Kotlin jobs in crypto and blockchain companies

(Full-time; Remote, Preferably: European time zone)Welcome to Reown, the onchain UX platform.Previously known as “WalletConnect Inc”, Reown equips builders with the tools needed to create seamless, secure, and intuitive digital ownership experiences.Since its beginnings as a simple QR code in 2018, the WalletConnect Network has grown into a comprehensive ecosystem, serving over 6,000 apps, 600+ wallets, and 15+ million users.Reown offers cutting-edge toolkits like AppKit and WalletKit, designed to enhance web3 interactions. AppKit enables smooth wallet integrations, login options, and on-chain transactions, while WalletKit focuses on securing and simplifying wallet connections to thousands of apps, supporting both EVM and non-EVM blockchains.Backed by $25 million in funding from some of the world’s best crypto and infrastructure investors such as Union Square Ventures, 1kx, Shopify, Coinbase Ventures, Circle Ventures, and Uniswap Labs Ventures, Reown is a global, remote-first team that values openness, simplicity, innovation, and ownership.The Role:Reown is seeking a meticulous and experienced Quality Assurance Tester to uphold and elevate the quality of our products. As our first dedicated QA hire, you’ll have the unique opportunity to define and shape our approach to quality, complementing our existing automated testing framework. If you’re driven by a passion for excellence, thrive in collaboration, and are eager to play a critical role in delivering seamless on-chain user experiences, we want to hear from you. Responsibilities:UI Testing & Validation: Perform thorough, hands-on testing of UI workflows and screens that are not covered by automated tests. Create test plans to ensure that all aspects of the product meet testing expectations Identify, document, and track bugs, ensuring detailed and reproducible steps for engineers to resolve issues efficiently. Collaborate with product managers, designers, and engineers to understand requirements, user flows, and expected outcomes for features and fixes. Release Gating Act as the "key approver" for pull requests (PRs) being merged, ensuring only high-quality deliverables progress to production. Validate that features meet design specifications and function flawlessly across various browsers and devices. Ensure that the appropriate test coverage has been added for new code or a fixed issue whenever possible. Bug Management & Organization Help maintain organization in Linear, properly labeling, categorizing, and prioritizing bugs. Work with the team to refine processes for bug triaging and resolution. Quality Practice Development Advocate for and implement best practices around quality assurance across the organization. Drive the development of robust testing practices and workflows to improve overall product reliability. Quality Metric & Reporting Define and track quality metrics to provide actionable insights into the organization’s testing and development processes. Regularly report on the state of quality across teams and recommend areas for improvement. RequirementsMust-Have: 3+ years of hands-on experience in quality assurance, testing, or a similar role. Strong understanding of blockchain technology, cryptocurrency wallets, and the mechanics of on-chain transactions. Exceptional attention to detail, with a keen eye for spotting inconsistencies or bugs. Entrepreneurial mindset - willingness to do whatever it takes to get the job done. Experience testing user interfaces, workflows, and end-to-end user journeys on both web and mobile. Strong communication skills, with the ability to work effectively with cross-functional teams. Familiarity with tools like Linear, Jira, or similar issue-tracking systems (we use Linear). Nice-to-Have: You’ve used Reown / WalletConnect tools Familiarity with Agile development methodologies. Proficiency in reporting and defining quality metrics to monitor product health. In-depth knowledge of user experience principles and best practices, with a track record of delivering intuitive and user-friendly products. Ability to write/improve automated tests for the web in JavaScript and optionally in other platforms e.g. React Native/Flutter/Swift/Kotlin Benefits Fully remote position with a budget for your home office or work environment Regular team offsites to amazing places around the world Opportunities to travel to conferences and community events Generous PTO and parental leave Meaningful Learning and Development budget Competitive compensation package including salary & equity If you’re in the US, we’ll also cover your healthcare The chance to build and grow with one of the most recognized companies in Web3 and have fun while we do it Reown is an equal opportunity employer and we encourage applications from candidates of all backgrounds and experiences. We celebrate diversity and are committed to creating an inclusive environment for all employees.About the companyWelcome to Reown, the onchain UX platform. Previously known as “WalletConnect Inc”, Reown equips builders with the tools needed to create seamless, secure, and intuitive digital ownership experiences.

