Software Engineer (Python) at Lynxtech | Madrid

Note: Only candidates located in Spain will be considered. Visa sponsorship is not available. Lynx Financial Crime Tech S.A develops AI-driven systems to detect and predict behavioral patterns in financial transactions. The team draws on backgrounds in both finance and academia, focusing on self-learning tools that support low-latency processing for clients in banking, fintech, and commercial sectors. Their solutions work across on-premises and cloud environments. The company values vision, agility, and speed, aiming to build trust with customers and encourage proactive risk management. Lynx supports diversity and equal opportunity, welcoming people from all backgrounds. Role overview This Madrid-based Software Engineer (Python) position centers on building and maintaining an AI-powered anti-money laundering (AML) tool. The platform relies on Big Data and real-time processing to deliver self-learning solutions for the financial sector. Main responsibilities Analyze requirements and contribute to solution design. Develop and maintain a cloud application for AML detection in financial environments. Assess system performance and identify areas for speed improvements. Conduct quality assurance testing to validate new features and changes. Create and manage test cases. Diagnose and resolve software issues. Promote best practices in the use of development repositories and tools.

Join Altersolutions as a Python Developer and be part of a dynamic team in Madrid! We are looking for passionate and talented individuals to contribute to exciting projects and drive innovation.

Join our dynamic team at Sopra Steria as a Python Developer in a hybrid work environment in Madrid. We are searching for a passionate individual who is ready to take on challenging projects and contribute to innovative solutions. Your expertise in Python will play a crucial role in developing and maintaining high-quality software that meets our clients’ needs.

Lynx Financial Crime Tech is seeking a talented Elasticsearch Specialist Engineer.WHY YOU SHOULD CONSIDER THIS OPPORTUNITYAt Lynx Financial Crime Tech S.A., we are an AI-driven software company specializing in detecting and predicting behavioral patterns in financial transactions. Led by a team of experts from both the finance and academic sectors, we develop and deploy cutting-edge self-learning AI technologies. Our platform excels in low-latency transaction processing technologies, available both on-site and in the cloud.We prioritize VISION, AGILITY, and SPEED to deliver exceptional customer experiences, forging lasting and trustworthy relationships with leading financial institutions, fintechs, and commercial enterprises worldwide.We embrace a strong risk culture and expect every team member, regardless of position, to maintain a proactive and responsible approach to risk management.Lynx is proud to be an equal opportunity organization, regardless of gender identity, culture, or disability. Our mission is to empower more individuals and businesses to thrive. YOUR ROLEAs an Elasticsearch Specialist Engineer, your role will be pivotal in the architecture, maintenance, and optimization of our Elasticsearch clusters, which are essential for the real-time search, correlation, and analysis of financial transaction data.You will participate in:Designing and implementing efficient architectures using Elasticsearch.Performance analysis and tuning of queries, shards, indices, and nodes.Integrating Elasticsearch with other components of our AWS platform.Diagnosing and resolving issues related to searches and storage.Continuous improvement of system monitoring, scalability, and resilience.Collaborating with data engineers and backend developers. EXPERIENCE4+ years of experience working with Elasticsearch in production environments.Strong knowledge of performance tuning and optimization.

Join aircall, a leading unicorn in the customer communications space, revolutionizing how businesses engage with their customers through an AI-powered platform. With over 22,000 global clients, we merge voice, SMS, WhatsApp, and AI into a unified workspace that enhances team efficiency and customer satisfaction.Our mission is simple: empower teams to achieve more by working smarter. Our innovative AI Voice Agent automates routine calls, while AI Assist streamlines post-call tasks, and AI Assist Pro provides real-time insights to optimize performance. This results in increased revenue, quicker issue resolution, and scalable teams.Headquartered in Paris, with a robust presence in North America through our Seattle office, we also have teams in Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our product is beloved by customers, and our rapid growth is supported by top-tier investors and cutting-edge AI advancements across our offerings.Our Work Culture: At aircall, we prioritize customer focus, data-driven decision-making, and significant outcomes. We cherish ownership, continuous learning, and a sense of urgency. If you thrive in a collaborative and fast-paced environment where trust and impact are valued, you will fit right in.As a Software Engineer, you will play a pivotal role in designing, developing, deploying, and maintaining critical business features that enhance customer value. Your day-to-day will involve ensuring operational excellence, utilizing metrics, and adhering to best practices.Driven by quality, excellence, and agility, you will help elevate our delivery processes. Leveraging NodeJS and Typescript within our AWS-hosted environment, you will create resilient services that seamlessly integrate with essential customer tools such as CRM, Helpdesk, and E-Commerce platforms.

