Senior Backend Software Engineer

About Speechify Speechify builds tools that turn text into audio, making reading more accessible for millions. With over 50 million users, our products convert everything from PDFs and books to Google Docs and websites into spoken word. Our apps span iOS, Android, Mac, and Chrome, with our Chrome extension earning recognition as Chrome Extension of the Year by Google and a 2025 Design Award for Inclusivity from Apple. Our team of nearly 200 works fully remotely across the globe, drawing on experience from companies like Amazon, Microsoft, and Google, as well as top academic backgrounds. Collaboration is central here, with engineers, AI researchers, and product thinkers working closely together. Role Overview: Senior Software Engineer – Windows/Desktop Applications This Madrid-based role focuses on building and shaping native Windows desktop applications. The position calls for deep knowledge of Windows App SDK, WinUI, C#, XAML, and occasional C++. What You’ll Do Lead the design and development of native Windows desktop apps using Windows App SDK, WinUI, C#, XAML, and C++ as needed. Define and uphold standards for code architecture, performance, memory management, UI responsiveness, and compatibility across Windows versions. Advance accessibility by integrating support for accessibility APIs, ensuring the app remains usable for all, including users with disabilities. Collaborate with product designers, UX researchers, QA, and other stakeholders to plan features and set long-term strategy for the Windows platform. Manage the full lifecycle of features: from concept and design through implementation, testing, release, and ongoing maintenance. Troubleshoot and resolve complex bugs, performance bottlenecks, and architectural issues, recommending effective solutions. Location Madrid, Spain

Ebury empowers ambitious businesses to achieve global expansion, and we apply the same philosophy to our workforce. We promote innovation, collaboration, and problem-solving, creating an environment where every employee feels valued, supported, and empowered to thrive.If you are a team player eager to revolutionize global business operations, reach out to us. We would love to explore how Ebury can enhance your career and help you shape the future.Senior Software EngineerMadrid Office - Hybrid: 4 days in the office, 1 day working from homeThe FinCore Engineering team at Ebury is looking for a talented Software Engineer to play a vital role in our diverse team located across South America and Europe. The successful candidate will be responsible for developing and optimizing our multi-currency accounting system and facilitating foreign currency exchanges. Your contributions will be essential as we strive to elevate our platform and deliver the best FX experience for our clients and operational teams.As a Senior Software Engineer, your technical expertise will be crucial to our ongoing innovation and growth. We prioritize collaboration and commitment, functioning in a distributed model where effective teamwork is essential.

Ebury empowers ambitious businesses to achieve global growth, and we adopt the same philosophy for our team members. We promote innovation, collaboration, and problem-solving, creating an inclusive environment where everyone feels valued, supported, and empowered to thrive.If you are a collaborative individual eager to revolutionize how businesses operate on a global scale, we invite you to connect with us. Let's explore how Ebury can fast-track your career and enable you to shape the future.Senior Software Engineer (Money Flows)Ebury Madrid or Malaga Office - Hybrid: 4 days in the office, 1 day working from homeThe Engineering team at Ebury is searching for a Senior Software Engineer to play a pivotal role within our diverse team across South America and Europe. The successful candidate will be responsible for developing and optimizing our multi-currency account systems, as well as managing incoming funds and outgoing payment processes. Your contributions will be vital as we continually enhance our platform to deliver an unparalleled payment experience for our clients and operational teams.As a Senior Software Engineer, your technical expertise and skill set will be crucial to driving our innovation and growth. We value strong collaboration and commitment, working effectively within a distributed team.

