Senior Software Developer (Python)

Hamburg

Full-time

Permanent employee

About the role

Data is undeniably one of the world's most valuable resources. However, it's futile if it's not in the right place or the right setup. We strive to place data where it's needed most and can be used to its fullest potential. Become a valued member of our small data product team where you will collaborate on a daily basis with the senior data integration team members.
In this role, you will be instrumental in designing, developing, deploying, and maintaining robust backend systems, scalable data pipelines, and secure cloud infrastructure. You will leverage your expertise in Python, Kafka, RESTful APIs, SQL, modern data platforms, cloud services, and security best practices to build high-performance, reliable applications. As a senior member, you will also contribute to architectural decisions, mentor junior developers, and drive technical excellence within the team.

Your responsibilities

The core function of this role will be backend development: designing, developing, testing, deploying, and maintaining high-quality, scalable, and maintainable Python code
You will be in charge for API development: building and maintaining secure, efficient, and well-documented RESTful APIs using frameworks like FastAPI, Flask, etc
As a senior software developer, you will be focused on data streaming: designing, implementing, and managing stream engines. You work with Kafka producers and consumers for real-time data processing and event-driven architectures. Optimizing Kafka configurations and ensuring the reliability and scalability of data streams
You have a strong proven track record in database management: designing database schemas, writing complex and efficient SQL queries, optimizing database performance, and working with relational databases (e.g., PostgreSQL, Snowflake)
This role involved a strong focus on cloud engineering with a focus on Azure but also including AWS and GCP: designing, deploying, managing, monitoring, and optimizing applications and infrastructure on Microsoft Azure. Utilize Azure services such as Azure Functions, App Service, Azure Kubernetes Service (AKS), Event Hubs, Azure SQL Database, Azure Monitor, etc. Implementing infrastructure as Code (IaC) using tools like Terraform
You will be in charge of security: implementing and championing security best practices throughout the software development lifecycle, identifying and mitigating security vulnerabilities in code and infrastructure, managing authentication, authorization, and data protection mechanisms
Key duties will include tasks related to architecture & design: contributing to system architecture discussions, technical design decisions, and technology selection
You will support in mentorship & collaboration: mentoring junior engineers, conducting code reviews, sharing knowledge, and collaborating effectively with cross-functional teams (Product, DevOps, QA, Data Science)
You have interest in troubleshooting & optimization: diagnosing and resolving complex technical issues, optimizing application performance, and ensuring system reliability and uptime

Our requirements

3+ years of professional software development experience, with a strong focus on backend development using Python
Proficiency API expertise: proven experience designing, building, and consuming RESTful APIs, with specific hands-on experience
Strong Kafka expertise: solid experience working with Apache Kafka, including understanding its core concepts (topics, partitions, brokers, producers, consumers, KRaft), developing Kafka clients, and managing data streams
Knowledge of SQL & Databases: strong proficiency in SQL and experience with relational database design, querying, and optimization (e.g., PostgreSQL, Snowflake, Azure Synapse)
Expertise of cloud platform engineering: demonstrable hands-on experience deploying and managing applications and services on Microsoft Azure (or AWS / GCP). Familiarity with core Azure services (Compute, Storage, Networking, Databases, Monitoring)
Knowledge of security fundamentals: solid understanding of application security principles, zero trust, authentication/authorization protocols and secure coding practices
You are familiar with SDLC tools: proficient with version control systems (Git), CI/CD pipelines (e.g., Azure DevOps, Gitlab, GitHub Actions), and testing frameworks (e.g., pytest)
Led cross-functional teams to execute end-to-end software development projects, from planning through deployment
Problem-solving attitude
Strong logical and mathematical thinking capabilities
Independent working style
A university degree in computer science, information technology, or related discipline
Articulate with impeccable verbal and written communication skills in English and German. Strong & discerning listener.

What we offer

Space to grow: Taking ownership in international projects while continuously expanding your skills
Mentorship and Onboarding: Structured introduction supported by a dedicated mentor
Cutting-edge workspace: Work with the latest technology and modern equipment to drive innovative solutions
Long-term stability: Permanent employment in a family-oriented and people-focused company
Diverse & inclusive environment: Join a truly international environment and collaborate daily with teammates from over 15 different nationalities
Balance matters or work-life harmony: A work schedule designed to promote well-being and productivity
Team culture & connection: Social events and structured team-building days held in Berlin and Hamburg
Language courses: Learn, improve or practice your conversational skills on language platform Lingoda
Never stop learning: You’ll receive a dedicated budget to industry-leading platforms like Udemy and MasterClass to sharpen your technical expertise and leadership skills
…and many other Job perks (childcare subsidy, company pension scheme, job bike, etc…)

About us

We love data.

Envisioning advanced data architectures and bringing them to live is our passion.

reeeliance is a consultancy specializing in Data Management, Fast Data, Advanced Analytics, and DataOps and AI Readiness. We further support our clients in modernizing their SAP landscape and moving their business to the cloud. Our IT consulting company is powered by a team of around 50+ IT consultants, engineers, who love what we do and work together to make an impact.

Based in Hamburg, Berlin, and Porto, we combine strategic foresight with sound data and software engineering craftsmanship to define, build, and operate scalable information ecosystems for our international clients, helping them transform into real data-driven enterprises.