Senior Fullstack Software Engineer

About UsAt Perk, we are revolutionizing travel and spend management through our intelligent platform designed to eliminate tedious manual tasks. Our innovative tools automate everything from travel bookings to expense management, enabling employees to focus on what truly matters. With a mission to boost productivity and foster innovation, we aim to tackle the $1.7 trillion problem of lost productivity, which costs employees an average of 7 hours of productivity each week.Founded in 2015, Perk has rapidly grown to over 1,800 employees across 12 offices worldwide, with our headquarters situated in London and Boston. Our commitment to innovation, simplicity, and control shapes how businesses operate and improves employee satisfaction.We uphold values like ownership, delivering a stellar 7-star experience, and teamwork. At Perk, we believe in the power of curiosity, purpose, and mindset in unlocking your full potential. Our diverse talent team comprises experts from the travel and SaaS industries across 70+ countries. If you are passionate about making a significant impact and transforming the work experience for millions, we invite you to join our team.To learn more about us, visit www.perk.com.In the Platform function at Perk, we establish the foundational infrastructure that supports our entire organization. We manage shared infrastructure, core services, and developer tools that empower product teams to innovate swiftly while ensuring stability. Our contributions may be behind the scenes, but their effects are felt throughout the company in terms of reliability, scalability, security, and developer experience.

About AbacumAbacum stands at the forefront of Business Planning solutions tailored for finance teams. Our innovative platform automates reporting, enhances collaboration, and streamlines planning and forecasting, empowering finance teams to transition from mere number crunching to making strategic decisions.Founded in 2020 by visionary former CFOs, we have rapidly expanded to a global workforce of 100+ talented individuals representing 30+ nationalities. With our headquarters in New York and additional offices in London and Barcelona, we are proud to serve esteemed clients such as Dish Networks, Strava, BetterUp, Kajabi, JG Wentworth, Abridge, Cortex, among many others.Having successfully raised over $100 million, we recently concluded our $60M Series B funding round in June 2025, led by Scale Venture Partners with strong backing from Cathay Innovation, Y Combinator, Atomico, Creandum, and angel investors from Adyen, Zapier, and Twitch.Our ambitious mission is to redefine Business Planning—join Abacum and be part of this groundbreaking journey!We are looking for...An enthusiastic Senior Frontend Engineer who thrives on solving intricate, market-defining challenges—such as developing a real-time, multidimensional calculations engine!This is a rare opportunity to engage in an agile coding environment, directly influence our product, and shape our engineering culture and technical design.If you are someone who takes pride in ownership of your work, learns swiftly, and is eager to contribute to something extraordinary, we invite you to apply!

Join TransPerfect, a dynamic company with an innovative start-up culture, as we seek talented and entrepreneurial individuals like you to enhance our global team. We are looking for a Frontend Engineer who will play a pivotal role in the quality, development, and execution of our software products. If you are eager to contribute to a thriving organization and make an immediate impact, we want to hear from you!About TransPerfect – TechOps:The TechOps team at TransPerfect has been integral to our success for over a decade, providing technology and services that have immensely simplified processes for our clients and colleagues alike. From workflow enhancements to the foundational services of our GlobalLink platform, we create scalable user interfaces that empower even novice users to navigate complex systems effectively.

blp-digital seeks a Senior Frontend Engineer to join its onsite team in Barcelona. This position centers on building user interfaces that improve how people interact with web applications. Collaboration is key: expect to work closely with both designers and backend developers to deliver features that support a strong user experience. Responsibilities Develop and maintain web applications using modern JavaScript frameworks Partner with design and backend teams to create intuitive and effective interfaces Influence the architecture and design of frontend solutions Support the quality and reliability of the codebase Work location This role is based onsite in Barcelona, Spain.

Join Datavant as a Senior Platform Engineer and play a pivotal role in shaping our platform's architecture and functionality. We are seeking an innovative and technically proficient individual who thrives in a fast-paced environment. You will be responsible for developing scalable solutions, ensuring the reliability of our services, and collaborating with cross-functional teams to enhance our platform's features.

