Senior Backend Software Engineer - Scalability and Performance
DatadogMadrid, Spain; Paris, France; Tel Aviv, Israel
Hybrid Full-time
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Experience Level
Senior
Qualifications
You possess over 5 years of experience in building backend software for production, utilizing languages such as Go, Python, Java, C++, or Rust. You have contributed to the design and development of backend services or APIs and enjoy tackling real-world engineering challenges. You have some knowledge of distributed systems (e.g., fault tolerance, messaging, scalability) and are eager to deepen your expertise. You produce clean, maintainable code and approach system design with a thoughtful mindset.
About the job
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.
About Datadog
Datadog is a leading monitoring and security platform for developers, IT operations teams, and business users. By providing observability and security solutions, Datadog empowers teams to improve application performance and infrastructure reliability.
As a Senior Backend Software Engineer at Blacklane, you will join one of our autonomous agile teams. Your contributions will enhance the services that drive our innovative platform, improve our back-office systems, and address integration challenges that enable our business partners to seamlessly connect with Blacklane.Our tech stack comprises Ruby, Go, Type…
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.
Join us at Fever, the premier tech platform dedicated to enhancing cultural and live entertainment experiences globally.Our mission is to democratize access to culture and entertainment. Utilizing our advanced technology and data-driven strategies, we are changing how audiences engage with live events. Every month, over 300 million individuals across more than 40 countries discover unforgettable experiences on our platform, while we empower event creators to innovate and grow their reach.We proudly collaborate with industry giants such as Netflix, F.C. Barcelona, and Primavera Sound, delivering internationally acclaimed experiences and backed by leading global investors. Impressive, isn’t it?To further our mission, we seek exceptional talent with a proactive mindset, eager to contribute to the future of entertainment. Are you ready to be part of this journey?The engineering team is the backbone of our user-friendly iOS and Android applications and website, responsible for developing, enhancing, and maintaining all Fever services, ensuring that users have outstanding experiences.About the RolePosition: Senior Software Engineer (Backend Platform)Location: SpainWe are looking for a highly skilled software developer with a proven track record of delivering exceptional results. A person who values code quality and emphasizes doing things correctly, not just completing tasks.Collaborate within an agile, cross-functional team alongside other talented software engineers and product designers.Develop production-quality code and implement solutions capable of handling significant traffic.Mentor team members through code reviews, architecture design sessions, and pair programming.Receive mentorship from colleagues in areas where you seek to grow.During your onboarding period, you will:Engage in a structured program designed to facilitate a smooth transition into your role.
Location: Madrid Office About Aircall Aircall builds an AI-driven customer communications platform used by over 22,000 businesses worldwide. Our product brings together voice, SMS, WhatsApp, and AI features in a single workspace, helping teams boost revenue, resolve issues faster, and scale their operations efficiently. Headquartered in Paris, Aircall has a strong global footprint with offices in Seattle, Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our company is growing quickly, supported by leading investors and advances in AI across our product lines. Our Culture We focus on customer satisfaction, data-driven decisions, and meaningful results. Team members are encouraged to take ownership, keep learning, and act quickly but thoughtfully. Collaboration, trust, and impact shape our daily work. About the New Product Unit Aircall is launching a New Product Unit dedicated to advancing autonomous sales. The team is building an AI Orchestration Layer that records and understands customer interactions across calls, video, email, and WhatsApp. This system will automate sales workflows such as CRM updates, follow-ups, task creation, and coaching insights. Our long-term vision is a self-optimizing Sales OS powered by specialized AI agents working together to improve revenue processes. Role Overview: Senior Backend Software Engineer (Python) This position calls for an experienced backend engineer with strong Python skills, ready to work beyond traditional backend boundaries. The role suits someone who values both clean architecture and practical progress, and who can balance high-quality work with the need for speed in a startup setting. What You Will Do Tackle complex technical challenges, including distributed systems, AI orchestration, architecture, performance, and scalability Contribute to the design and implementation of backend systems for the AI Orchestration Layer Work closely with product and engineering teams to deliver new features Iterate quickly, shipping solutions and learning from feedback Who Will Thrive Engineers who enjoy solving difficult problems and making architectural decisions Those who can dive deep into technical details while keeping an eye on rapid delivery People who take pride in their work and appreciate the pace of a growing company
