Backend Engineer for AI Integration

Role Overview airapps is hiring a Backend QA Engineer based in Madrid. This position focuses on quality assurance for backend systems, helping to keep applications reliable and up to standard. What You Will Do Support QA processes for backend applications Work closely with team members to identify and resolve issues Help ensure applications perform as intended and meet quality expectations Who We’re Looking For Detail-oriented approach to testing and problem-solving Comfortable working within a collaborative team Motivated to deliver solid, dependable software Location This role is based in Madrid.

Join Aircall, a unicorn and AI-driven customer communications platform, serving over 22,000 companies globally. We are innovating the way businesses communicate by seamlessly integrating voice, SMS, WhatsApp, and AI into a unified workspace.Our growth stems from a straightforward principle: empower teams to work more efficiently. Our AI Voice Agent automates routine calls, AI Assist enhances post-call tasks, and AI Assist Pro provides real-time support, enabling individuals to excel in their roles. This leads to increased revenue, quicker resolutions, and confident team scalability.With headquarters in Paris and a robust North American presence in Seattle, alongside teams in Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City, we have developed a beloved product and a rapidly expanding business, supported by top-tier investors and driven by swift AI advancements across various product lines.At Aircall, you will be part of a dynamic organization. We are ambitious, focused on product excellence, and committed to execution, ensuring visible impacts, quick decisions, and genuine growth.Our Work Culture: We are deeply customer-focused, data-informed, and dedicated to delivering significant outcomes. We prioritize ownership, ongoing learning, and a thoughtful pace. If you thrive in a collaborative, fast-paced setting where trust and impact are key, you will feel right at home here.Role Overview:As a Senior Backend Software Engineer, you will play a crucial role in designing, developing, deploying, and maintaining essential features that enhance customer value through voice integration.You will be expected to advocate for best practices and provide mentorship within your team and across the engineering department.We are driven by quality, excellence, and agility, and you will contribute to elevating these standards.Utilizing a diverse range of backend technology stacks, tailored to meet specific needs and consistently hosted on AWS, we create resilient services that add value to voice integration and seamlessly connect with our clients' critical business tools such as CRM, Helpdesk, E-Commerce, and more.

Managing expenses shouldn’t be a headache. At Pleo, we’re revolutionizing the way businesses handle spend management by creating solutions that simplify financial processes for both finance teams and employees. Our goal is to empower organizations to 'go beyond' traditional methods.Since our inception 10 years ago, we’ve embraced the philosophy of ‘Pleo’, meaning ‘more than you’d expect’, which has been pivotal to our success.We are currently at a significant juncture in our growth journey; every decision we make affects our more than 40,000 customers, our business, and our collective achievements. We are looking for individuals who take pride in identifying customer needs, transforming complex challenges into straightforward solutions, and respectfully challenging the status quo. With our ambitious goals ahead, we are a dynamic and diverse team of over 850 individuals from more than 100 nationalities, dedicated to shaping the future of business spending.About the RoleWe are seeking a skilled Backend Engineer to join our innovative team at Pleo. In this position, you will play a crucial role in building and scaling our backend systems, engaging in exciting projects as we expand our product and service offerings. If you are passionate about solving intricate technical challenges and thrive in a culture that values transparency, collaboration, and innovation, we invite you to apply.What You’ll Be DoingAs a Backend Engineer, your responsibilities will include:Designing, building, and maintaining scalable microservices primarily using Kotlin.Collaborating with cross-functional teams to develop innovative solutions across various domains such as Platform, Services, and SMB.Analyzing system performance and implementing optimizations to ensure high reliability and scalability.Participating in code reviews and post-mortems while mentoring fellow engineers.Proactively addressing technical debt and guiding the team through challenges and migrations.What You BringThis role is ideal for you if you possess:Experience in server-side languages, particularly Kotlin, along with expertise in distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes).Proficiency with relational databases such as PostgreSQL and familiarity with testing frameworks (e.g., JUnit, Testcontainers).

About the Role airapps is looking for a Backend Engineer in Madrid to help shape the systems behind our platforms. This role centers on building and improving backend architecture that supports our applications. What You Will Do Design, implement, and maintain scalable backend systems Work closely with teams across the company to deliver new features and solutions Contribute to the ongoing improvement of our backend platforms Location This position is based in Madrid.