About UsAt Perk, previously known as TravelPerk, we have developed an innovative platform that revolutionizes travel and expense management. Our mission is to eliminate the tedious manual tasks that hinder productivity, providing automated solutions for everything from travel bookings to expense reports and invoice processing. We aim to combat the inefficiencies that cost employees an average of 7 hours of lost productivity every week, representing a staggering $1.7 trillion challenge.Trusted by over 10,000 companies globally, including names like Wise, On Running, Breitling, and Fabletics, we strive to empower businesses to focus on impactful work. Since our inception in 2015, Perk has expanded rapidly, employing over 1,800 individuals across 12 international offices, with headquarters in London and Boston.Our company culture is driven by core values such as ownership, delivering a 7-star experience, and teamwork. We emphasize curiosity, purpose, and mindset—recognizing that these attributes unlock potential beyond mere knowledge. Our diverse talent team comprises leading professionals from the travel and SaaS sectors, representing more than 70 countries. If you're passionate about making a significant impact and transforming how millions experience work, we would love for you to join us.To learn more about us, visit www.perk.com.We seek intelligent individuals who can leverage the best tools and processes to excel in their roles. Join our enthusiastic team and play a crucial role in shaping the visual identity of our platform, website, and internal tools. As a key member of our engineering team, you will not only deliver high-quality product features and advanced internal tools but also lead the ongoing improvement and evolution of our frontend architecture.

Join TransPerfect, a dynamic company with a vibrant start-up culture, as a Junior Frontend Engineer. We are looking for innovative and entrepreneurial individuals to enhance our global team. In this role, you will be instrumental in ensuring the quality, development, and execution of our software products. If you are eager to make an immediate impact in a growing organization, we invite you to apply!About TransPerfect – TechOps:The TechOps team at TransPerfect has played a crucial role in our success over the past decade, providing technology and services that significantly improve the workflow for both clients and colleagues. From enhancing core services of our GlobalLink platform to designing scalable client interfaces that simplify complex processes for users, we are dedicated to innovation and excellence.

Join Our Team at QuadriviaQuadrivia is a pioneering health technology company that has developed Qu, an innovative AI assistant tailored specifically for clinicians. In response to the critical shortage of healthcare professionals, Qu offers immediate, personalized, and dependable support for clinical tasks across the healthcare continuum. Our solution is designed for healthcare providers, payers, and pharmaceutical companies, allowing for easy customization and seamless integration into existing workflows, ensuring precise assistance throughout the care spectrum.Your RoleAs a Senior Frontend Engineer, you will be responsible for crafting secure and intuitive interfaces for clinicians, B2B customers, and patients that interact with our agent-based clinical AI system. Your primary focus will be to deliver a flawless end-to-end web experience that meets the highest standards of quality.Key ResponsibilitiesDevelop high-quality frontend applications using React and Typescript.Implement secure data flows in compliance with regulatory standards.Create real-time interfaces for chat, voice, clinical workflows, and operational tools.Collaborate closely with design, clinical teams, QA engineers, and backend engineers.Ensure accessibility, clarity, and safety in all UI components.Maintain stringent performance, latency, and reliability standards.Deliver pixel-perfect, test-driven components using robust CI/testing practices.Required ExperienceOver 10 years of frontend development experience with React and Typescript.Proven track record in building real-time interactive interfaces (chat, voice, agent UI).Strong skills in frontend architecture and performance optimization.Experience in regulated or high-risk domains, preferably healthcare.Deep understanding of API integration, state management, and WebSockets.Strong knowledge of OAuth2.Proficiency in WebRTC technologies.Exceptional communication skills—clear, structured, and concise, preferably following the STAR/SAR method.Experience in healthcare or related fields.Preferred QualificationsFamiliarity with design systems tailored for regulated environments.Experience in event-driven applications.