Join Exoticca as a Senior Backend Software Engineer!About UsExoticca is a trailblazing online travel agency dedicated to transforming the way people experience long-distance travel. Our mission revolves around crafting memorable life experiences through exceptional travel adventures. We pride ourselves on offering unmatched value, exploring diverse destinations, and creating extraordinary travel journeys while prioritizing our customers and the environment.Our vibrant, multicultural team is expanding rapidly, and we are on the lookout for passionate individuals who can contribute to building a pioneering travel company that redefines the industry.Your RoleWe are seeking a Senior Backend Software Engineer who excels at problem-solving. You will leverage engineering as a powerful tool to address real-world customer and business challenges.This position falls within our Trip Management System domain, where you will empower our travel specialists to design remarkable journeys at scale. You will contribute to the systems that convert destinations, itineraries, flights, hotels, and pricing strategies into structured, market-ready travel products. Through seamless product configuration, accuracy, and scalability, your work will directly enhance revenue, operational excellence, and customer satisfaction.While technology choices are important, the impact of your work is paramount. You will engage with PHP, Node.js, and contemporary AI tools, selecting the optimal approach for each unique challenge without being limited to a single technology stack.Why Join Us?Engage with genuine, impactful challenges that enhance customer experiences.Enjoy the freedom to select the right tools, including advanced AI technologies.Work within a team that values initiative, ownership, and meaningful contributions over titles and bureaucracy.Face scale-up challenges with opportunities to influence architecture, products, and workflows.If you seek stimulating problems, autonomy, and opportunities for professional growth, we welcome you!
The Role Join our expanding Player Rewards & Gamification Product Development team in Malaga as a Backend Software Engineer! At Betsson Group, we prioritize customer engagement to ensure our players return for more. Our focus is on building loyalty through an exceptional customer experience beyond mere gameplay, featuring tournaments, dynamic personalized campaigns, and much more! As part of our journey towards containerization, you'll play a crucial role in enhancing the scalability of our systems while maintaining their high quality. We constantly reevaluate our system designs to meet new requirements and work on exciting features. Your Responsibilities: Design and develop distributed backend services utilizing .NET and an event-driven architecture. Collaborate with product and commercial teams to transform engagement ideas into scalable, maintainable, and user-friendly solutions. Optimize our microservice ecosystem for improved performance, reliability, and observability. Advance our containerization and cloud migration strategies. Engage in architecture discussions and contribute to shaping technical decisions. For senior engineers: Lead architectural decisions and proactively identify areas for improvement. Write maintainable, well-tested code and conduct code reviews. Participate in incident resolution and the team’s on-call rotation. Maintain clear technical documentation including ADRs, runbooks, and guidelines. Develop and share your domain expertise within the team.
Join Our TeamAt Quadrivia, we are revolutionizing healthcare technology with Qu, a fully controllable and customizable AI assistant crafted by clinicians for clinicians. We tackle the pressing shortage of healthcare professionals by providing timely, personal, and dependable support for a variety of clinical tasks throughout the care continuum. Qu is tailored for healthcare providers, payers, and pharmaceutical companies, ensuring easy customization and seamless integration into existing workflows for optimal assistance across the care spectrum.Your ImpactAs a Senior Backend Software Engineer, you will architect and develop the robust backend systems that power the Quadrivia clinical AI platform. This includes building high-availability services, creating event-driven architectures, developing data pipelines, and establishing orchestration layers for our clinical AI agents.This position is highly technical and hands-on, playing a critical role in ensuring our systems' reliability, safety, and performance.
Full-time|Hybrid|Madrid, Spain; Paris, France; Tel Aviv, Israel
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.
Join our dynamic team at bunch as a Senior Backend Engineer, where you will lead the design and development of innovative backend systems. You will collaborate closely with cross-functional teams to deliver high-quality software solutions that enhance user experiences. Your expertise will drive the architecture of scalable applications, ensuring they are robust and efficient.
