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# Backend Software Engineer

- **Company:** Mambu GmbH
- **Location:** Paris, France (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), 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:** July 10, 2026
- **Apply:** https://careers-mambu.icims.com/jobs/3450/senior-software-engineer/job?mode=apply&apply=yes&in_iframe=1&hashed=-1834412606

## 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

## Description

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.


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