  Why Entersekt   Founded over 16 years ago, with more recent investments from Accel-KKR, Entersekt is a leader in mobile authentication, mobile app security, and payments enablement technology, offering highly scalable products with a track record of success across multiple continents.   Entersekt enables secure digital transactions for leading financial institutions globally. We exist to create a world where everyone can transact digitally without fear or compromise. Currently, we protect the digital transactions of over 210 million active users on our platform and hold 120 active patents that recognize innovation in digital security, payments, and user experience. Entersekt offers their customers secure authentication and digital payments experiences that remove unnecessary friction. Entersekt has invested in, and created, a diverse product portfolio that positions the company well to execute on its expansion in North America and European markets.The Ideal Candidate We are looking for a mobile software engineer with an interest in research and development (R&D), excited about working on early-stage prototypes and proof-of-concept projects. This role sits within the Signal Collection team in the Advice & Intelligence POD, where creativity, experimentation, and problem-solving are essential. This team plays a crucial role in developing prototypes and evaluating new technologies that can advance Entersekt’s offerings. As a mobile engineer in this team, you’ll be responsible for designing, building, and iterating on mobile-centric solutions that leverage iOS, Android, and full-stack technologies. Your contributions will help shape the future direction of the company’s products and technical capabilities. The Role As part of the Signal Collection team, you’ll be responsible for developing mobile prototypes and POCs that push the boundaries of what's possible in the digital security landscape. Working closely with R&D peers, you’ll contribute to full-stack projects involving iOS, Android, and TypeScript-based back-end systems. Specific tools and technologies aren’t prescribed, so you’ll need to be adaptable and comfortable experimenting with a wide range of development environments. You’ll help conceptualize and build technical prototypes, gather feedback from stakeholders, and iterate rapidly to refine your solutions. You’ll also be expected to take ownership of research into cutting-edge mobile technologies and evaluate their potential application in Entersekt’s core business. Responsibilities Prototype Development: Design and implement mobile-centric POCs and prototypes across Android, iOS, and web-based environments. Collaboration: Work closely with cross-functional R&D teams to brainstorm, design, and develop innovative solutions that align with Entersekt’s strategic goals. Technology Research: Research and evaluate emerging technologies and frameworks that could enhance mobile and full-stack development. Full-stack Contribution: Contribute to backend development using TypeScript-based systems, and web development as needed for holistic solution building. Architectural Input: Participate in architectural discussions, providing insights on mobile engineering, security, and best practices. Iterative Development: Take rapid feedback from stakeholders and team members to iteratively improve POCs and prototypes. Skills and Experience Successful candidates for this role will generally possess the following qualifications and skills: 3+ years of experience in mobile development with proficiency in Java, Kotlin, Swift, or Objective-C. Full-stack development experience, with knowledge of TypeScript (Node.js) back-end systems and web technologies like Angular, React, or Vue. Experience with building POCs and prototypes, with a willingness to work in a fast-paced R&D environment. Strong understanding of mobile development frameworks (iOS and Android). Solid understanding of object-oriented (OO) design patterns, SOLID principles, and software design fundamentals. Exposure to Agile practices like Scrum or Kanban. Familiarity with mobile security best practices and secure coding techniques. Experience with RESTful API design and integration. Experience with hybrid mobile development frameworks (e.g., Cordova, Ionic). Knowledge of mobile SDK API design and development. Experience with Docker, Kubernetes, and containerization within a mobile environment. Understanding of cryptography and public key infrastructure (PKI) is advantageous. Personality Attributes A strong interest in innovative development, and the ability to see projects from concept to completion. Creative problem-solving: ability to think outside the box and develop unconventional solutions. Eager to learn, with a passion for experimenting with new tools and frameworks. Self-driven and able to work independently, but also a great collaborator who thrives in team settings. A love for building: hands-on, excited about creating and refining technical solutions through iteration. Strong communication skills: able to articulate complex ideas clearly and concisely.   We place a lot of value on how we treat prospective employees and appreciate the time and effort that goes into job hunting. That is why we aim to keep the hiring process as quick and seamless as possible while ensuring the best possible fit for both you and the company. Working at Entersekt is truly a dream. You get exposed to cutting-edge technology, colleagues who are leaders in their fields, and an awesome working environment that includes flexible hours, remote work, and plenty of growth opportunities. Apply for this position by following the "apply now" tab and or viewing our other roles at Entersekt Careers page.