Staff Software Developer (Kotlin Libraries)

Yubico

MEET YUBICO Yubico is a global leader in identity security and creator of the YubiKey, the original hardware-backed passkey. Publicly traded on Nasdaq Stockholm with headquarters in Sweden, the US, and Singapore, we protect everyone from everyday consumers to global enterprises with modern, phishing-resistant authentication. Why Join Our Mission? At Yubico, we are guided by a shared belief that your work matters. We operate under a cultural philosophy of Speed with Integrity, pushing the boundaries of technology to secure the AI frontier—protecting both human and agentic AI interactions—and leading the transition to post-quantum cryptography. In everything we do, we live by our core values: * Battle Friction: We constantly look for new ways to simplify our products, our work, and the user experience. * Inspire Higher: We think big, champion the open internet, and strive to do the right thing even when it is difficult. * One Team: We are open, responsive, and collaborative, overcoming challenges and celebrating our successes together. Aligned with our commitment to open standards, we foster a thriving builder ecosystem through the Yubico Developer Program, offering free open-source repositories, libraries, and SDKs to help developers rapidly integrate strong hardware authentication into any application. Through close collaborations with technical partners like Google, Microsoft, and Amazon, as well as newer frontiers like OpenAI, we continue to shape a safer digital world while donating security keys to protect vulnerable communities, journalists, and humanitarian groups worldwide through our Secure it Forward program. At Yubico, We Offer Yubico Values: We work to ensure that our employees have an open space to have their voices amplified to create a workplace where everyone feels like they belong. In support of this, our employees have created some pretty cool Employee Resource Groups that foster inclusion, help build community and connection across Yubico which all employees are welcome to join. Additionally, Yubico donates YubiKeys to organizations in need all over the world (you can read more about our work here). Social Connection: Relationships and connectedness matter, and we love spending time with our team! Our virtual workspace keeps us connected day-to-day whether it's through Yubico celebrating wins or our buzzing Slack communities. Check out our Life at Yubico Page on LinkedIn and our awards here. THE ROLE Yubico is looking for a Software Engineer to join the Platform team working on Yubikey as a Service. It is an Enterprise solution that customers use to manage the lifecycle of their credentials and YubiKey deployment at scale. You should have a passion for building the platform for Enterprise-grade applications. We are looking for a teammate who is proactive, works well within and across teams, and has a desire to do things right and learn. You will develop the platform to support products used by many top Enterprise companies and will get to see your work in use right away. Tasks and Responsibilities:  * Understand, enhance, maintain, and grow the platform that powers our services * Develop your skills in designing and developing a testable, scalable and globally-distributed set of services used by a variety of Enterprise customers * Work collaboratively across functions - Product Managers, Security, Infrastructure, UX designers, Support * Work with a variety of technologies and increase your experience in many areas, ranging from cloud platform services and REST design to data compliance and web security * Work collaboratively with a tight-knit, multi-national development team to create well-architected software * Participate in an on-call rotation and gain experience supporting business-critical Enterprise services BASIC QUALIFICATIONS * 3+ years of software development experience (or equivalent) * Experience building commercial software * Experience with back-end software development * Experience working with relational databases * Experience with one or more common web-backend languages such as (but not limited to) Java, Kotlin, Go, Python, JavaScript (Node.js), C#, Rust BONUS QUALIFICATIONS * Hands-on experience with Go and/or Java/Kotlin * Hands-on experience in one or more of the following technologies: Kubernetes, Docker, Redis * Experience with one of the three major cloud platforms * Authentication and authorization technologies, modern security practices   #LI-IR1 We are an equal opportunity employer, we value diversity and uphold an inclusive environment where all people feel that they are equally respected and valued. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity or expression, age, marital status, religion, national origin, disability, protected Veteran status or any other characteristic protected by law. We'd love to learn about what you can add to our diverse team. We are an E-Verify Participating Employer.   Yubico does not accept agency resumes or referrals so please do not send them to our careers staff or employees. Yubico is not responsible for any fees related to unsolicited resumes or referrals.   Personal data submitted through this form is used for managing Yubico’s recruitment activities, which include facilitating any application you make, setting up and conducting interviews and tests for applicants, evaluating and assessing results and selecting candidates, and as otherwise needed in our recruitment and onboarding processes. The use of your personal data may also be necessary prior to entering into a contract with you (that is prior to offering you a job with Yubico). Your personal data will only be used for the purposes for which it was collected and in accordance with the Yubico Privacy Notice. We only keep your personal data for as long as necessary and in compliance with Yubico’s record retention policies. If you have asked us to, we will keep you informed of other opportunities at Yubico. We do this in various ways, including email and by phone. If at any time you do not want us to contact you or use your information as described herein please contact us at jobs@yubico.com to let us know and we will delete all such information. Providing your personal data is voluntary, but necessary to join our talent community, and if you do not agree to provide your data, we will not be able to consider you as part of our talent community.   As part of providing the requested service, we will transfer your data to be processed by Greenhouse Software Inc., a service provider contracted by Yubico AB and/or its subsidiaries that meets legally mandated privacy requirements. The Yubico Privacy Notice offers more information about Yubico privacy practices, including the lawful basis for processing of personal data, how to lodge a complaint with the supervisory authority, and how to contact Yubico to exercise your data subject rights. In this notice, when we refer to "Yubico", "us", "we" or "our", we mean the Yubico group company or companies that you apply to, or correspond with, and which are responsible for any personal data collected about you.