At KingMakers, we are proud to be the leading platform for sports and iGaming entertainment in Africa, where millions of players engage daily across various markets. Since our inception with BetKing in Nigeria in 2018, we have rapidly expanded our footprint, most recently with the acquisition of SuperSportBet in South Africa. Our dynamic Product & Engineering organization boasts hubs across Europe and Africa, and we are committed to scaling our innovative technology platform in real-time.In this pivotal role, you will be at the forefront of our growth trajectory by driving our payments infrastructure. Every market expansion hinges on our payment systems, which handle every deposit, withdrawal, and transaction across all regions we serve. As we grow, you will face increasing complexities involving more markets, payment providers, and regulatory environments, alongside higher transaction volumes.This role is high-impact; your work will directly influence the financial infrastructure that supports our operations across multiple markets. Reliability, accuracy, and performance are paramount, and your engineering contributions will have immediate implications for both our players and the business. You will be an integral part of a collaborative squad, involved in the entire software development lifecycle, from design to production ownership.Key Responsibilities:Design, develop, and maintain payment processing services, integrating with third-party payment providers, PSPs, and financial networks.Manage features from inception to delivery, including technical design, testing, monitoring, and production support.Utilize event-driven architectures (Kafka, Service Bus) to facilitate reliable, asynchronous processing of high-volume financial transactions.Contribute to a microservices architecture built on .NET/C#, with REST APIs, gRPC, and Azure cloud infrastructure.Work closely with product managers, QA engineers, and other teams (Risk, Platform, Player Account) to create seamless user experiences.Participate in code reviews and contribute to the overall quality of engineering within the squad.Assist in diagnosing and resolving production incidents by identifying root causes.Engage in technical discussions to advocate for optimal solutions.

Join Ebury, a leading fintech company revolutionizing the financial services landscape. We are looking for a Senior Software Engineer to be a pivotal part of our innovative team in Madrid. In this role, you will leverage your expertise to develop and enhance our cutting-edge financial solutions, collaborating with cross-functional teams to deliver exceptional products.

Join aircall, a leading AI-driven customer communication platform, as we innovate the way businesses interact with their customers. With over 22,000 companies relying on our services, we integrate voice, SMS, WhatsApp, and AI into a unified workspace designed to enhance efficiency and drive revenue.Our vision is simple yet powerful: empower teams to work smarter, not harder. With tools like our AI Voice Agent for automating routine calls and AI Assist Pro for real-time guidance, we ensure that our teams can achieve peak performance and fast resolutions.Headquartered in Paris, with a strong presence in North America and multiple offices including Madrid, London, and New York City, aircall is backed by top-tier investors and is rapidly evolving through AI innovation across various product lines.At aircall, you will be part of a dynamic and ambitious team focused on impactful results. We prioritize ownership, continuous learning, and agile practices. If you thrive in a collaborative and fast-paced environment, you will flourish here.We are seeking a dedicated and enthusiastic Senior Software Engineer to enhance our engineering department and contribute to our innovative projects.In this role, you will oversee the design, development, deployment, and maintenance of essential features that deliver significant value to our customers. You will champion operational excellence and best practices while mentoring your team and the wider engineering community.Your work will focus on elevating quality, excellence, and agility within our delivery processes. You will work primarily with NodeJS and Typescript, ensuring our solutions are effectively hosted on AWS.

Join our innovative team as a Senior Software Engineer specializing in orchestration and automation at Celonis in Madrid. In this pivotal role, you will be instrumental in designing and developing cutting-edge software solutions that enhance our automation capabilities. Collaborate with cross-functional teams to streamline processes and drive efficiency across our platforms.