Interactiv4 is seeking a highly skilled Senior QA Engineer to join our dynamic teams in Madrid or Barcelona. The ideal candidate will possess extensive expertise in Quality Assurance and the ability to define and implement effective QA strategies for our diverse projects.Key Responsibilities:Understand, implement, and continuously update the QA strategy.Collaborate with team members to establish acceptance criteria and definitions of done for user stories.Develop comprehensive test plans based on user stories and draft test cases for acceptance testing.Estimate, prioritize, plan, and coordinate testing activities.Ensure the testing team effectively utilizes testing tools.Design, develop, and execute automation scripts.Conduct manual and automated testing of the system against both functional and non-functional requirements.Log defects and collaborate with developers for resolution.Perform regression testing post-bug fixes.Provide coaching to QA testers within the team.Ensure testing activities are included in iteration planning and production releases.Qualifications:Experience in developing and automating testing plans for eCommerce projects.Knowledge of various testing levels: unit, integration, and end-to-end.Experience managing quality improvement plans.Proficient in load/stress testing in production environments.Experience with API and frontend testing.Ability to create test plans and generate reports during development cycles.Skilled in defining acceptance criteria for user stories.Preferred Qualifications:Familiarity with the Magento eCommerce platform.Experience with performance testing tools such as Selenium, Jenkins, and Xray.Previous experience as a developer is a plus.Knowledge of data handling and data quality practices.Experience in building continuous integration and continuous delivery workflows.Ability to train teams on quality concepts.

As a Senior Backend/Platform Engineer at causaprima, you will be responsible for the foundational platform utilized by our agents. Your expertise will enhance our event-driven architecture, streamline data pipelines, integrate with customer accounting systems, and ensure that our infrastructure is reliable, auditable, and efficient.Key ResponsibilitiesEvent Store Management — Design and maintain an append-only PostgreSQL database featuring tamper-evident hash chaining, real-time event distribution, agent replay, recovery capabilities, and schema versioning.Cryptographic Signature Infrastructure — Establish key management and signature verification systems for all agent events while implementing approval chains for external actions.Workflow Constraint Engine — Develop a gateway to verify authorization for any external actions including emails, payments, or API calls.PII Vault & GDPR Compliance — Create isolated, encrypted storage solutions for personal data, ensuring compliance with the right to erasure and data residency requirements.Multi-Tenancy Management — Implement row-level security and tenant isolation across all data stores, including tenant-scoped LLM API keys.Authorization Framework (Cerbos) — Utilize attribute-based access control for both agents and humans, ensuring deterministic policy evaluation where LLMs do not make authorization decisions.MCP Security Layer — Develop authentication, capability-based scoping per partner, and rate limiting for the Model Context Protocol endpoint.Database Architecture — Focus on PostgreSQL schema design, indexing strategies, performance tuning, and read replica topology.

About Air Apps Air Apps builds AI-powered planning tools for individuals and entrepreneurs. Founded in Lisbon in 2018, the company has grown to offices in Lisbon and San Francisco and reached over 100 million downloads worldwide. As a self-funded, family-founded business, Air Apps focuses on long-term impact and practical solutions that help people manage resources and plan more effectively. QA Automation Engineer – Madrid (Onsite) The QA Automation Engineer will play a key role in developing and maintaining automated testing frameworks and regression test suites. This work helps ensure the quality, stability, and performance of Air Apps’ products across both web and mobile platforms. Collaboration is central to the role. The QA Automation Engineer will work closely with developers, product managers, and other QA professionals to design and implement automated testing strategies, increase test coverage, and improve the efficiency of the testing process. What You Will Do Develop and maintain automated test frameworks and regression suites Work with cross-functional teams to implement effective automated testing strategies Enhance test coverage and improve testing efficiency for web and mobile applications Help ensure the stability, performance, and reliability of Air Apps’ products Work Location and Relocation Support This is a fully onsite position in the Madrid office Relocation assistance is available for qualified candidates

