Senior Full-Stack Engineer - OAuth & Secure Web Apps

Certara USA, Inc.; Upton (PA); On-site; USD 120,000 - 160,000; Full time

Job summary

Certara USA, Inc. is seeking a Senior Software Engineer on the Certara Admin team. You will design, implement, and maintain scalable web applications, contributing to secure auth flows and robust software delivery in an agile environment.

You will collaborate across product, test, and engineering teams, writing unit tests and participating in code reviews. The role emphasizes OAuth-based authentication and cross-functional teamwork within a dynamic, learning-oriented company.

Qualifications

• 4+ years of experience as a Software Programmer or Software Engineer.
• Solid understanding of OAuth 2.0 authentication and authorization protocols.
• Experience working in a highly collaborative software organization.

Responsibilities

• Develop and maintain features in software applications using Java, JavaScript, and PostgreSQL.
• Design and implement secure authentication and authorization flows using OAuth.
• Understand and apply applicable coding standards.
• Collaborate with members of the product, test, and software engineering organizations.
• Write unit tests as appropriate to new functionality.
• Participate in code and software review processes.

Skills

Java

JavaScript

PostgreSQL

OAuth 2.0

Tools

Keycloak

Job description

Certara USA, Inc. is seeking a Senior Software Engineer on the Certara Admin team. You will design, implement, and maintain scalable web applications, contributing to secure auth flows and robust software delivery in an agile environment.

You will collaborate across product, test, and engineering teams, writing unit tests and participating in code reviews. The role emphasizes OAuth-based authentication and cross-functional teamwork within a dynamic, learning-oriented company.