Software Engineer - Java / Kotlin at vonage | Barcelona

Join our dynamic team at Vonage as a Software Engineer specializing in Java and Kotlin. You will be responsible for designing, developing, and maintaining robust software applications that enhance our communication services. We are looking for innovative thinkers who are passionate about technology and eager to contribute to cutting-edge projects.

Join Delivery Hero as a Senior Backend Engineer specializing in Kotlin to drive innovation in the Quick Commerce sector. In this role, you will design and develop scalable backend systems that enhance our delivery capabilities. You will collaborate with cross-functional teams to deliver high-quality software solutions while ensuring optimal performance and reliability.We are looking for someone who is passionate about technology, thrives in a fast-paced environment, and is eager to take on new challenges. Your contributions will directly impact our mission to provide exceptional service to our customers.

Join our innovative team as a Senior Software Engineer, where you will be responsible for developing high-throughput services using technologies such as Node.js, TypeScript, Kotlin, or Java with frameworks like Spring Boot or Micronaut.You will leverage cutting-edge AI tools (e.g., GitHub Copilot, Cursor, Claude code) to streamline development processes and foster a culture of best practices within the team.Take ownership of the Software Development Life Cycle (SDLC) by utilizing Infrastructure as Code (IaC) with Terraform to implement blue-green deployments and manage preview environments.Engage in continuous performance tuning, profiling latency, cost, and overall system performance.Design and implement LLM-powered features and agents using LangChain or MCP-compliant frameworks, ensuring effective integration of retrieval, memory, and tool-use patterns.Promote clean code principles and domain-driven design while mentoring peers through constructive pull request reviews.Identify and propose solutions for scaling challenges, performance bottlenecks, and potential security vulnerabilities.

The TransPerfect TechOps team has played a crucial role in our company's journey over the past decade, providing innovative technology and services that significantly enhance the experiences of our clients and team members alike. From streamlining workflows to establishing essential services that underpin our GlobalLink platform, we are dedicated to creating scalable client interfaces that empower users to navigate intricate ecosystems effortlessly.To learn more about our solutions, please visit: https://globallink.transperfect.com/Note: When applying, please submit your CV in English.This position offers:A pivotal role within a vibrant QA team, part of a technology division in the world’s leading provider of language services and technology solutions.An opportunity to significantly influence product testing, direction, and development.Collaboration with colleagues across the globe in a cross-functional team environment.

haufegroup seeks a Senior Back-End Software Engineer with advanced Java expertise to join the Barcelona team. The role centers on building scalable systems that power digital transformation projects for clients. Role overview Design and develop reliable, scalable back-end solutions using Java Collaborate with colleagues from various disciplines to deliver quality products Mentor junior developers and support their technical growth Requirements Extensive experience building back-end systems with Java Ability to work well in cross-functional, collaborative teams Interest in mentoring and sharing knowledge Located in or open to relocating to Barcelona Location This position is based in Barcelona.

Join our dynamic team at Delivery Hero as a Senior Backend Engineer specializing in Kotlin. In this role, you will be pivotal in shaping our quick commerce solutions, ensuring seamless and efficient backend processes that cater to our growing customer base.Your expertise will help us innovate and enhance our platform, working closely with cross-functional teams to deliver high-quality, scalable solutions. If you are passionate about backend technologies and eager to make a significant impact in a fast-paced environment, we want to hear from you!

Role Overview haufegroup is hiring a Senior Software Engineer with strong Java experience for its Barcelona office. This role focuses on building and maintaining high-performance software that supports client requirements and drives product improvement. What You Will Do Design, develop, and maintain Java-based software solutions Work closely with cross-functional teams to enhance existing products Contribute to technical decisions and ongoing improvements Location This position is based in Barcelona.