Join the Digital Revolution!At Aleph, we are not just participating in the digital advertising landscape; we are actively shaping its future. As representatives of the world’s leading platforms, including TikTok, Amazon, Google, and nearly 55 others, we operate across 130+ markets worldwide.Our mission is to empower advertisers and brands to harness the full potential of these platforms' advertising capabilities. By nurturing long-term partnerships, we create limitless opportunities for businesses to advertise effectively at both local and global levels.With a presence spanning multiple continents, Aleph offers you the opportunity to join a rapidly growing and innovative team where your contributions will have a direct impact. If you are ambitious, forward-thinking, and eager to thrive in a dynamic global environment, Aleph is the ideal place to advance your career.We are looking for a talented Senior Backend Developer who excels in designing, building, and maintaining high-throughput, event-driven systems. In this pivotal role, you will be instrumental in shaping our core platform, making vital architectural decisions, and mentoring fellow engineers. Your responsibilities will include ensuring reliable communication between our asynchronous services, facilitating seamless data flows, and enabling our entire ecosystem to scale according to demand. If you are passionate about message queues, stream processing, and the intricacies of distributed systems, we invite you to apply for this exciting opportunity.

Join Aircall as a Senior Backend/Platform Engineer, where you will play a crucial role in enhancing our platform's infrastructure and backend systems. You will collaborate with cross-functional teams to design and implement scalable solutions that ensure seamless communication for our users. If you are passionate about crafting high-performance systems and thrive in a dynamic environment, we would love to hear from you!

Managing corporate spending can often be a challenging endeavor, with convoluted processes that hinder efficiency for finance teams and employees. At Pleo, we are revolutionizing this process. We provide financial solutions designed to simplify money management, making it seamless and remarkably efficient for everyone involved. Our mission is to empower businesses to 'go beyond' traditional spending methods.The name 'Pleo' translates to 'more than you’d expect', and this philosophy has underpinned our success over the last decade.We find ourselves at a crucial juncture in our growth; every decision we make impacts over 40,000 customers and is vital to our mutual success. We seek individuals who are committed to understanding customer needs, transforming complex challenges into straightforward solutions, and questioning the status quo—all while aiming high. With ambitious goals propelling us forward, we embrace the journey of discovery and innovation. Our team consists of over 850 talented individuals representing more than 100 nationalities, all dedicated to shaping the future of business spending.About the RoleWe are in search of a Senior Backend Engineer to join our dynamic team at Pleo. In this role, you will play a key part in developing and scaling our backend systems while engaging in exciting projects as we enhance our product and service offerings. If you are passionate about tackling complex technical challenges and thrive in a culture that prioritizes transparency, collaboration, and innovation, this position is made for you.Your ResponsibilitiesAs a Senior Backend Engineer, you will:Lead the design, development, and maintenance of scalable microservices primarily using Kotlin.Collaborate with cross-functional teams to create innovative solutions across various domains including Platform and Services.Analyze system performance and implement optimizations to ensure high reliability and scalability.Participate in code reviews, conduct post-mortems, and mentor fellow engineers.Proactively address technical debt and guide the team through technical challenges and migrations.QualificationsYou will excel in this role if you possess:Strong expertise in server-side programming, particularly in Kotlin, and experience with distributed systems, microservices, and various cloud environments such as AWS and Kubernetes.Proficiency in relational databases such as PostgreSQL, testing frameworks (e.g., JUnit, Testcontainers), and observability tools like Grafana.

airapps is looking for a Backend DevOps Engineer based in Madrid. This position focuses on improving development workflows and supporting reliable application deployments. Role overview The Backend DevOps Engineer will work with both development and operations teams. The main goal is to make development processes smoother and ensure that applications are deployed efficiently. What you will do Collaborate with team members to implement continuous integration and continuous deployment (CI/CD) pipelines Manage and maintain cloud infrastructure Work to improve system performance and reliability Location This role is based in Madrid.

Join our innovative team as a Junior Software Engineer focused on backend development in .NET. You will play a crucial role in ensuring the quality, development, and execution of our software products.As part of our dynamic technology department, you'll collaborate with a diverse group of professionals from cities like Barcelona, New York, London, Manchester, Bucharest, and India. If you're eager to make an immediate impact in a growing company, we are excited to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been instrumental in our success for over a decade, delivering cutting-edge technology and services that enhance the workflow for our clients and colleagues. From optimizing our GlobalLink platform to creating user-friendly client interfaces, your contributions will help simplify complex systems for novice users.

neoris is looking for a Backend Software Engineer with a focus on .NET technologies to join the team in Madrid, Spain. This hybrid position involves both in-office and remote work. Role overview This role centers on designing, developing, and maintaining backend systems that support neoris applications. The work involves building reliable services and ensuring performance and scalability. Collaboration Work closely with colleagues from different disciplines to deliver software solutions that align with business objectives. Regular communication with cross-functional teams is part of the job. Location This is a hybrid role based in Madrid, Spain. Some days will be spent in the office, with flexibility for remote work.

