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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - **Company:** Mambu Payments (formerly Numeral) - **Location:** Madrid, Spain - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Amazon Elastic Compute Cloud, Amazon S3, Software as a Service, Cloud Computing, Code Review, Relational Databases, DevOps, Message Broker, Pair Programming, Software Engineering, Management of Software Versions, Technical Debt, Backend, Gitlab, Kubernetes, Apache Kafka, Api Design, Golang - **Published:** August 5, 2026 - **Apply:** https://www.buscojobs.com.es/senior-software-engineer-en-madrid-ID-365546536 ## About the Role 5+ years of professional software engineering experience, with significant hands?on experience in Golang Background in fintech, banking, or payments (SEPA, Swift, Ebics...), with an understanding of the regulatory and operational constraints of the industry Proven track record designing and owning complex, distributed backend systems in production Deep experience with relational databases and SQL, including high-concurrency environments, transaction management, and isolation levels at scale Strong understanding of the challenges of running a high-volume SaaS platform at scale, with a track record of producing quality, maintainable, well-documented code that respects best practices Advanced API design skills, with a strong focus on security, versioning, and documentation Demonstrated ability to mentor engineers and elevate team-wide engineering standards You are curious, interested in business understanding and product oriented You are highly autonomous, proactive, and comfortable driving ambiguous technical problems to resolution Nice-to-have skills DevOps appetite - you have been in involved in implementing / using CI using Gitlab and Kubernetes Cloud hosting with AWS and experience with EC2, S3, EKS, RDS... Familiar with Kafka or similar message broker middlewares #J-*****-Ljbffr ## Description Join the fintech revolution with Mambu, the leading SaaS cloud banking platform.We're on a mission to make banking better for a billion people.We're engineering the future of financial services with AI at its core.At Mambu, AI isn't a feature - it's how we're rebuilding banking from the ground up.If you're ready to apply cutting-edge technology to problems that affect millions of people, your next chapter starts here.Learn more here .We are hiringSenior Backend Software Engineersacross all teams.As a Senior Backend Software Engineer, you will be responsible for:Developing bank connectivity and payment automation products, features, and capabilities, with a focus on security, stability, and performanceOwning architectural decisions for complex, high-impact projects and driving technical direction across teamsCollaborating with Product Managers and DevOps Software Engineers to maintain a fast-paced, iterative, and continuously improved product development and delivery processApplying security by design principles to public and internal APIsSolving architectural and technical challenges to reduce complexity while creating value for customers and usersMentoring and upskilling junior and mid-level engineers through code reviews, pair programming, and technical guidanceDefining and executing Numeral's technical roadmap to improve team velocity and control technical debtActing as a technical reference and escalation point for critical incidents and high-stakes production issues.5+ years of professional software engineering experience, with significant hands?on experience in GolangBackground in fintech, banking, or payments (SEPA, Swift, Ebics...), with an understanding of the regulatory and operational constraints of the industryProven track record designing and owning complex, distributed backend systems in productionDeep experience with relational databases and SQL, including high-concurrency environments, transaction management, and isolation levels at scaleStrong understanding of the challenges of running a high-volume SaaS platform at scale, with a track record of producing quality, maintainable, well-documented code that respects best practicesAdvanced API design skills, with a strong focus on security, versioning, and documentationDemonstrated ability to mentor engineers and elevate team-wide engineering standardsYou are curious, interested in business understanding and product orientedYou are highly autonomous, proactive, and comfortable driving ambiguous technical problems to resolutionNice-to-have skillsDevOps appetite - you have been in involved in implementing / using CI using Gitlab and KubernetesCloud hosting with AWS and experience with EC2, S3, EKS, RDS...Familiar with Kafka or similar message broker middlewares#J-*****-Ljbffr ## Related Videos - [WeAreDevelopers LIVE - Modern DevOps for IoT Devices and More](https://www.wearedevelopers.com/videos/1805-wearedevelopers-live-modern-devops-for-iot-devices-and-more) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [From DevOps to Scaled DevOps: How We’re Rebuilding Continuous Delivery as a Platform](https://www.wearedevelopers.com/videos/100018-from-devops-to-scaled-devops-how-we-re-rebuilding-continuous-delivery-as-a-platform) - [Go with the Flow: Stop the Leaks Before Your Memory's a Waterfall!](https://www.wearedevelopers.com/videos/100073-go-with-the-flow-stop-the-leaks-before-your-memory-s-a-waterfall) - [#90DaysOfDevOps - The DevOps Learning Journey](https://www.wearedevelopers.com/videos/548-90daysofdevops-the-devops-learning-journey) - [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner) ## Related Articles - [Highest Paying Tech Companies in Europe](https://www.wearedevelopers.com/magazine/162-highest-paying-tech-companies-in-europe) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [7 Most Popular Web Developer Jobs in Europe](https://www.wearedevelopers.com/magazine/163-7-most-popular-web-developer-jobs-in-europe) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [How Much Does a Software Engineer Make? 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