About UsPerk (formerly TravelPerk) is the leading intelligent platform dedicated to travel and spend management. Designed to alleviate the burdensome, manual tasks that hinder productivity, our innovative tools automate everything from travel bookings to expense management, invoice processing, and beyond. By eradicating the shadow work that squanders valuable hours, diminishes morale, and stifles creativity, we aim to empower genuine work that makes a tangible difference.With the trust of over 10,000 companies globally, including industry leaders such as Wise, On Running, Breitling, and Fabletics, we are committed to addressing the 7 hours of lost productivity per employee each week, which amounts to a staggering $1.7 trillion challenge.Founded in 2015, Perk has expanded into a vibrant global entity with over 1,800 employees across 12 offices, including our headquarters in London and Boston. We blend innovation, control, and simplicity to revolutionize how businesses operate and enhance workplace satisfaction.At Perk, our core values drive us—embracing ownership, delivering a 7-star experience, and collaborating as one unified team. We prioritize curiosity, purpose, and mindset over mere knowledge to unleash your full potential. Our talent team is a mosaic of prominent professionals from the travel and SaaS sectors, representing over 70 countries. If you're passionate about creating a real impact and redefining how millions experience work, we would be thrilled to welcome you to our team.Learn more about us at www.perk.com.The Platform team at Perk lays the groundwork that the rest of the company relies on. We oversee shared infrastructure, core services, and developer tools that enable product teams to innovate swiftly without compromising quality. Although our work often occurs behind the scenes, its effects are ubiquitous—enhancing reliability, scalability, security, and the overall developer experience.We tackle complex, systemic challenges, make informed trade-offs, and hold ourselves accountable for the platform's long-term health. If you value leverage, clean abstractions, and building robust systems, we want to hear from you!

⭐ About UsLodgify is a dynamic and rapidly growing scale-up at the forefront of the vacation rental industry. With $30M in funding, our innovative platform empowers property owners and managers globally to effectively manage and expand their businesses through advanced technology solutions.Based in the vibrant city of Barcelona, our diverse team of over 380 professionals hailing from more than 60 nationalities is dedicated to revolutionizing the future of short-term rentals.⭐ Role OverviewWe are excited to invite a Senior Frontend Engineer to join our thriving multicultural startup. In this role, you will enhance and maintain our existing frontend application built with React. You will engage in more than mere coding; you will collaborate closely with teams to create a product that our users truly cherish. You will take full ownership of your projects, from the initial brainstorming sessions through to deployment and beyond. We seek an innovative thinker who is eager to interact with customers, analyze usage data, and prioritize solutions to key challenges.

Axiomatic AI offers a Software Engineering Internship focused on Platform and DevOps. This position is available in Boston, US or Castelldefels (Barcelona), Spain. Role overview Interns will join experienced engineers to support platform reliability and efficiency. The work centers on refining development workflows and deployment processes. Projects often involve applying artificial intelligence to practical challenges. What you will do Collaborate with engineers to enhance platform performance Assist in improving development and deployment pipelines Contribute to initiatives that use AI in real-world applications Internship experience Direct involvement with current platform and DevOps methods Insight into active AI projects Work closely with a knowledgeable engineering team

About seQuraseQura is at the forefront of innovative payment solutions, enabling merchants to enhance customer acquisition, conversion, and retention seamlessly.Our tailored solutions cater to diverse sectors including Retail, Education, Optics, and Travel, making significant strides in sales performance. We empower consumers with smart shopping options that offer value, convenience, and flexibility, providing new payment experiences that enable savings, access to interest-free credit, and manageable installment plans of up to 24 months.Founded in the vibrant city of Barcelona, seQura is a privately-owned fintech in a dynamic scale-up phase. With a presence in Southern Europe and Latin America, we are experiencing remarkable growth, achieving over 50% CAGR and exceeding 100 million in Annual Recurring Revenue. Our reputation is bolstered by the trust of over 5,000 businesses and 2 million shoppers, with an impressive NPS of 87%, a Trustpilot rating of 4.5/5, and a Glassdoor rating of 4.3/5.About the Role We are seeking a seasoned Senior Data Platform Engineer to join our Data Platform team, where you will play a critical role in scaling seQura’s data ecosystem through innovative automation, robust platform capabilities, and intuitive self-service tooling.Your primary mission will be to advance our Data Platform as a Product, empowering software engineers, analysts, data scientists, and business teams to harness data effectively throughout its lifecycle—from ingestion to discovery—while embedding security, governance, and reliability into the platform by default. You will enable teams across the organization to access trusted data and make informed, data-driven decisions.This position extends beyond merely constructing data pipelines; you will be responsible for designing the guardrails, abstractions, and platform capabilities that facilitate other teams in building and scaling their own data products safely and efficiently.You will thrive in our cloud-native AWS environment, where Infrastructure as Code, observability, and automation are foundational engineering principles.Challenges You'll Tackle ...