Are you ready to make a significant impact? At Cabify, we are on a mission to transform urban living by enhancing mobility for residents, seamlessly connecting riders with drivers at their fingertips. Our vision is to create cities where private cars are a thing of the past. Are you interested in being part of this transformative journey? At Cabify, our commitment to diversity shapes our Product & Engineering teams. We actively seek talent from a variety of backgrounds, supporting initiatives such as Women Tech Dating and our Internal Diversity Committee. Our inclusive job descriptions reflect our dedication to an environment where every contribution is valued. Join us to be a part of innovative teams that truly mirror the diverse talent in the tech sector. With over 20 million users globally, we operate in 8 countries and 90 cities, rapidly adapting our product to maintain leadership in various markets while prioritizing sustainability. The Role: We are seeking a skilled Backend Software Engineer with experience in any backend technology. Your day-to-day tasks will involve working with Go, Elixir, or Ruby. Even if your background is primarily in languages like Java, we believe you can quickly adapt and learn new languages. What matters most to us is your adaptability and ability to learn programming languages swiftly. At Cabify, you will: Collaborate with principal engineers on development planning and architectural design. Coordinate subprojects, building and maintaining robust, testable, and data-driven applications. Enhance the reliability, scalability, and performance of our services. Take ownership of your code all the way to production utilizing a self-service continuous delivery pipeline. Engage in host-level problem-solving and contribute to improving detection methods. Be a key player in fostering our engineering culture, prioritizing quality through peer reviews, monitoring, and best practices.

Managing expenditures can be a complex and cumbersome task, but at Pleo, we're revolutionizing this space. Our innovative spend management solutions empower finance teams and employees to handle their finances effortlessly and effectively. With a mission to help businesses 'go beyond', we strive to simplify the way money is managed.Over the past decade, our mantra 'Pleo'—meaning 'more than you’d expect'—has driven our success and innovation.As we continue to expand our reach to over 40,000 customers, we seek individuals who are passionate about identifying customer needs, simplifying complex challenges, and ambitiously pursuing excellence. Join our diverse team of 850+ exceptional individuals from more than 100 nationalities, all committed to shaping the future of business spending.About the RoleWe are excited to invite a skilled Backend Engineer to our team at Pleo. In this pivotal role, you will contribute to the design and scalability of our backend systems while taking part in exciting projects as we enhance our product and service offerings. If you have a passion for tackling complex technical challenges and desire to work in an environment that values transparency, collaboration, and a strong commitment to innovation, this opportunity is for you.Your ResponsibilitiesAs a Backend Engineer, you will:Design, develop, and maintain scalable microservices primarily using Kotlin.Collaborate with cross-functional teams to create innovative solutions across various domains, including Platform, Services, and SMB.Evaluate system performance and implement optimizations to ensure reliability and scalability.Engage in code reviews, conduct post-mortems, and mentor junior engineers.Proactively manage technical debt and navigate the team through technical challenges and transitions.Your QualificationsTo excel in this role, you should possess:Proven experience in server-side programming languages, particularly Kotlin, alongside expertise in distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes).Strong proficiency with relational databases such as PostgreSQL, testing frameworks (e.g., JUnit, Testcontainers), and observability tools like Grafana.

Role overview SGS is seeking a DevOps Engineer to join the team in Madrid. The main focus of this role is to enhance continuous integration and deployment processes, aiming to make software delivery more reliable and efficient. What you will do Collaborate with colleagues from various departments to help achieve project objectives Automate tasks and processes to improve workflow efficiency Implement and maintain best practices for managing cloud infrastructure Who we’re looking for Engineers who enjoy solving problems and have a genuine interest in technology Team players who like working together and contributing to the success of projects This position is located in Madrid.