At Celonis, we are at the forefront of Process Intelligence technology, recognized globally as a leader among the fastest-growing SaaS companies. Our mission is to harness the power of AI, data, and intelligence to revolutionize business processes, and we're seeking talented individuals like you to help us achieve this vision. Are you ready to make an impact?The Team:Join our dynamic Celonis Support Services team, a vital component of our 3-Level Support model, as a dedicated 2nd Level Technical Support Engineer. Your base will be in Madrid, where you will report directly to the Director of Customer Support.The Role:As a Senior Software Support Engineer, you will be an essential player in diagnosing and resolving intricate technical and product-related challenges across the Celonis Product Suite. You will act as a vital link between our global customers, partners, and our internal Value Engineering & Delivery, Development, and Product Management teams. We are looking for someone who is enthusiastic about becoming a deep technical expert in Celonis infrastructure and software while contributing to a customer-centered SaaS environment.Your Responsibilities:Focus on expert technical analysis, resolution of complex incidents, and driving ongoing improvements in support operations:Deliver 2nd Level technical support for customer inquiries related to Celonis Systems & Products.Act as a Technical Contact for Premier Customers.Take ownership of complex cases by accepting, qualifying, driving, and resolving them in alignment with ITSM processes and KPI standards.Conduct in-depth analysis, diagnosis, and recovery of complex technical issues, frequently collaborating with customers and internal Product and Engineering teams.Engage in Root Cause Analysis (RCA) activities to enhance the team’s support Knowledge Base.Actively contribute to Continual Service Improvement (CSI) initiatives, including Knowledge Centred Service (KCS).Prepare and present Webcasts on selected technical topics for customers and internal support staff.Participate in an on-call schedule to ensure continuous global coverage.

Role Overview SGS is hiring an Application Support Specialist for the Madrid office. This role focuses on keeping software applications running smoothly and supporting users when technical issues arise. What You Will Do Diagnose and troubleshoot software application problems Provide technical support to users and resolve issues efficiently Implement solutions that improve the user experience Work with teams across the company to optimize application performance Contribute to ongoing improvements in service delivery Who We’re Looking For Proactive problem-solver with strong attention to detail Genuine interest in technology and application support Comfortable collaborating with colleagues from different departments

Welcome to Adyen! At Adyen, we revolutionize the financial technology landscape by providing a comprehensive suite of payment, data, and financial solutions. Our esteemed clients include industry giants like Meta, Uber, H&M, and Microsoft, solidifying our position as the go-to financial technology platform. We are driven by ambition and innovation in every aspect of our work. We believe in fostering a dynamic environment where talented individuals can thrive. Our culture encourages ownership, collaboration, and problem-solving amongst diverse teams facing unique technical challenges. Together, we develop ethical and innovative solutions that empower businesses to achieve their goals efficiently. About Our Financial Products: Adyen is expanding its horizons beyond payments, creating a comprehensive range of embedded financial services tailored for platforms, marketplaces, SaaS businesses, on-demand services, and crowdfunding initiatives. Our mission is to facilitate seamless global management of payments and financial services through cutting-edge API integrations and hosted solutions. Our innovative platform enables businesses to: Execute onboarding, verification, and compliance processes across diverse markets. Manage transactions and expedite payouts and bank transfers in preferred currencies. Provide value-added services such as capital lending and the issuance of payment cards and bank accounts. Our team is dedicated to developing the technology that underpins this unified platform, focusing on various critical areas. Your Role: Develop and maintain our high-performance distributed platform. Contribute to architectural design decisions ensuring our platform's scalability. Mentor and coach junior engineers, fostering a culture of feedback and continuous improvement. Collaborate with a diverse and inclusive team. Launch quickly and iterate frequently, impacting businesses and customers from day one. Identify and enhance platform components for greater robustness and scalability. Work across teams and time zones to drive initiatives, review code, and embrace constructive feedback.

At Datadog, we are revolutionizing how engineers monitor, secure, and scale their infrastructure and applications, driving reliability and performance for thousands of businesses. We process trillions of data points daily and address challenges related to scale, speed, and resilience. We are in search of seasoned backend engineers eager to take charge of vital services and enhance their expertise in distributed systems. If you have experience in building APIs, data pipelines, or backend tools, this position offers an opportunity to expand your influence while mastering the design and operation of high-scale, high-availability systems that underpin observability and security solutions utilized by engineers globally. At Datadog, we cherish our office culture—the relationships it fosters, the creativity it encourages, and the teamwork it cultivates. We embrace a hybrid work model, empowering our employees to achieve a work-life balance that suits them best.