Toast

Toast creates technology to help restaurants and local businesses succeed in a digital world, helping business owners operate, increase sales, engage customers, and keep employees happy. We’re not your traditional tech company and we don’t aim to be. Going against the grain is in our DNA. Building a revolutionary product begins with revolutionary thinking. That’s why we value diversity of background and lived experience. Together, we empower restaurants of all sizes to build great teams, increase revenue, improve operations, and delight their guests. We pair our deep understanding of the restaurant industry with powerful cloud based software and restaurant-grade hardware to deliver an intuitive all-in-one platform. Join us on our mission to empower the restaurant community to delight guests, do what they love, and thrive. Fintech at Toast operates one of the most critical portions of the Toast infrastructure: processing payments on behalf of our restaurants and ensuring that restaurants are paid in a timely manner. Payment processing is a key source of Toast’s revenue and also the lifeblood of our customers; we process millions of dollars in transactions per day.   We are seeking a Staff Software Engineer to join our Payments team to build our next generation payment processing platform by combining deep payments expertise with experience building AI agents and agentic systems. This platform offers a single, integrated service for payment acceptance across various channels and supports a configurable enterprise approach. It is designed to allow a build-once, available-to-all strategy for both existing and emerging payment methods. The successful candidate will guide and contribute to the development of services providing supporting and core functionality within and around this payment processing solution.   A day in the life (Responsibilities) * Plan, design, build, and deliver features for Toast’s payments products  * Roll - pun intended! - features out to customers, including monitoring for success * Collaborate with our PM (and UX) on the definition and design of features   * Collaborate and partner with a wide array of teams across Toast in order to spread knowledge inter- and intra-team * Participate in designing, estimating, implementing, testing, and debugging end-to-end agent solutions * Adopt and advocate for bleeding-edge spec-driven development and agentic development practices * Champion best practices for agent development, deployment, and quality life cycles * Lead and work with experienced engineers to deliver design and code review   What you'll need to thrive (Requirements) * 8+ years of experience in designing and implementing robust backend services * Experience or strong interest in using coding agents and adopting agentic development practices * Ability to step into a technical leadership role on the team, guiding/coaching/mentor more junior engineers on best practices in architecture, design, coding, testing, deployment, etc. * Proven ability to design and develop scalable and secure APIs that integrate with various internal/external systems * Applied knowledge of best practices in API lifecycle management, including versioning, documentation, and deprecation strategies, with the ability to share this amongst the team and peers * Demonstrated experience with microservices architecture and containerization technologies for enhanced scalability and maintainability Special Sauce (*Nice to Haves)   * Experience designing agentic products * Demonstrated proficiency with DynamoDB or PostgreSQL * Proficiency in Kotlin (or Java and willing to learn Kotlin) and Kotlin-specific frameworks and libraries for building efficient backend solutions * Experience with modern data architectures (event sourcing, OLAP, ETL/ELT, streaming data) * Experience designing payments APIs * Familiarity with PCI-DSS * Familiarity with AI-augmented development workflows and tools (e.g., Claude Code, GitHub Copilot, Codex, or similar)   #LI-HYBRID #BI-Hybrid AI at Toast At Toast, one of our company values is that we're hungry to build and learn. We believe learning new AI tools empowers us to build for our customers faster, more independently, and with higher quality. We provide these tools across all disciplines, from Engineering and Product to Sales and Support, and are inspired by how our Toasters are already driving real value with them. The people who thrive here are those who embrace changes that let us build more for our customers; it’s a core part of our culture. Our Total Rewards Philosophy  We strive to provide competitive compensation and benefits programs that help to attract, retain, and motivate the best and brightest people in our industry. Our total rewards package goes beyond great earnings potential and provides the means to a healthy lifestyle with the flexibility to meet Toasters’ changing needs. Learn more about our benefits at https://careers.toasttab.com/toast-benefits. How Toast Uses AI in its Hiring Process Throughout the hiring process, our goal is to get to know you. We use AI tools to support our recruiters and interviewers