Senior Software Engineer

Job Locations ES-Barcelona

Posted Date 1 month ago(10/07/2026 11:52)

Job ID 2026-3449

of Openings

1

Position Class Employee

Position Type Full time

Org Level 2 CPTO Office

Who we are

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.

What you’ll do

We are hiring Senior Backend Software Engineers across 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 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.

What you’ll bring

• 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

What you’ll get

Join us to shape the future of banking, where your professional growth is equally as valued as your personal well-being.

• Competitive base salary
• Company equity for all
• Learning and development opportunities
• Hybrid/Remote working (location dependant)
• 60 day working abroad
• 4 week paid sabbatical after 5 years service
• Additional benefits based on location

Let's connect!

Follow Mambu on LinkedIn for the latest Fintech trends and success stories. Connect with us on Facebook, Instagram, and YouTube to experience our vibrant culture. Explore our mission, values, and the world we're building at . Check out our Insights Hub for industry insights, Mambu blogs, webinars, and upcoming events.

As part of the recruitment (or HR onboarding) process, you will be required to obtain authorized criminal background and credit screening results, as well as be queried against a sanctions/anti-money-laundering/counter terrorism financing/politically exposed persons screening service and your employment is conditional upon approval of these results.

At Mambu, we encourage all interested candidates to apply, even if they don't meet every listed qualification, as we value diversity and recognize that experience doesn't always perfectly align with job descriptions. We are committed to providing equal opportunities for applicants with disabilities; if you need assistance during the application process, please contact [email protected].

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