At Groupon, we are more than just a marketplace; we are a vibrant community where customers uncover delightful experiences and local businesses prosper. With over a million merchant partners worldwide, we connect more than 16 million customers with exceptional deals across various categories. In a landscape often dominated by e-commerce giants, Groupon stands apart as a platform dedicated to empowering local businesses through performance-driven success.We are currently undergoing a significant transformation, driven by a relentless pursuit of results. Despite our thousands of employees across multiple continents, we foster a culture that inspires innovation, embraces risk-taking, and celebrates achievements. Here, your impact can be immediate, thanks to our scale and the velocity of our transformation. We offer the perfect blend of resources and autonomy, allowing you to make a meaningful impact.Join us on this transformative journey as we seek engineering leaders for the Marketing organization, focusing on both organic and paid marketing domains, to drive millions of real-time communications and shape the future of our company.Our mission is to enhance engagement and conversions by delivering the right message to the right users at the right time, all without reliance on paid media.Your development ecosystem includes:Languages: Java, Spring, RubyFrontend: NodeJS, ReactJSDatabases: MySQL, PostgreSQL, Redis, MemcacheInfrastructure: AWS, GCP, Kubernetes, Docker, TerraformMessaging: Kafka, RabbitMQ, ActiveMQMonitoring & Logging: ELK, Wavefront, SplunkDevelopment Tools: GitHub, Jenkins, JIRA, Confluence, Asana

Groupon is a dynamic marketplace that connects customers with exciting experiences and services, empowering local businesses to thrive. Having partnered with over a million merchants worldwide, we facilitate connections for 16 million customers seeking deals across diverse categories. In a world dominated by e-commerce giants, we pride ourselves on being a platform genuinely committed to the success of local businesses through performance-driven strategies.At Groupon, we are on an ambitious journey to transform our operations with a relentless focus on achieving results. Despite our global presence with thousands of employees, we uphold a culture that fosters innovation, encourages risk-taking, and celebrates success. Here, your impact can be immediate, as we operate on a scale that allows for rapid transformation. We embody a "best of both worlds" philosophy—large enough to offer robust resources, yet small enough for individuals to wield significant autonomy and make a meaningful impact.About the RoleJoin our CoreApps Platform team, the backbone of Groupon's engineering efforts responsible for the global commerce engine. Our platform manages every customer interaction and transaction on a worldwide scale. In this high-impact, senior-level Individual Contributor (IC) role, you will focus on ensuring KTLO stability at massive scale while advancing a significant platform modernization initiative through an AI-first approach.You will take ownership of mission-critical services that handle over 100,000 Requests Per Minute (RPM) and drive the transition from legacy Java/Ruby systems to a modern TypeScript/Node.js microservices architecture, utilizing cutting-edge AI coding tools to achieve unmatched speed and quality.

Join Aircall, a unicorn and AI-driven customer communications platform, trusted by over 22,000 companies globally to enhance revenue, resolve issues swiftly, and expand customer-facing teams. We are revolutionizing customer communications by integrating voice, SMS, WhatsApp, and AI into a cohesive workspace.Our drive stems from a straightforward principle: empower teams to work smarter, not harder. Our AI Voice Agent automates routine calls, AI Assist simplifies post-call tasks, and AI Assist Pro offers real-time guidance, enabling individuals to excel in their roles. The outcome? Increased revenue, expedited resolutions, and teams that scale with assurance.Headquartered in Paris with a robust North American base in Seattle, Aircall also has teams in Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We pride ourselves on building a product that delights customers and a rapidly growing business, supported by top-tier investors and propelled by swift AI advancements across various product lines.At Aircall, you will become part of a dynamic company. We are ambitious, product-focused, and execution-oriented, fostering visible impact, rapid decision-making, and authentic growth.Our Work Culture at Aircall: We prioritize customer satisfaction, leverage data, and strive for meaningful outcomes. We cherish ownership, ongoing learning, and thoughtful speed. If you thrive in a collaborative, fast-paced atmosphere where trust and impact are paramount, you'll feel right at home.We are in search of an enthusiastic and dedicated Staff Engineer to join our expanding engineering team and serve as a technical leader across various engineering groups.In this role as a Staff Engineer, you will drive influence across teams and domains, lead the delivery of solutions on cross-functional and strategic projects, and act as a technical leader within the engineering organization. You will uphold quality standards and promote the adoption of best practices in architecture, security, and DevOps.Quality, excellence, and agility are the cornerstones of our delivery processes, and you will help elevate these standards. Proficient in NodeJS and Typescript back-end stacks, tailored to each requirement, you will always ensure optimal hosting solutions.