Discover OktaAt Okta, we are redefining security and identity management, empowering individuals to use any technology, on any device, anywhere. Our versatile products, including the Okta Platform and Auth0 Platform, ensure secure access and authentication, embedding identity at the heart of business security and scalability.We embrace diverse perspectives and experiences. We seek lifelong learners who can contribute their unique insights to enhance our team.Be part of our vision! Join us in creating a world where identity is truly yours.As a Staff Software Engineer, you will take on the role of a technical leader and architect for our backend systems. Your responsibilities will include defining the technical vision for our platform, mentoring senior engineers, and tackling complex challenges related to scalability and reliability. Your influence will be critical in establishing engineering practices and architectures that empower teams to deliver high-quality software on a global scale.

Docplanner is looking for a Senior Platform Engineer to join the AI Platform Team. This fully remote position is open to candidates based anywhere in Spain. Role overview This role focuses on building and maintaining the core platform that supports Docplanner’s AI-driven healthcare solutions. The AI Platform Team plays a key part in enabling products that help patients connect with healthcare providers and assist doctors in managing appointments more efficiently. About Docplanner With over 12 years in the healthcare technology space, Docplanner (also known as Doctoralia in some countries) serves more than 90 million patients each month across 13 countries. Over 300,000 specialists use Docplanner’s tools to improve patient care. The company is backed by investors such as Point Nine Capital, Goldman Sachs Asset Management, and One Peak Partners. The global team numbers over 2,500 people, combining the reach of a large company with the spirit of a startup. Our Tech Team More than 400 professionals in Engineering, Data, and Product work together to deliver and maintain Docplanner’s platform. Many team members have grown their careers here for years, and new colleagues are welcomed with genuine enthusiasm. To learn more about the team and culture, visit the Docplanner Tech site, check out Glassdoor reviews, or watch this video. Work environment Every team member at Docplanner can make a direct impact on how people experience healthcare. The company values individuality and encourages everyone to bring their authentic selves to work. The engineering team operates fully remotely within Spain, giving each person the flexibility to choose their ideal work environment.

About ExoticcaExoticca is an innovative online travel agency that is transforming the way people envision, create, and purchase unforgettable long-distance journeys. Our core mission revolves around the principle of 'creating life milestones.' We are dedicated to offering exceptional value trips, uncovering unique destinations, and curating extraordinary travel experiences, all while showing unwavering care for our customers and the environment.As a rapidly growing, professional, and multicultural team, we are eager to welcome new partners who share our vision in building the most progressive travel company of our generation.Your RoleWe invite you to become a proactive Senior Frontend Engineer who is passionate about crafting high-quality, maintainable code. You will leverage modern tools, including AI, to enhance productivity and efficiency. Your contributions will help us deliver superior frontend experiences, marrying robust engineering principles with a results-driven approach.Key Responsibilities:Develop and deliver high-quality frontend code that is clear, maintainable, and ready for production, guiding features from concept to deployment.Utilize AI-driven tools judiciously for tasks such as prototyping, refactoring, testing, and documentation to accelerate delivery without sacrificing code integrity.Engage in Growth experiments and iterations, facilitating rapid feedback cycles, A/B testing, and continuous enhancement.Collaborate closely with Backend, Product, and Design teams to ensure seamless interfaces, excellent user experiences, and collective accountability for results.Maintain a healthy codebase by refining existing components, addressing technical debt, and elevating quality standards where necessary.Mentor team members through code reviews and knowledge sharing, leading by example and fostering improvement in their skills.

