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 .

Las cualificaciones, habilidades y toda la experiencia relevante necesaria para este puesto se pueden encontrar en la descripción completa a continuación.

We are hiring Senior Backend Software Engineers across all teams. As a Senior Backend Software Engineer, you will be responsible for:

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- Developing bank connectivity and payment automation products, features, and capabilities, with a focus on security, stability, and performance

- Owning architectural decisions for complex, high-impact projects and driving technical direction across teams

- Collaborating with Product Managers and DevOps Software Engineers to maintain a fast-paced, iterative, and continuously improved product development and delivery process

- Applying security by design principles to public and internal APIs

- Solving architectural and technical challenges to reduce complexity while creating value for customers and users

- Mentoring and upskilling junior and mid-level engineers through code reviews, pair programming, and technical guidance





- Defining and executing Numeral's technical roadmap to improve team velocity and control technical debt

- Acting 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 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 xhfqzwm 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

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- 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

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📌 Senior Software Engineer (Barcelona)
🏢 Mambu Payments (formerly Numeral)
📍 Barcelona