Senior Engineer, Full-stack Custom Solutions

Clio is the global leader in legal AI technology, empowering legal professionals and law firms of every size to work smarter, faster, and more securely. We are transforming the legal experience for all by bettering the lives of legal professionals while increasing access to justice. Summary: We are currently seeking a Senior Full-stack Engineer to join our Engineering team. This role is available to candidates across Barcelona and Madrid, with preference in Barcelona. The Senior Full-stack Engineer for the Customer Tooling Squad will play a critical role in Clio. With responsibilities spanning both front-end and back-end development, this individual will take ownership of complex technical challenges across the customer's ERP ecosystem and related systems. They will mentor junior engineers, collaborate with cross-functional teams, and deliver high-quality solutions that improve the customer experience and operational workflows. The Senior Fullstack Engineer will drive initiatives to modernise the customer tooling, reduce technical debt, and enhance integrations with internal and external systems, ensuring the continued success and evolution of customer support and engagement infrastructure. A day in the life might look like: Work across the complete stack to design, develop, and implement new features and modern web components. Write and maintain clean, efficient, and reliable code for both front-end and back-end systems. Identify and resolve issues in existing and new code to ensure the smooth, continuous operation of web applications. Maintain and optimise APIs to ensure high performance and reliability. Implement dynamic user interfaces in the frontend application, prioritizing seamless user experiences. Lead projects through all phases from conception to finished product, collaborating with cross-functional teams and stakeholders. Drive the modernisation of the tech stack, migrating legacy systems to modern frameworks and cloud-native architectures to ensure scalability, maintainability, and performance. You may be a fit for this role if: Bachelor's degree in Computer Science, Engineering, or a related technical field. Delivered end-to-end solutions by combining 4+ years of solid experience in Ruby on Rails backend development with proficiency in JavaScript/TypeScript frameworks to create high-performance frontends. Proven experience with web components, including design and implementation, to build dynamic and reusable UI elements. Strong expertise in cloud-based solutions, with a particular focus on AWS environments, to build scalable and reliable systems. Strong knowledge of API design and management, ensuring high availability and performance. Excellent problem-solving skills and the ability to troubleshoot and optimise complex codebases. Serious bonus points if you have: Experience in LegalTech, content platforms, or large-scale data systems is desirable but not essential. Familiarity with search technologies. Fluent in Spanish and English What you will find here: Compensation is one of the main components of Clio's Total Rewards Program. We have developed a series of programs and processes to ensure we are creating fair and competitive pay practices that form the foundation of our human and high-performing culture. Some highlights of our Total Rewards program include: Competitive, equitable salary. Top-tier medical and dental coverage at preferred employee pricing for you and your family, with access from Day 1. Clio offers a flexible hybrid work environment with intentional in-person gatherings to build connection. 23 Days Paid Time Off + Company Observed Holidays including short Fridays as well as a summer schedule for work-life balance. Professional development and growth options Pet friendly workspace in our Barcelona office Company events and social-impact programs that reinforce our shared values, community, and culture. Clioversary recognition program with special acknowledgement at 3, 5, 7, and 10 years Please note salary bands may differ based on location and local currency. Additionally, benefits may differ depending on the employee's location. Diversity, Inclusion, Belonging and Equity (DIBE) & Accessibility Our team shows up as their authentic selves, and are united by our mission. We are dedicated to diversity, equity and inclusion. We pride ourselves in building and fostering an environment where our teams feel included, valued, and enabled to do the best work of their careers, wherever they choose to log in from. We believe that different perspectives, skills, backgrounds, and experiences result in higher-performing teams and better innovation. We are committed to equal employment and we encourage candidates from all backgrounds to apply. Clio provides accessibility accommodations during the recruitment process. Should you require any accommodation, please let us know and we will work with you to meet your needs. Learn more about our culture at clio.com/careers We're a Human and High Performing AI company, meaning we use artificial intelligence to improve all of our operations. In recruitment, AI helps us streamline the process for greater efficiency. However, we've built our systems to ensure that a human always reviews AI-generated output, and we never make automated hiring decisions. Disclaimer: We only communicate with candidates through official @clio.com email addresses. About Clio At Clio, we are on a mission to transform the legal experience for all. As the world's leading provider of cloud-based legal software, we provide lawyers with low-barrier, affordable solutions to manage and grow their firms more effectively, more profitably, and with better client experiences. Through the cloud, we believe that we can help create a more inclusive legal community and a more equitable legal system. We are an award-winning team that has been recognized as one of Canada's Best Managed Companies, Canada's Most Admired Cultures and has topped Fast Company's list of Most Innovative Companies. In line with our mission, we've been up to some big things, including becoming a multi-product company, launching a $1 million COVID-19 Legal Relief Initiative, and most recently, securing a US$110M Series E funding round and a USD $1.6B valuation. This is a historic moment in the growth of legal technology! As the first legal practice management unicorn globally, and one of only a handful of Canadian unicorns, this is only the beginning. If you've ever wanted to do the best work of your career, while having a meaningful impact in the lives of others, then Clio is the place for you.