About UsPerk, formerly known as TravelPerk, is a cutting-edge platform dedicated to revolutionizing travel and spend management. We streamline cumbersome manual tasks, providing automated solutions for travel bookings, expense management, invoice processing, and beyond. Our mission is to eliminate inefficiencies, helping businesses reclaim valuable time and boost employee morale while fostering innovation.Trusted by over 10,000 companies worldwide, including industry leaders like Wise, On Running, Breitling, and Fabletics, we are addressing the staggering issue of lost productivity—estimated at $1.7 trillion—by tackling the 7 hours of wasted time each employee faces weekly. Established in 2015, Perk has rapidly expanded to a global workforce of more than 1,800 individuals across 12 offices, with headquarters located in London and Boston. We blend innovation, control, and simplicity to transform workplace dynamics and improve employee experiences.Our values drive us—ownership, a commitment to delivering a 7-star experience, and teamwork are at our core. We prioritize curiosity, purpose, and a growth mindset over mere knowledge, ensuring our team members reach their full potential. Our talent pool comprises top professionals from the travel and SaaS sectors, representing over 70 countries. If you're passionate about making a real difference and enhancing the work experience for millions, we want you on our team.Explore more about us at www.perk.com.

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 the Role Sopra Steria is hiring a Java Developer for its Barcelona office. This position focuses on building and improving software applications with Java technologies. The team works on a range of projects for clients across Europe. What You Will Do Develop new applications using Java Enhance and maintain existing software solutions Collaborate with colleagues to solve technical challenges Contribute ideas to improve project outcomes Who We’re Looking For Interest in technology and software development Strong problem-solving skills Comfort working in a collaborative setting Commitment to delivering quality software This role is based in Barcelona and offers the chance to work with a leading European tech consulting firm on meaningful projects.

About Us:Are you ready to make a difference? Join our passionate team at Rover, where work meets play!At Rover, we believe that everyone should experience the unconditional love of a pet. Since our founding in 2011, we have dedicated ourselves to connecting pet parents with caring pet sitters and dog walkers through our innovative app and website. Our platform spans neighborhoods across the US, Canada, and Europe, empowering a community of trusted pet care professionals to build their own businesses with the support of a global organization.Headquartered in Seattle, Washington, we collaborate closely with our vibrant teams in Barcelona, San Antonio, Spokane, and remote locations. Recognized as one of the best places to work, Rover has earned accolades from Seattle Business Magazine and Puget Sound Business Journal. As a fast-growing, agile company, our leadership team is comprised of veterans from some of the world's most esteemed tech companies.At Rover, pets are valued as much as our human team members. We strive to enhance the joys of pet ownership while nurturing a diverse, inclusive, and welcoming environment for our employees.This is a full-time, permanent, hybrid role (Mondays & Thursdays in our office at Poblenou, Barcelona).Software Engineer PositionAre you a dedicated and detail-oriented Software Engineer eager to leverage your technical expertise to develop customer-centric products that enhance the lives of pet owners? We are seeking an enthusiastic engineer to join our Barcelona team.In this role, you will be a vital contributor to our platform, working alongside cross-functional teams to solve complex technical problems and deliver robust, scalable solutions. If you are passionate about honing your craft and contributing to a supportive community, we would love to hear from you!

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.

About G2 - The CompanyG2 stands as the largest and most reputable software marketplace globally. By joining G2, you become a part of a leading team dedicated to empowering businesses with reliable insights and strategies derived from real software users, helping them to maximize their potential.In an exciting development, we have collaborated with Capterra, SoftwareAdvice, and GetApp to create a comprehensive online resource for software data and insights. With over 200 million annual visitors and 6 million verified reviews, we have established ourselves as the go-to platform for software buyers, enabling them to make informed and swift decisions.We're just beginning our journey! Our mission is to revolutionize the global B2B software landscape and establish a trusted data foundation for both software buyers and sellers in the AI era.Are you excited? Join us as we strive to reach our next peak!About G2 - Our PeopleAt G2, our identity and actions are rooted in our PEAK values— (Performance + Entrepreneurship + Authenticity + Kindness). Being part of G2 means engaging with a value-driven, global community that climbs peaks together. We celebrate each other's victories, learn from setbacks, and provide support during challenging times. Our ambition and entrepreneurial spirit encourage us to tackle challenging projects that foster growth and learning.You will join a diverse, global team of intelligent, dedicated, and kind individuals, each with unique talents and aspirations. Central to our culture are our people-led ERGs, which celebrate the diverse identities within our team. We are committed to our DEI and philanthropic initiatives (such as our G2 Gives program), which inspire us to become better individuals.