with tasks like note-taking, summarization, and documentation of interviews to ensure they can be fully focused on your conversation. All hiring decisions are made by people. To learn more: https://careers.toasttab.com/ai-in-hiring Our Approach to Hybrid Working We embrace a hybrid work model that fosters in-person collaboration while valuing individual needs. Our goal is to build a strong culture of connection as we work together to empower the hospitality community, regardless of location. Please visit the Locations page on our career site to learn more about our in-office expectations by region: https://careers.toasttab.com/locations-toast Diversity, Equity, and Inclusion is Baked into our Recipe for Success At Toast, our employees are our secret ingredient—when they thrive, we thrive. The restaurant industry is one of the most diverse, and we embrace that diversity with authenticity, inclusivity, respect, and humility. By embedding these principles into our culture and design, we create equitable opportunities for all and raise the bar in delivering exceptional experiences. We Thrive Together We embrace a hybrid work model that fosters in-person collaboration while valuing individual needs. Our goal is to build a strong culture of connection as we work together to empower the restaurant community. To learn more about how we work globally and regionally, check out: https://careers.toasttab.com/locations-toast. Apply today! Toast is committed to creating an accessible and inclusive hiring process. As part of this commitment, we strive to provide reasonable accommodations for persons with disabilities to enable them to access the hiring process. If you need an accommodation to access the job application or interview process, please contact candidateaccommodations@toasttab.com. ------ For roles in the United States, it is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Cyted Health

ABOUT US We’re Cyted, a pioneering gastrointestinal diagnostics company transforming earlier detection for oesophageal cancer and Barrett’s oesophagus. Our EndoSign test combines a swallowable capsule with advanced biomarkers and analytics to detect disease earlier, improving patient outcomes while reducing pressures on healthcare systems. What started as an idea between a health-tech entrepreneur and leading clinical scientists in Cambridge UK, has quickly grown internationally, backed by EQT Life Sciences and a $44M Series B investment. But we still work like a startup - because we are one. Things move quickly and we’re building as we go. Some days you’ll solve brand new problems and others you’ll roll your sleeves up and get things done. We’re a collaborative team, so your work matters. We have our investors trust, but you won’t disappear into layers of hierarchy, waiting months for decisions. If you've got a good idea, we want to hear it - whatever your role. We like curious, adaptable people who are always willing to learn. This isn’t a polished corporate - we’re building as we go.  If you're excited to help build something ambitious from the ground up that makes a real difference to patients' lives - we'd love to hear from you. Our four-stage process runs on a rolling basis, with each stage serving a clear purpose. Shaped by candidate feedback, we've designed it to give you honest insights into Cyted, whatever the role. 1. Initial conversation – A relaxed online conversation with Maddie from our People team to get to know you, talk through your experience and answer any questions you have about Cyted. 2. Line manager interview – An online discussion exploring the role in more detail through scenario-based and role-specific questions. 3. Team interview & assessment – Meet the wider team in person and see how we work. You'll complete a presentation or practical assessment so we can hear your ideas and see how you approach challenges at Cyted. 4. Final Interview – Marcel, our CEO, still meets every potential new joiner. It's an opportunity to discuss your ambitions and how they align with Cyted's journey and future vision. ROLE SUMMARY Our clinical platform is where clinicians, laboratory staff and pathologists interact with Cyted every day. You'll help evolve its front end, turning clinical workflows into intuitive, accessible experiences that make it easier for healthcare professionals to do their jobs. Working alongside engineers, commercial and operational teams and clinical specialists, you'll help shape features from early ideas through to release, learning directly from the people who use the platform while balancing user needs with clean, scalable engineering. We value fresh thinking and engineers who enjoy finding smarter ways to build reusable components and continually improve the front-end architecture. As Cyted expands into the US, you'll build on a platform that's already delivering real value in the UK. Using everything learned from our users, you'll help adapt and evolve the product for a new healthcare system, playing a meaningful role in the next stage of its growth in the US. If you're someone who enjoys learning, asking questions and improving with every project, you'll find plenty of opportunities to stretch yourself here. You'll be trusted to contribute, supported to grow, and encouraged to make a real impact within both the product and the engineering. WORKING PATTERN AND LOCATION This role is a full-time position with a standard 37.5 hour working week.    