Senior Software Engineer Fullstack

Sennheiser Group; Poznań; Hybrid; PLN 180,000 - 300,000; Full time

Job summary

Sennheiser is seeking an experienced Senior Full-Stack Developer to join our global audio-technology team. You will own frontend architectures, build responsive interfaces, and design cloud-native backend services on Azure to support real-time audio processing and scalable delivery.

You will mentor junior engineers, lead technical reviews, and collaborate with product, design, and audio teams to ship high-quality features.

Qualifications

• 5–8 years of experience in fullstack development with cloud-native apps.
• Strong knowledge of Flutter/Dart for cross-platform mobile apps.
• Proficiency in backend languages: C#, Python, Node.js, or Go.
• Experience designing RESTful APIs and GraphQL services.
• Hands-on with Azure Cloud Services: Functions, App Services, Cosmos DB, AKS.
• Familiar with SQL/NoSQL databases like Azure SQL, Cosmos DB.
• Strong CI/CD and Azure DevOps practices; cloud security basics (OAuth2, JWT, Azure Key Vault).
• Proven mentoring or leadership of engineers; excellent communication.

Responsibilities

• Lead frontend development architecture for web/mobile interfaces.
• Build and maintain cloud-native backend services on Azure.
• Design scalable audio data storage and ensure performance.
• Mentor junior and mid-level developers and coordinate with cross-functional teams.
• Define and enforce CI/CD pipelines and testing strategies; uphold security best practices.

Skills

Frontend ownership

Flutter/Dart

C#

Python

Node.js

Go

RESTful APIs

GraphQL

Azure Cloud Services

Azure Functions

Cosmos DB

AKS

CI/CD pipelines

Azure DevOps

Cloud security (OAuth2, JWT)

Mentoring

Communication skills

Tools

Azure DevOps

Cosmos DB

Azure Functions

AKS

Job description

Sound made by Sennheiser – For more than 80 years, we are among the world’s leading manufacturers of audio products, building the future of audio. We are proud of our finely engineered microphones and audio solutions that connect people and create remarkable sound experiences - whether in the studio, conference room, or on stage.
For us, the audio industry is one of the most exciting to work in. In our global family business, you can expect not only a unique team where we trust, value and support each other, but also the opportunity to make your own significant contribution to our collective progress.

Key Responsibilities

• Frontend Development & Architecture — Leads the development of responsive, intuitive interfaces using React, Angular, or Vue.js for web, and/or Flutter for cross-platform mobile, integrating frontend components cleanly into the broader stack and setting technical direction and best practices for the team.
• Backend & Cloud Development — Builds and maintains cloud-native backend services on Azure (Functions, App Services, Cosmos DB,AKS), leverages Azure Blob Storage, Media Services, and Event Hubs for audio file processing, and develops RESTful APIs, GraphQL endpoints, and WebSocket services for low-latency frontend-backend communication.
• Data & Performance — Designs and optimizes large-scale audio data storage using Azure SQL, Cosmos DB, and other NoSQL solutions, and owns performance, scalability, and security across the stack, with particular attention to real-time processing and low-latency operations.
• Leadership & Collaboration — Mentors junior and mid-level developers, leads technical reviews, and coordinates with product, design, engineering, and audio teams to deliver high-quality features, taking on broader technical responsibility and contributing to resourcing and planning decisions.
• Engineering Practices — Maintains and optimizes CI/CD pipelines with Azure DevOps, defines unit, integration, and end-to-end testing strategies, and champions security best practices to ensure compliance in managing audio content.

Required Qualifications

• 5–8 years of experience in fullstack development, including substantial frontend ownership, working on cloud-native applications.

depth in at least one.

• Strong knowledge of Flutter/Dart for cross-platform mobile app development.
• Proficiency in backend development using languages such as C#, Python, Node.js, or Go.
• Expertise in designing and consuming RESTful APIs and GraphQL services.
• Hands-on experience with Azure Cloud Services, including Azure Functions, App Services, Cosmos DB, and Azure Kubernetes Service (AKS).
• Familiarity with SQL and NoSQL databases, with practical experience using Azure SQL, Cosmos DB, or similar.
• Strong understanding of CI/CD pipelines and cloud-native development practices, particularly with Azure DevOps.
• Experience with cloud security practices, including Azure AD, OAuth2, JWT, and Azure Key Vault.
• Demonstrated ability to analyze and synthesize complex technical problems and solve them independently, adapting approach across both well-defined tasks and ambiguous, evolving requirements.
• Proven track record of mentoring, coordinating, or leading the work of other engineers.
• Excellent communication skills, able to convey complex technical information clearly to both technical and non-technical audiences and to influence decisions across teams.

Preferred Qualifications

• Experience working with audio-related technologies, such as the Web Audio API, audio streaming protocols, or media content handling.
• Familiarity with real-time audio processing and on-demand media delivery.
• Experience with Azure Media Services for audio/video processing and streaming.
• Knowledge of serverless architectures and event-driven design using Azure Event Grid, Service Bus, or Logic Apps.
• Experience working in agile development environments, with familiarity in Scrum or Kanban methodologies.
• Passion for audio technology and a deep understanding of the challenges and needs within the audio industry.

What you can expect from us:

• Inspiring Work Environment: Become a part of our international family business, where a modern and dynamic work atmosphere awaits you. At Sennheiser, people and their mindset are at the heart of everything we do - they are our most valuable asset.
• Flexible Working Models: We offer flexible working hours and mobile work options to help you balance your professional and personal life.
• International Collaboration: Look forward to working in a global team collaboration and contributing to exciting projects that shape the future of audio.

We welcome applicants from all backgrounds, regardless of gender identity, national origin, sexual orientation, ethnicity, religion, disability, or age.

Do you have any questions?
Please feel free to contact us at [e-mail].