Join cint as a Senior Software Engineer and play a vital role in shaping the future of our technology. In this dynamic position, you will be responsible for designing, developing, and maintaining high-performance software systems that enhance our products and services.We are looking for a passionate individual with a strong foundation in software engineering principles who is eager to collaborate within a team-oriented environment. Your contributions will directly impact our innovative solutions and drive the success of our company.

About Us: At Emburse, we don’t just envision the future—we actively create it. As a frontrunner in travel and expense management solutions, we are dedicated to harnessing the power of technology to deliver exceptional business value and inspire remarkable outcomes. Our AI-driven platform empowers organizations to modernize their financial operations, enhance visibility, and optimize expenditures across the entire enterprise.We are seeking a dedicated and skilled software engineer to join our dynamic team at Emburse. In this senior role, you will play a pivotal part in developing a cohesive and interactive suite of system solutions. Collaborating within an agile development team, you will be responsible for building and refining features of our Enterprise product.

About Prosper AIProsper AI is at the forefront of innovation, specializing in AI Phone Agents designed for the healthcare sector. Our mission is to deliver human-like expertise while dramatically reducing operational costs. Our AI Agents efficiently manage a variety of tasks such as patient outreach, claims status inquiries, benefit verifications, prior authorizations, scheduling, and balance reminders. We are dedicated to eliminating $200 billion in administrative waste, enabling healthcare professionals to devote more time to patient care instead of administrative duties.Your RoleJoin us at Prosper as we redefine the capabilities of real-time AI technology. As a Software Engineer, your primary focus will be on designing and scaling our robust platform, including low-latency speech and LLM pipelines, orchestration layers, and reliability systems that empower our AI voice agents to engage in complex healthcare conversations with clarity and efficiency. This position is a full-time, on-site opportunity based in Barcelona with the potential for relocation to our New York office.Qualifications1-3 years of hands-on experience in developing end-to-end software solutions, from architecture to deployment.Proficiency in technologies that drive our stack, particularly FastAPI (Python) for backend development and React (TypeScript) for frontend.Experience in managing large-scale distributed systems with asynchronous workload orchestration.Familiarity with LLMs, AI agents, or other machine learning models is advantageous; we utilize Pipecat for our voice agents.A founder mindset: take ownership and work diligently, viewing Prosper as a stepping stone to your future entrepreneurial endeavors.Prepared to tackle the complexities of deploying AI voice agents for thousands of daily calls.Bachelor’s or Master’s degree in Computer Science, Engineering, Mathematics, Physics, or a related field (or equivalent experience).Interview ProcessInitial conversation to discuss your background, aspirations, and career goals (30 minutes).Completion of a take-home challenge to be reviewed in the subsequent interview.Discussion of your solution with our engineering team to evaluate your approach and thought process.

Join our dynamic team as a Fullstack Engineer specializing in Java and Angular. In this role, you will be responsible for designing and implementing robust software solutions that enhance user experiences and meet our clients' needs. Collaborate with cross-functional teams to drive innovation and ensure the successful delivery of projects.

About SumUp At SumUp, we champion the everyday hero—the small business owner. Our mission is to empower these individuals by providing innovative tools that simplify the management of their businesses. With a founder’s mindset and a commitment to teamwork, our diverse teams across Europe, South America, and the United States collaborate to help our partners succeed in their passions. Team Description The Lending team is dedicated to delivering a fair, straightforward, and timely lending experience for small merchants. We enable small business owners to take control of their financing, whether they are looking to fund growth, manage cash flow, or cover operational expenses. Our goal is to ensure that capital is accessible to our merchants and consumers at all times. We are on the lookout for talented Engineers to enhance and maintain the backend of a crucial aspect of our lending operations: Dunning & Collection. This process involves engaging with our merchants, developing repayment plans, and offering alternative payment solutions to help our customers meet their financial commitments to SumUp. Your responsibilities will include designing, implementing, and testing new features, as well as optimizing the performance and scalability of our existing systems. What You’ll Do Enhance the functionality and user experience of SumUp’s lending platform to meet the diverse needs of our merchants. Design and build new microservices for various use cases in the Dunning & Collection journey, taking into account market-specific nuances. Optimize system performance and scalability. Develop integrations with external partners to fuel growth. Contribute to building a high-performing engineering team. You’ll Be Great for This Role If 1-3 years of experience as a Software Engineer. Proficiency in Golang or other object-oriented programming languages such as Java, Kotlin, or Python. Experience in creating and maintaining simple components in React. Familiarity with RESTful API design and development. Proficient in Git and Git workflows. Experience with SQL and NoSQL databases, including PostgreSQL. It Would Be a Plus If You Have Strong English communication skills for effective collaboration.