You will be based at the Cyted’s Head Office, Ground Floor, Building 3, Old Swiss, 149 Cherry Hinton Road, Cambridge, CB1 7BX, UK and be expected to be in the office 3 days per week. IN THIS ROLE YOU WILL BE ACCOUNTABLE FOR: User Insight and Collaboration * Engaging with pathologists, clinicians, and internal service teams to understand real-world workflows, challenges, and user needs. * Demonstrating work regularly, actively seeking challenge and feedback, and iterating solutions based on user insight. Front End Development * Designing and building intuitive, accessible user interfaces for laboratory staff, pathologists, and clinicians. * Translating clinical workflows into simple, effective digital experiences. * Partnering with backend engineers and international stakeholders to deliver seamless end-to-end products. * Building robust, scalable, and reusable front-end components and design patterns. * Raising issues early, proposing practical solutions, and taking on ownership through to successful delivery. Product and Platform Delivery * Shaping, designing, and delivering diagnostic platform capabilities aligned to business priorities and customer value. * Building reusable code and shared libraries that strengthen the long-term architecture of the platform. * Integrating third-party services to extend platform capability. * Championing new technologies and approaches that improve productivity, quality, and maintainability. Engineering Excellence * Proactively diagnosing and resolving technical challenges quickly and methodically. * Defining test plans, writing automated tests, and conducting manual testing where required. * Supporting security reviews, audits, and penetration testing, and implementing resulting recommendations. Ways of Working * Mentoring and supporting engineers across the team to raise technical standards and overall team impact. * Sharing expertise and promoting engineering best practice across the team. * Contributing to Agile delivery and a culture of continuous improvement. * Collaborating to plan, prioritise, and deliver work with clarity, discipline, and accountability. TO THRIVE IN THIS ROLE, YOU WILL HAVE: Qualifications & Experience * Experience building modern web applications using React and TypeScript. * Experience working with cloud technologies such as AWS, modern CI/CD practices or Infrastructure as Code (e.g. Terraform). * Contributions to RESTful APIs using JVM languages such as Scala or Kotlin, or a genuine interest in developing these skills. Skills & Knowledge * Enjoys building clean, scalable and maintainable software with a focus on user experience. * Strong problem-solving skills, with the desire and curiosity to investigate issues and find practical solutions. * Comfortable collaborating with engineers, product managers and users to understand problems and shape better software. Personal Attributes * Curious and always intrigued to keep improving your craft. * Takes ownership, shares ideas and enjoys working as part of a collaborative engineering team. * Happy supporting and learning from others, helping teammates grow while continuing to develop yourself. SUCCESS IN THIS ROLE WILL LOOK LIKE: Your first two weeks will be spent getting to know the team, how we work and the technology behind our platform. You'll have a buddy for those day-to-day questions, complete quality and compliance training related to our lab quality management system, and get right into our sprint meetings: stand ups, demos, retros and planning.  Within your first month you will get stuck in contributing to our team outcomes writing and testing code, whilst understanding our objectives, priorities and software stack. From chats and meetings with wider team members and users, you will start to form a solid understanding of what they really need from our software.  By six months, you'll be taking ownership of a meaningful piece of work from start to finish, whether that's delivering a FHIR API, building new features for pathologists or helping operationalise our R&D team's genetics pipeline. Along the way, you'll become a trusted member of the team, contribute to support, and help shape what we build next. BENEFITS *   25 days’ holiday + public holidays with the ability to purchase up to 5 additional days * Matched pension contributions up to 7% * Company paid private health insurance with access to wellbeing and fitness discounts, including dental, optical and audiological cover * Paid 4 week sabbatical after 4 years of service * Company paid income protection of 75% base salary following a 13 week deferred period and company paid life insurance of 4x basic salary * Regular team socials, Winter & Summer parties, and an annual Team Day * Electric Vehicle and Cycle to Work Schemes through salary sacrifice