Senior Software Engineer (.NET Core)

About Sinch

Sinch is pioneering the way the world communicates. More than 150,000 businesses — including Google, Uber, Paypal, Visa, Tinder, and many others — rely on Sinch’s Customer Communications Cloud to power engaging customer experiences through mobile messaging, voice, and email. 

Whether you need to verify users or craft omnichannel campaigns, Sinch makes it easy. Our AI-infused Super Network, APIs, and applications ensure you can connect with your customers reliably and securely, at every step of their journey. 

At Sinch we “Dream Big”, “Win Together”, “Keep it simple”, and “Make it Happen”. These values are our foundation! 

Description

We are a forward-thinking team creating cutting-edge, cloud-based communication solutions. Our backend systems leverage the latest C# and .NET Core technologies, deployed in Kubernetes on AWS. We thrive on collaboration, innovation, and crafting scalable, reliable systems that power seamless communication worldwide.   

If you’re a Senior Backend Engineer with a passion for problem-solving, clean code, and modern DevOps practices, we’d love to have you on our team.   

As a Senior Backend Engineer, you’ll take ownership of developing and maintaining high-performing backend systems while contributing to all stages of the software lifecycle. In this role, you will:   

• Develop scalable and resilient distributed systems using C# and .NET Core. 

• Work closely with engineers, DevOps specialists, and product managers in an agile, cross-functional team.   

• Build and maintain applications running on Kubernetes, actively monitor production systems, and ensure reliability. 

• Leverage AWS tools and services to deploy, optimize, and scale cloud-based systems.   

• Write clean, testable, and maintainable code, with a focus on system performance and scalability.   

• Enhance automation, streamline CI/CD pipelines, and troubleshoot issues proactively.   

• Influence architectural decisions and actively contribute to enhancing our development and operational practices.   

Requirements 

• Major professional experience building and maintaining backend systems in production.   

• Expertise in C#, .NET Core, and developing distributed systems.   

• Solid understanding of DevOps principles and experience with CI/CD pipelines.   

• Strong communication skills and a collaborative mindset.   

• A passion for clean, testable code and modern software practices.   

Good to have 

• Service-oriented architecture and microservices.   

• Relational and NoSQL databases (e.g., MySQL, MSSQL, Redis). 

• Hands-on experience with Kubernetes and AWS.   

• Incident response and on-call rotations.   

• Proficiency in additional programming languages such as C++, Python, or Kotlin   

• Experience with Asterisk and VoIP protocols, preferably SIP.  

Embrace the challenge and join us!

Our Hiring Process

We are committed to ensuring a recruitment process that is fair, objective, consistent, and inclusive. Our approach includes structured, competency-based interviews designed to evaluate your skills, experience, and qualifications relevant to the role. At times, we may include a data-driven assessment to enhance our hiring success and identify candidates likely to excel.  

We believe in a two-way process and encourage you to ask questions throughout the journey.  If this role isn't what you're looking for, please explore the other opportunities listed on our career page: . No matter who you are, we hope you find an exciting path forward - hopefully with us!