About Thunes Thunes is revolutionizing the way money moves across the globe. Our unique Direct Global Network enables Members to execute real-time payments in over 130 countries and across more than 80 currencies. With direct connections to over 7 billion mobile wallets and bank accounts worldwide, we facilitate transactions through 350+ payment methods, including GCash, M-Pesa, Airtel, MTN, Orange, JazzCash, Easypaisa, AliPay, WeChat Pay, and many others. Our network supports industry leaders in the gig economy such as Uber and Deliveroo, super-apps like Grab and WeChat, as well as MTOs, fintechs, PSPs, and banks. Thunes stands out with its extensive global reach, an innovative Smart Treasury Management Platform, and a robust Fortress Compliance Infrastructure, providing unparalleled speed, control, visibility, protection, and cost-effectiveness for real-time global payments. Headquartered in Singapore, we have a presence in 12 cities worldwide, including Barcelona, Beijing, Dubai, London, Manila, Nairobi, Paris, Riyadh, San Francisco, Sao Paulo, and Shanghai. For further details, please visit: https://www.thunes.com/ Role Overview As a Golang Software Engineer at Thunes, you will take charge of designing, developing, and maintaining high-quality software solutions within the Golang ecosystem. Your success will be measured by your ability to deliver efficient, scalable, and maintainable code while fostering collaboration with cross-functional teams. Reporting directly to the Lead Developer, you will play a pivotal role in shaping the technical trajectory of our projects and ensuring compliance with best coding practices. This role is integral to enhancing our technological capabilities and driving our business objectives through robust software development. Key Responsibilities: Develop, test, and deploy applications with a focus on performance and security. Contribute to the development of a new platform version using Golang. Work collaboratively with Product Owners, the Security and Infrastructure team, and the Data team to implement effective technical solutions. Conduct code reviews, providing constructive feedback to uphold best practices and code quality. Optimize application performance and scalability while addressing technical debt as necessary. Engage in Agile development processes, contributing to sprint planning, stand-ups, and retrospectives. Troubleshoot and resolve software issues to maintain system stability and reliability. Stay informed about emerging technologies and suggest enhancements to current solutions.

About Thunes Thunes is revolutionizing the global money transfer landscape with its innovative Direct Global Network, enabling seamless real-time payments across over 130 countries and 80 currencies. Our network offers direct connections to more than 7 billion mobile wallets and bank accounts globally, alongside access to 15 billion cards through over 320 different payment methods including GCash, M-Pesa, Airtel, MTN, Orange, JazzCash, Easypaisa, AliPay, WeChat Pay, and many more. Thunes uniquely stands out with its expansive reach, advanced SmartX Treasury System, and robust Fortress Compliance Platform, providing network members with unparalleled speed, control, visibility, protection, and cost-effectiveness for real-time payments worldwide. Our prestigious clientele includes industry leaders such as Uber, Deliveroo, Grab, and WeChat, along with various fintechs, MTOs, PSPs, and banks. Headquartered in Singapore, Thunes operates in 14 global locations including Barcelona, Abidjan, Beijing, Dubai, Hong Kong, Johannesburg, London, Manila, Nairobi, Paris, Riyadh, San Francisco, and Shanghai. For more details, please visit: https://www.thunes.com/ Role Overview We are seeking a passionate Senior Software Engineer (Golang) to join our dynamic Engineering team in Barcelona. This role offers an exciting opportunity to work in the fast-paced FinTech sector, collaborating on a variety of projects and technologies within an innovative environment. The Engineering team is tasked with developing our core business products and deploying them efficiently. We design solutions, tools, and platforms that address business needs, focusing on provisioning, configuration, CI/CD, monitoring, SLA, performance, and uptime. Our meticulous approach ensures we closely collaborate with diverse stakeholders while managing millions of transactions and integrating numerous global partners.