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.

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.

Join our dynamic global team as a Software Engineer, where you will play a crucial role in ensuring the quality, development, and implementation of our innovative software products. As part of a diverse technology department, you will collaborate with talented professionals from cities like Barcelona, New York, London, Manchester, Bucharest, and India. If you're eager to contribute to a growing company and make a significant impact, we would love to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been instrumental in our company's success for over a decade, delivering technology and services that have greatly enhanced the experiences of our clients and colleagues. From improving workflows for team members to developing core services that underpin our GlobalLink platform, we strive to create scalable client interfaces that make complex ecosystems accessible to everyone.

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.

About the Role Neoris is hiring a Python Developer in Madrid. This role focuses on building scalable applications and tools that support business operations and drive efficiency. Collaboration with teams from different functions is a key part of the work. What You Will Do Design, implement, and maintain software solutions using Python Work with colleagues across departments to understand needs and deliver effective tools Contribute to projects that improve processes and operational performance Location This position is based in Madrid, Spain.

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.).

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

Join us as an intern in the Software Systems Engineering department at Bosch Group in Madrid! This is an exciting opportunity for students to gain hands-on experience in software engineering, working alongside industry professionals to develop innovative solutions.

Role Overview Speechify is looking for a Software Engineer focused on iOS Core Product to join the team in Madrid, Spain. This position centers on building and improving iOS applications that reach a broad audience. The work involves shaping the user experience and making sure each release meets a high standard of quality. What You Will Do Develop and refine features for Speechify’s iOS apps Work closely with colleagues from different disciplines to deliver new functionality Contribute to the design and implementation of updates that improve the user experience

Join Aircall, an innovative unicorn transforming customer communications through AI-powered solutions utilized by over 22,000 businesses globally. Our platform unifies voice, SMS, WhatsApp, and AI into a cohesive workspace that enhances efficiency and revenue.With a mission to empower teams to operate smarter, Aircall’s AI Voice Agent automates routine calls while AI Assist and AI Assist Pro provide streamlined processes and real-time assistance, enabling teams to achieve remarkable results.Headquartered in Paris, Aircall has a robust presence in North America with a headquarters in Seattle and teams across cities including Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our rapidly growing business is supported by leading investors and driven by continuous AI innovation across our diverse product lines.Culture at Aircall: We prioritize customer focus, data-driven decision-making, and the delivery of impactful outcomes. Our values include ownership, continuous learning, and a commitment to thoughtful execution. If you thrive in a collaborative and fast-paced environment where trust and impact are prioritized, you will find your place here.We are seeking an enthusiastic and dedicated Senior Software Engineer to contribute to our expanding Communication Platform department as part of the Number Management team. In this role, you will spearhead the design, development, deployment, and maintenance of essential features that significantly enhance customer value.You will actively promote best practices and mentor colleagues within your team and across the engineering department.Our commitment to quality, excellence, and agility is central to our delivery processes, and you will play a vital role in elevating these standards.

About Air Apps Air Apps began as a family-founded company in Lisbon in 2018 and has grown to operate in both Lisbon and San Francisco. The team builds the AI-powered Personal & Entrepreneurial Resource Planner (PRP), aiming to change how people manage resources. Air Apps remains self-funded and has reached over 100 million downloads worldwide. Role Overview: Lead Software Architect The Lead Software Architect will define and oversee the system architecture for Air Apps’ AI-driven platform. This role involves collaborating with engineers, product managers, and stakeholders to design solutions that are scalable, secure, and high-performing. The architect will help guide technology choices, evaluate new tools and frameworks, and set standards for software design, cloud infrastructure, and system integration. Key Responsibilities Shape and manage the overall architecture for Air Apps’ platform Work closely with cross-functional teams to deliver solutions aligned with business goals Assess and recommend new technologies, frameworks, and best practices Ensure security, scalability, and performance across systems Contribute to technology strategy and decision-making Work Location and Relocation This is a fully onsite role based in Madrid Relocation support is available for candidates moving to Madrid Join Air Apps to help shape products that empower people worldwide and contribute to a collaborative, creative culture focused on innovation.

Join our dynamic team at Sigma Software Group as a Senior TypeScript/Node.js Developer. We are seeking an innovative and experienced developer to contribute to our cutting-edge Swedish ad platform. You will work collaboratively with a talented group of professionals, enhancing our technology stack and delivering high-quality software solutions.

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.

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.