Sr Software Engineer - Backend Engineer | IND - Five9

About Five9

Five9 is a global leader in cloud software for the enterprise contact center market, powering billions of customer interactions annually. Since 2001, Five9 has been at the forefront of the cloud revolution, helping organizations deliver exceptional customer experiences, improve productivity, and achieve measurable business outcomes. 

We are expanding our engineering and delivery teams in Bangalore and are seeking passionate professionals to help design, implement, and scale Five9’s next-generation cloud-native services

Overview

We are looking for a highly skilled Full-Stack Developer with expertise in .NET Core, to develop and maintain scalable web applications and microservices. The ideal candidate will have strong problem-solving skills, experience in modern software development, and a passion for creating robust, high-performance applications.

Key Responsibilities

Backend Development:

• Design, develop, and maintain microservices and APIs using .NET Core. Should have a good understanding of .NET Framework.
• Implement RESTful APIs, ensuring high performance and security.
• Optimize database queries and design schemas for SQL Server / Snowflake / MongoDB.

Software Architecture & DevOps:

• Design and implement scalable microservices architecture.
• Work with Docker, Kubernetes, and CI/CD pipelines for deployment and automation.
• Ensure best practices in security, scalability, and performance.

Collaboration & Agile Development:

• Work closely with UI/UX designers, backend engineers, and product managers.
• Participate in Agile/Scrum ceremonies, code reviews, and knowledge-sharing sessions.
• Write clean, maintainable, and well-documented code.

Qualifications & Skills

• 7+ years of experience as a Full-Stack Developer.

• Strong experience in .NET Core, C#.

• Proficiency in React.js, JavaScript (ES6+), TypeScript.

• Experience with RESTful APIs, Microservices architecture.

• Knowledge of SQL / NoSQL databases (SQL Server, Snowflake, MongoDB).

• Experience with Git, CI/CD pipelines, Docker, and Kubernetes.

• Familiarity with Cloud services (Azure, AWS, or GCP) is a plus.

• Strong debugging and troubleshooting skills

Nice to Have

• Experience with GraphQL, gRPC, or WebSockets

• Knowledge of authentication/authorization frameworks (OAuth, JWT, Identity Server)

• Exposure to serverless architecture and cloud-native best practices

• Background in automated testing (unit, integration) 

Why Five9

At Five9, we believe that technology is only as powerful as the people behind it. You’ll be part of a team that values collaboration, innovation, and accountability, and you’ll have the opportunity to make a meaningful impact on how global enterprises engage with their customers.