Ebury empowers ambitious enterprises to tap into global growth, mirroring our commitment to our team members. We promote innovation, collaboration, and problem-solving, nurturing an environment where everyone feels valued, included, and equipped for success.If you're a collaborative thinker eager to redefine global business operations, reach out to us. We’re excited to explore how Ebury can fast-track your career and allow you to shape the future.Senior Backend Engineer - JavaScript/TypeScriptEbury (Madrid/Málaga) Office - Hybrid: 4 days in the office, 1 day working from home per weekEbury is a rapidly growing FinTech company on a mission to transform international trade. Our Client Operations Automation squad is at the forefront of this transformation, working on the "Internal Engine" of our global delivery organization.We're advancing beyond conventional automation into the realm of Agentic Orchestration. Your role will extend beyond scripting; you'll design high-performance distributed systems and AI-driven processes that facilitate real-time compliance, client lifecycle management (CLM), and sophisticated RFI workflows.Technical Leadership & Team ContextIn this pivotal role, you will serve as the primary technical leader of your squad, collaborating with three mid-level engineers and one Associate Engineer. You will be the lead architect and mentor, establishing engineering standards and guiding the technical roadmap for enhanced operational efficiency at Ebury.Your ImpactArchitect Intelligent Systems: Spearhead the design and implementation of intricate state machines and workflow orchestration utilizing Temporal and Node.js/TypeScript.Production-Grade AI: Implement and enhance Gemini in production to automate non-deterministic operational tasks, converting manual reviews into streamlined, automated processes.Drive Strategic KPIs: Take ownership of technical objectives that lower our Manual Intervention Rate and enhance Average Handling Time (AHT) for global client operations.Engineering Excellence: Set best practices for observability, "exactly-once" execution, and resilience within distributed systems.Mentorship: Contribute to the team's development through RFC reviews, technical workshops, and collaborative coding sessions with mid-level and associate engineers.

About Speechify Speechify helps people access information by listening instead of reading. Users can listen to articles, cloud documents, and books on their phones, making learning more flexible and accessible. As the top-ranked app in its category, Speechify continues to grow quickly and reshape how people consume audio information. Role Overview The Core Experiences Team builds and maintains the services and SDKs that support Speechify’s product across many platforms. As a Senior Software Engineer in Madrid, this role combines product development with infrastructure work. The position suits someone who enjoys designing reliable APIs, creating straightforward systems, and improving user experience through thoughtful engineering decisions. What You Will Do Collaborate with Product Teams to define project scopes, improve processes for faster customer feedback, and balance integration and user experience needs across teams. Deliver solutions through Speechify’s cross-platform SDK. Improve existing features for better performance, including faster load times and smarter parsing, by refining abstractions and algorithms. Build cloud functions, lightweight backend services, and jobs using Kotlin. What We Look For Strong systems thinking and a preference for simple, effective design. Ability to move quickly, generate ideas, and distinguish between immediate deliverables and projects that need more time. Focus and adaptability within a startup setting, knowing when to collaborate and when to work independently. Experience working with designers, marketers, and product managers; able to inspire and negotiate across disciplines. Location: Madrid, Spain

zooplusse is looking for a Senior AI Software Engineer to strengthen its team in Madrid. This position centers on the software development lifecycle (SDLC) for AI-driven products. Role overview This engineer will work closely with colleagues from different disciplines to create and implement AI algorithms. The focus is on building solutions that improve user experiences and contribute to business goals. Key responsibilities Take part in all phases of the SDLC for AI projects, from initial design through deployment. Work with cross-functional teams to define and deliver technical solutions. Develop and refine advanced algorithms for real-world applications. Location This role is based in Madrid.

