Senior Backend .NET Developer

Top 3 reasons to join us

• Premium Healthcare program for you and your family
• Monthly childcare support, Paternity Leave
• Frequent US working opportunities

Job description

Summary 

Join Aperia Solutions, a leader in SaaS solutions for the Payments and Compliance industries. Aperia is a Texas-based fintech and managed consultancy firm that creates custom SaaS applications and other software-based solutions for the payments, banking, and processing industry. Founded in 1999, Aperia offers business intelligence, risk management, compliance, and customer intelligence platforms. With offices in Dallas, Washington DC, and Vietnam, Aperia is a fast-paced, global organization that strives to improve efficiency in compliance, risk, and customer service operations. Aperia’s clients include banks, processors, payment facilitators, merchant service providers, independent sales organizations, and government entities. A career at Aperia promises a great challenge, culture, and opportunities to forge your own path. 
 

Job Description 

We are seeking a highly skilled and experienced Senior Backend .NET Developer to lead the design, development, and maintenance of scalable and secure API services. The ideal candidate will have deep expertise in C#, Open API specifications, Entity Framework, and cloud-based database technologies including both document-oriented (e.g., Cosmos DB, MongoDB) and relational (e.g., Azure SQL, PostgreSQL) systems. Experience with Docker container development is highly desired.
 

Core Responsibilities

• Design and implement robust, scalable, and secure RESTful APIs using C#/.NET Core.
• Define and maintain OpenAPI (Swagger) specifications for all services.
• Integrate and optimize data access using Entity Framework Core.
• Architect and manage cloud-based databases, both document and relational, ensuring performance and reliability.
• Develop and maintain Docker containers for consistent deployment across environments.
• Collaborate with cross-functional teams including front-end developers, DevOps, and product managers.
• Ensure code quality through unit testing, integration testing, and code reviews.
• Monitor and troubleshoot production issues, ensuring high availability and performance.
• Mentor junior developers and contribute to best practices and coding standards.

Your skills and experience

Required Skills

• 5+ years of professional experience in backend/API development using C#/.NET.
• Strong experience with OpenAPI/Swagger for API documentation and design.
• Proficiency in Entity Framework Core and LINQ.
• Hands-on experience with cloud platforms (Azure, AWS, or GCP), especially with cloud-native databases.
• Deep understanding of RESTful API principles, authentication/authorization (OAuth2, JWT), and API versioning.
• Experience with CI/CD pipelines, Git, and containerization (Docker/Kubernetes).
• Docker container development experience is highly desired.
• Excellent problem-solving skills and attention to detail.

Things that will separate you from the rest

• Experience with microservices architecture and event-driven systems.
• Familiarity with NoSQL databases like MongoDB, Cosmos DB, or Firebase.
• Knowledge of GraphQL or other API paradigms.
• Certifications in cloud technologies (e.g., Azure Developer Associate, AWS Certified Developer).

Education or Certifications

• Bachelor’s degree in Computer Science, Information Technology, or related field.  

Why you'll love working here

• Full salary for probation & full coverage of social insurance.
• Premium healthcare for you and your beloved one.
• Monthly childcare support
• 13th-month salary.
• Annual Leave: 15 days; Paternity Leave: 6 weeks, Bereavement leave: 10 days.
• Flexible working time, focus on output (no checking time attendance)
• Various active sporty clubs: Football, Billiards, Badminton, E-sport clubs
• Frequent opportunities to travel to US headquarter from 3-6 months.