Join our exceptional team of developers in beautiful Barcelona, where you can enjoy ocean views from your workspace! As a Senior Front End Software Engineer, you will play a crucial role in designing the user interface of our award-winning FX platform, collaborating closely with our UX, Product, and Tech teams.We are looking for a skilled developer who is proficient in frameworks such as Angular, React, Vue, or similar technologies and is eager to dive into the world of Ember. Previous experience with Ember is not required, as we are committed to providing you with the necessary resources and support to excel in this area, with the potential for you to teach us along the way!Your responsibilities will extend beyond working with Ember. We are actively developing a platform-agnostic component library using Stencil.js and web components, aimed at creating reusable components that can be integrated seamlessly across our growing UI ecosystem. This ecosystem includes frameworks like Ruby on Rails (RoR), Phoenix, and others that we plan to adopt. Our backend primarily utilizes Ruby on Rails, with additional services crafted in Elixir (Phoenix) to manage specific functionalities.At Kantox, we foster a culture of self-motivation and continuous growth. We encourage questions and view mistakes as valuable learning experiences. With a flat management structure, we trust in the expertise and contributions of every team member. You will be part of a highly motivated, diverse, and multidisciplinary team that considers software development to be a collaborative sport.Your mission within KantoxAs a Senior UX/Front-End Developer, your main objective will be to guarantee seamless and intuitive user interactions within our platform. You will work closely with the UX team during daily Stand-Up Meetings (SUMs) to ensure alignment on our shared vision. In this role, you will provide support to the team lead, offering guidance and mentorship to junior and mid-level engineers. Active participation in collaboration with product, QA, and other technical teams will be necessary for reviewing requirements, drafting specifications, and coordinating development and releases. We are looking for a candidate who shows the potential to eventually step into the role of Tech Lead.While English is the primary working language, our multicultural environment often features Spanish, Catalan, French, Russian, Italian, Bulgarian, and many other languages in common areas. A background in finance is not required, as we provide comprehensive training to help you understand our platform and its underlying processes.

As a Senior Backend Software Engineer at Blacklane, you will join one of our autonomous agile teams. Your contributions will enhance the services that drive our innovative platform, improve our back-office systems, and address integration challenges that enable our business partners to seamlessly connect with Blacklane.Our tech stack comprises Ruby, Go, TypeScript, and Java services, designed through Domain-Driven Design (DDD). These services are deployed within our Kubernetes cluster and communicate via domain events using SQS and Kafka. We utilize a variety of data storage technologies, including PostgreSQL, MySQL, Elasticsearch, Redis, and DynamoDB. For infrastructure and cloud resources, we primarily leverage AWS, managing provisioning through Terraform.

About the Role Affinity is hiring a Senior Software Engineer in Barcelona. This position focuses on designing, building, and maintaining software products that support the company's goals. The team values engineers who enjoy solving complex problems and contributing to ongoing projects.

About UsPerk Technologies, Inc. (formerly TravelPerk) is revolutionizing the landscape of travel and spend management with our cutting-edge platform. Our mission is to eliminate the tedious, manual tasks that hinder productivity, allowing businesses to focus on what truly matters. We automate processes related to travel bookings, expense management, invoice processing, and much more. By addressing the significant issue of shadow work that leads to lost hours and diminished morale, we empower employees to achieve their best work.Trusted by over 10,000 organizations globally, including industry leaders such as Wise, On Running, Breitling, and Fabletics, we are addressing a staggering productivity loss of 7 hours per employee each week, representing a $1.7 trillion challenge.Founded in 2015, Perk has rapidly expanded into a global entity with more than 1,800 employees distributed across 12 offices worldwide, with headquarters in London and Boston. We prioritize innovation, control, and simplicity to transform the working experience for businesses and their employees.At Perk, our values drive us. We believe in ownership, delivering a 7-star experience, and collaborating as one team. Our focus is on curiosity, purpose, and mindset, rather than just knowledge, to unlock your full potential. Our talent team is composed of top professionals from the travel and SaaS sectors, representing over 70 nationalities. If you are passionate about making a real impact and redefining how millions experience work, we would love to welcome you to our team.Visit www.perk.com to learn more.