Senior Backend Engineer – Scalable SaaS APIs

Classpass; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Classpass is seeking a backend engineer to build and improve backend services for a large-scale platform used by businesses and consumers. You will design reliable APIs and microservices, partner with product, design, and QA to shape architecture, and deliver end-to-end features with a focus on long-term maintainability and user experience.

You will contribute to roadmap discussions, apply disciplined engineering practices including automated testing and monitoring, and champion code quality and

Qualifications

• Significant experience building and scaling backend systems for large SaaS products.
• Strong object-oriented programming experience, such as with Java or C#.
• Experience designing service-oriented and microservice architectures.
• Understanding of software development lifecycle practices, design patterns, and Agile ways of working.
• Familiarity with monitoring and observability tools; examples include New Relic and Kibana.
• Clear professional communication and a collaborative, detail-oriented approach.

Responsibilities

• Design and build reliable, scalable APIs and microservices that support core platform features.
• Collaborate across product, design, and quality assurance to refine architecture and deliver complete solutions.
• Apply engineering practices such as automated testing, code review, and proactive monitoring to support reliability.
• Contribute technical input to roadmap planning and system design discussions.
• Assess feature impact and risks, incorporating feedback to improve code quality and team collaboration.

Skills

Backend development

Java/C#

Microservices design

OO programming

Agile practices

Code review

Tools

New Relic

Kibana

Job description

Classpass is seeking a backend engineer to build and improve backend services for a large-scale platform used by businesses and consumers. You will design reliable APIs and microservices, partner with product, design, and QA to shape architecture, and deliver end-to-end features with a focus on long-term maintainability and user experience.

You will contribute to roadmap discussions, apply disciplined engineering practices including automated testing and monitoring, and champion code quality and