Are you a skilled Backend .NET/C# Engineer seeking an exciting new opportunity? Join the Gaming Area within Product Development at Betsson Group! Our Gaming Area focuses on enhancing Game Play and Game Discovery across all our brands and markets. We are dedicated to delivering the industry's finest gaming products while providing an engaging user experience on our platforms. Our scope includes game lobbies, gaming initiatives, provider integrations, and much more. Your Role You will play a vital role in our core Gaming platform, which supports all our gaming sites and is pivotal to our company strategy. As we embark on our journey towards containerization, you will contribute to scaling our systems while preserving their high quality. We continuously reassess our system design to meet new requirements and work on exciting features. You will collaborate with a passionate team to build a scalable, multi-brand platform supporting over 25 online brands, utilized by hundreds of thousands of users globally. In summary, you will elevate our Gaming platform which serves a worldwide audience! Key Qualifications We are looking for candidates with prior experience as a backend developer and familiarity with the following core technical skills. You should be a collaborative individual who enjoys helping and sharing knowledge with team members. C#, .NET Framework, .NET Core 8 .NET Core Web API SQL Server and NoSQL databases Messaging services within a microservice architecture GitHub and GitFlow Workflow branching strategy Experience in an Agile environment Proficiency in written and spoken English Additionally, experience with RabbitMQ/Kafka, Docker containerization, and Domain Driven Design is a plus. Our Technology Stack At Betsson, we pride ourselves on staying adaptable and current with the latest technologies. Our current tech stack includes: Backend: .NET C#, .NET Core, Specflow .NET Core Web API, .NET Web API AWS, Kubernetes, Docker PostgreSQL, MSSQL, Redis, Couchbase Apache Kafka, RabbitMQ GitHub, TeamCity What We Offer Health Insurance 401k Paid Time Off
We are seeking a talented and experienced Staff Software Engineer (Backend) to join our dynamic team in the fast-paced world of quick commerce. As a vital member of our engineering team, you will be responsible for designing, developing, and maintaining backend services that power our innovative delivery solutions.Your expertise will contribute to enhancing our platform's performance, scalability, and reliability, ensuring we deliver exceptional service to our customers.
Join Affirm as a Backend Software Engineering Manager, where you'll lead our team in developing innovative repayment solutions for international markets. In this remote role, you will be responsible for overseeing the design, implementation, and optimization of backend systems that enhance user experiences and drive business success. Collaborate with cross-functional teams to ensure robust and scalable product delivery.
At Affirm, we are redefining credit to be more transparent and user-friendly, enabling consumers to enjoy the flexibility of buying now and paying later without hidden fees or accruing interest.The Comms Platform team plays a pivotal role in sustaining our organization's success by managing essential services that facilitate transactional communications to our customers through email, SMS, and push notifications. These services require meticulous attention to detail, proactive maintenance, and quick response times to ensure uninterrupted operations.Our current high-priority projects include re-architecting and modernizing our platform, enhancing high availability, and expanding internationalization efforts. These initiatives are crucial for our growth and competitiveness in the market. They demand dedicated expertise and resources to be executed effectively. Without sufficient capacity, we risk delays, reduced quality, and missed opportunities to achieve our strategic objectives. Most importantly, we aim to provide our customers with timely and high-quality communications!Your Responsibilities· Own and drive quarterly goals for your team, leading engineers through uncertainties to resolve complex challenges while ensuring team support throughout the delivery process.· Collaborate with peers and stakeholders in the product development lifecycle, working closely with product management, design, and analytics during ideation, articulating technical constraints, and making decisions that carefully weigh risks and trade-offs.· Proactively identify and advocate for solutions to project, process, technology, or business issues.· Ensure the operation and availability of your team’s artifacts by establishing and monitoring metrics, escalating when necessary, and supporting on-call duties.· Cultivate a culture of quality and ownership within your team by setting or enhancing code review and design standards, advocating for them beyond your team through your writing and technical talks.· Mentor and develop talent within your team by providing constructive feedback and guidance, leading by example.· Participate in an on-call rotation as part of your responsibilities.
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.
