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Back-end Developer

Design and deliver secure, high-performance, and scalable backend systems and APIs. Drive backend innovation across enterprise platforms with a collaborative engineering team.

Full-timeMakati Office · OnsiteApply at sales@cosmotech.com.ph
Role details

Build secure, high-performance backend systems for enterprise platforms.

We are seeking an experienced Backend Developer to design and deliver secure, high-performance, and scalable backend systems and APIs. This role involves optimizing data architectures, ensuring system reliability and security, and integrating enterprise platforms.

You will play a key role in driving backend innovation and collaborating with cross-functional teams to deliver robust, production-ready solutions.

Primary Responsibilities

  • Design, develop, and maintain server-side applications and APIs.
  • Write clean, efficient, and maintainable code following best practices and coding standards.
  • Work with relational and NoSQL databases to design schemas and optimize queries.
  • Design, optimize, and maintain relational data models — writing stored procedures, views, and indexes for peak performance.
  • Ensure API security, authentication, and authorization.
  • Enforce secure-coding best practices and robust audit-trail logging for all critical operations.
  • Improve the performance, scalability, and security of backend systems.
  • Integrate with third-party platforms, directory services, and message buses.
  • Ensure high availability and resilience: implement logging, metrics/monitoring, and exception handling.
  • Collaborate with frontend developers to integrate APIs and backend services.
  • Write comprehensive unit/integration tests and participate in code reviews, pair programming, and knowledge-sharing sessions.
  • Troubleshoot and resolve bugs, performance bottlenecks, and system failures.
  • Conduct and assist in performance and vulnerability assessment and testing.

Qualifications

  • Bachelor's degree in Computer Science, Information Technology, or related field (or equivalent experience).
  • 2–3 years of professional back-end development experience in C#/.NET Core (6+), delivering production-grade APIs.
  • 2–3 years of experience with PostgreSQL and working knowledge of MongoDB.
  • 2–3 years of experience in asynchronous programming, LINQ, and Entity Framework.
  • Strong SQL skills: schema design, T-SQL, performance tuning, and transaction management.
  • Strong understanding of RESTful API development and security best practices.
  • Familiarity with file storage and processing.
  • Experience with real-time features and background jobs.
  • Knowledge of unit testing frameworks (e.g., xUnit, NUnit) and mocking tools.
  • Experience with authentication/authorization systems, including JWT and role-based access control.
  • Comfortable with version control workflows and agile best practices.

Ready to apply?

Send your CV, a short intro, and links to relevant work for the Back-end Developer role.

Email sales@cosmotech.com.ph

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