Join Aircall, a leading unicorn in the customer communications sector, revolutionizing how over 22,000 companies engage with their customers globally. Our innovative AI-powered platform integrates voice, SMS, WhatsApp, and AI into a single, compelling workspace, designed to drive revenue, enhance issue resolution, and empower customer-facing teams.Our success is rooted in a clear vision: enable teams to work smarter, not harder. Our AI Voice Agent automates routine calls, AI Assist simplifies post-call tasks, and AI Assist Pro provides real-time insights, allowing individuals to perform at their peak. This leads to increased revenue, quicker resolutions, and scalable teams that operate with confidence.Headquartered in Paris, with a robust North American base in Seattle, Aircall operates across dynamic cities including Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our product is beloved by customers, and we are rapidly scaling, supported by top-tier investors and continuous AI enhancements across diverse product lines.At Aircall, you will be part of an evolving company that is ambitious, product-oriented, and execution-driven, where your efforts yield visible impact, swift decision-making, and genuine growth.Our Work Culture: We are deeply customer-focused, data-centric, and committed to achieving significant results. We encourage ownership, ongoing learning, and thoughtful pace. If you excel in a cooperative, fast-paced environment where trust and influence are paramount, you will thrive with us.We are seeking a motivated and passionate Senior AI Software Engineer to enhance our expanding engineering division and contribute to our engineering teams.As a Senior AI Software Engineer, your role will involve the design, development, deployment, and management of AI-driven features that provide substantial value to our customers. Your daily responsibilities will encompass maintaining operational excellence, leveraging metrics and observability, sharing best practices, and mentoring team members across the Engineering department.Quality, excellence, and agility are the bedrock of our delivery processes, and you will be a key player in enhancing these standards. Our development is based on NodeJS and Typescript back-end stacks, tailored to meet specific requirements and always hosted on AWS, creating resilient services that integrate seamlessly with our customers' critical business tools (CRM, Helpdesk, E-Commerce, etc.).

Join the Nexthink Engineering department as a Senior Software Engineer, where you will play a pivotal role in developing our innovative Collectors—endpoint agents that gather and analyze crucial OS information from millions of users.These Collectors not only extract valuable insights about operating systems but also facilitate issue remediation, enhancing the overall user device experience. They are a fundamental and intricate component of our product suite, demanding the utmost reliability and performance across platforms such as Windows, macOS, and Linux.• Challenge #1: Develop robust and dependable solutions.• Challenge #2: Implement solutions tailored for multiple platforms, leveraging the unique advantages of each.• Challenge #3: Strive for cross-platform compatibility whenever feasible.Our engineering team thrives on tackling unconventional challenges, distilling them into actionable solutions. They continuously innovate to enhance our products, prototype their ideas, and see them through to production, all while adhering to our stringent standards of quality, performance, and security.

Join Aircall as a Senior Software Engineer specializing in Applied AI for Corporate Systems. In this pivotal role, you will leverage cutting-edge AI technologies to enhance our corporate systems, driving innovation and efficiency across the organization. You will collaborate with cross-functional teams to design, develop, and implement robust software solutions that meet the dynamic needs of our business.

Role Overview Delta Electronics is looking for a Field Application Engineer - Data Center Solutions to join the team in Madrid. This role focuses on pre-sales technical support and commissioning for our data center offerings. The position works at the intersection of customer needs and technical delivery, helping shape solutions that fit each client. What You Will Do Work closely with sales teams to provide technical expertise and guidance during the pre-sales phase Support customer engagement by addressing technical questions and clarifying solution details Oversee commissioning activities to ensure successful deployment of data center solutions Help tailor solutions to meet the specific requirements of each client Apply a proactive, problem-solving mindset to address challenges as they arise What We Value Collaboration between technical and sales teams Innovative thinking and adaptability A customer-focused approach to technical challenges

Are you ready to take your software engineering career to the next level? Join dLocal as a Senior Software Engineer and become part of an innovative team that empowers global brands to seamlessly collect payments in over 40 emerging markets. In this talent pool, you can express your interest in future opportunities within our IT Team. We are looking for passionate engineers who thrive in a dynamic environment and are eager to tackle challenges head-on. As a valued member of our team, you will contribute to projects that impact millions of lives while collaborating with over 1000 diverse professionals from more than 30 nationalities.