Are you an accomplished Backend .NET/C# Engineer ready to take the next step in your career? The Gaming Division within Product Development at Betsson Group is currently seeking talented professionals! The Gaming Division focuses on enhancing Game Play and Game Discovery across our diverse brands and markets. Our mission is to provide industry-leading gaming products and an exhilarating user experience on our platforms. We are involved in developing game lobbies, innovative gaming initiatives, and seamless provider integrations. Your Role As a vital member of our team, you will contribute to the development of our Gaming platform, which is at the heart of our operations. This platform underpins all our gaming sites and plays a crucial role in our broader company strategy. You will engage in our transition towards containerization, enhancing the scalability of our systems while ensuring their quality remains top-notch. We continuously reassess our system designs to meet new demands and work on exciting new features. Join our passionate team as we build a scalable, multi-brand platform that supports over 25 online brands, utilized by hundreds of thousands of users worldwide! In essence, you will elevate our Gaming platform to new heights for a global audience!
Join Affirm as a Staff Software Engineer specializing in backend deal reporting. In this role, you will contribute to critical systems that facilitate our reporting processes, ensuring accuracy and efficiency. You will collaborate with cross-functional teams to design and implement robust solutions that meet business needs.
About the Role resilientco is looking for a Senior PHP Backend Engineer based in Spain. This role focuses on building and maintaining backend systems that support core applications. The work centers on PHP and requires experience designing reliable solutions for modern software products.
Full-time|On-site|Barcelona, Catalunya [Cataluña], Spain
Join our dynamic global team as a Junior Backend Engineer where you will play a crucial role in ensuring the quality, development, and implementation of our software solutions.As part of our technology department, you will collaborate with a diverse group of accomplished professionals located around the world, including teams in Barcelona, New York, London, Manchester, Bucharest, and India. If you’re passionate about technology and keen to make a significant impact within a rapidly growing company, we would love to hear from you!Your Role in TransPerfect – TechOps:The TransPerfect TechOps team has been integral to our success over the past decade, providing innovative technology and services that greatly enhance the experiences of our clients and colleagues. From streamlining workflows for our staff to developing essential services that underpin our GlobalLink platform, our work enables users to navigate complex ecosystems effortlessly.
airapps is hiring a Backend Engineer in Barcelona to help build and improve its applications. This position centers on developing backend systems that support new features and maintain reliability. What you will do Work closely with team members to design and implement backend solutions Contribute to the ongoing development and stability of airapps products Address technical challenges as they arise Who we’re looking for Experience building and maintaining backend systems Comfort working collaboratively in a team setting Motivated to solve problems and support product innovation This role is based in Barcelona and offers the chance to work alongside a group of dedicated engineers focused on building quality applications.
Grafana Labs is a pioneering, remote-first company known for its open-source innovation. With over 20 million users worldwide utilizing Grafana, our acclaimed visualization tool tracks everything from environmental changes to vital medical devices. Our dashboards are iconic, having been featured at events ranging from NASA launches to the Tour de France. We empower over 3,000 organizations, including industry giants like Bloomberg, JPMorgan Chase, and eBay, to navigate their observability strategies through our Grafana LGTM Stack, which can be fully managed with Grafana Cloud or self-managed with the Grafana Enterprise Stack, both offering scalable metrics (Grafana Mimir), logs (Grafana Loki), and traces (Grafana Tempo).As we experience rapid growth, we remain committed to our core values: a robust open-source foundation, a collaborative global culture, and a dedication to impactful work. Our team excels in an environment driven by innovation, where transparency, autonomy, and trust are paramount.If you find this role intriguing, don't hesitate to apply, even if you don't meet every single requirement. This could be a pivotal moment in your career.Senior Backend Engineer - AlertingThis is a remote opportunity, and we welcome applications from Spain.The Opportunity:The Grafana Alerting team plays a vital role in the Grafana open-source project (link), dedicated to delivering comprehensive alert management solutions. Our backend team collaborates closely with clients and Grafana Cloud teams to ensure alerting operates seamlessly, whether on-premises or in the cloud.Our work encompasses a wide array of projects, including:Developing distributed systems to enhance the ingestion and delivery of Prometheus-based alerts.Standardizing alert setup and delivery for both Grafana and Prometheus-based alerts.Building distributed systems to efficiently evaluate Grafana-managed alerts, achieving over 500 evaluations per second in production.Grafana Alerting is trusted by leading organizations worldwide, safeguarding crucial medical apparatus and critical infrastructure. We thrive...
