken English We’d be impressed if you have Experience with React, React Native, Node.js, Web Components, logging & monitoring Worked in a scaling, product-focused startup Hands-on experience with continuous integration & deployment Knowledge of AWS and Git You get to Be part of a tech-minded company that's driving the change towards a sustainable lifestyle. In return, you will get direction, energy, and work on meaningful challenges daily. Enjoy a vibrant office culture at Medborgarplatsen, balanced with hands-on experience at our production sites Work with highly skilled and motivated colleagues Gain new skills with unlimited access to a learning platform Make use of prepaid vacation Enjoy Sellpy credits and staff discounts at Sellpy and the H&M brands (Arket, COS, Other Stories, Weekday and more). Save up with a monthly pension plan Engagement in Sellpy’s social traditions with game nights, interactive planning days, guest speakers and other activities. Location On-site collaboration at our core, supported by a flexible hybrid setup on set days. This specific role is based at our Medborgarplatsen office. Hybrid work We value being together. After an on-site onboarding, we aim for a balanced office presence, with flexibility based on your team and tasks. Form of employment: Full-time Start: As agreed upon Öppen för alla Vi fokuserar på din kompetens, inte dina övriga förutsättningar. Vi är öppna för att anpassa rollen eller arbetsplatsen efter dina behov.

Stripe

Note: if you are an intern, new grad, staff, frontend or fullstack applicant, please do not apply using this link and visit our jobs page for those specific postings. WHO WE ARE ABOUT STRIPE Stripe is a financial infrastructure platform for businesses. Millions of companies — from the world's largest enterprises to the most ambitious startups — use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. ---------------------------------------------------------------------------------------------------------------------------------- About the Organization Payments and Risk Sub-orgs: Link and OCS, Payments Acceptance, Risk The Payments organization focuses on developing products and platforms that enable users to accept payments from customers efficiently. This includes building APIs for processing payments, enabling regional, non-card payment options, and extending Stripe's capabilities to make it easy for businesses to accept in-person payments. Optimized Checkout and Link teams work to create best-in-class checkout experiences that enhance customer satisfaction and drive merchant conversion rates. The Risk Engineering team develops products that minimize financial and regulatory risks while ensuring a seamless user experience, thereby safeguarding Stripe's brand and financial stability. Team Matching: Exact team matching for one of the sub-teams will begin during final stages. Please note we may also consider you for different orgs based on your experience, location, etc.  ---------------------------------------------------------------------------------------------------------------------------------- What you'll do We're looking for backend engineers who want to make an impact on managing money at a global scale with a passion for building ergonomic APIs. Our team collaborates with many cross-functional teams — from Infrastructure to Product — to deliver innovative solutions that address evolving user needs. Responsibilities * Design, build, and maintain APIs, services, and large-scale systems that reliably and efficiently handle billions of money movement requests * Debug and solve critical production issues across services and multiple levels of the stack * Mentor engineers to help them grow * Collaborate with stakeholders across the company to build new features at large scale, while improving internal engineering standards, tooling, and processes * Collaborate effectively in a distributed and hybrid team, maintaining open communication and strong connections with colleagues ---------------------------------------------------------------------------------------------------------------------------------- Who you are We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement. Minimum requirements * 2+ years of industry software engineering experience (does not include internships or co-ops) * Strong coding skills in any programming language (we understand new languages can be learned on the job, so our interview process is language agnostic) * Strong collaboration skills; can work across workstreams within your team and contribute to your peers' success * Ability to thrive with a high degree of autonomy and ownership, with an entrepreneurial mindset * Interested in working as a generalist across varying technologies and stacks to solve problems and delight both internal and external users Preferred qualifications * Experience with large-scale financial tracking systems * Good understanding and practical knowledge of cloud-based services (e.g., gRPC, GraphQL, Docker/Kubernetes, AWS, etc.)

Stripe

Note: if you are an intern, new grad, staff, frontend or fullstack applicant, please do not apply using this link and visit our jobs page for those specific postings. WHO WE ARE ABOUT STRIPE Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. About the team The Payments organization focuses on developing products and platforms that enable users to accept payments from customers efficiently. This includes building APIs for processing payments, enabling regional, non-card payment options, and extending Stripe's capabilities to make it easy for businesses to accept in-person payments. Optimized Checkout and Link teams work to create best-in-class checkout experiences that enhance customer satisfaction and drive merchant conversion rates. The Risk Engineering team develops products that minimize financial and regulatory risks while ensuring a seamless user experience, thereby safeguarding Stripe's brand and financial stability. Sub-orgs: Link & OCS, Payments Acceptance, Risk Team Matching: Exact team matching for one of the subteams will begin during the final stages. Please note we may also consider you for different orgs based on your experience, location, etc. ---------------------------------------------------------------------------------------------------------------------------------- What you'll do We're looking for backend engineers who want to make an impact on managing money at a global scale with a passion for building ergonomic APIs. You'll play a key role in extending our balance management platform and in building out a new funds accessibility platform leveraged by enterprises and SMBs alike. Our team collaborates with many cross-functional teams — from Infrastructure to Product — at Stripe to deliver innovative solutions that address evolving user needs. Responsibilities * Scope, design, build, and maintain APIs, services, and large-scale systems that reliably and efficiently handle billions of money movement requests * Debug and solve critical production issues across services and multiple levels of the stack * Mentor and support engineers' growth * Collaborate with stakeholders across the company to build new features at large-scale, while improving internal engineering standards, tooling, and processes ---------------------------------------------------------------------------------------------------------------------------------- Who you are We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement. Minimum requirements * 2–12+ years of industry software engineering experience (does not include internship or co-op experience) * Strong coding skills in any programming language (we understand new languages can be learned on the job so our interview process is language agnostic) * Strong collaboration skills; can work across workstreams within your team and contribute to your peers' success * Ability to thrive with a high degree of autonomy and responsibility, with an entrepreneurial approach to your work * Interest in working as a generalist across varying technologies and stacks to solve problems and delight both internal and external users Preferred qualifications * Experience with large-scale financial tracking systems * Good understanding and practical knowledge of cloud-based services (e.g., gRPC, GraphQL, Docker/Kubernetes, AWS, etc.)