YOU MUST BE LEGALLY AUTHORIZED TO WORK IN THE UNITED STATES

About the Role
We are looking for a Senior Software Engineer (Back-End) to play a key role in building and optimizing our .NET Core API and AWS cloud infrastructure. This is a hands-on development role, where you will actively contribute to coding, designing scalable architecture, and optimizing APIs that power our Vending Management Software (VMS) and related applications.
Our back-end is built as a rest API, deployed with AWS ECS, leveraging AWS SQS for event-driven processing, Lambda for server-less workflows, and PostgreSQL for data persistence. You will work closely with front-end, DevOps, and product teams to deliver scalable, high-performance solutions in a cloud-native environment.

Responsibilities

• Develop & Optimize APIs: Design, build, and maintain .NET Core (C#) APIs and microservices with a focus on scalability, performance, and reliability.
• Event-Driven Architecture: Implement AWS SQS and Lambda functions for asynchronous workflows and real-time processing.
• Database Development & Performance Tuning:
• Design efficient database schemas and optimize queries for PostgreSQL.
• Implement best practices for indexing, partitioning, and transaction handling.
• Scalability & Reliability:
• Develop solutions that scale horizontally within AWS ECS.
• Optimize performance through caching strategies, API response tuning, and concurrency management.
• Security & Best Practices:
• Implement authentication and authorization using OAuth, JWT, and IAM policies.
• Follow security best practices for data encryption, API protection, and access control.
• Testing & Code Quality:
• Write unit, integration, and performance tests to ensure system stability.
• Participate in code reviews and best practice discussions to maintain high engineering standards.
• CI/CD & Deployment:
• Work with GitHub Actions, Terraform, and AWS ECS to deploy and manage APIs in a containerized environment.
• Ensure robust monitoring and logging through AWS CloudWatch, distributed tracing, and log aggregation tools.
• Collaboration & Problem-Solving:
• Work cross-functionally with front-end, DevOps, and product teams to align technical solutions with business needs.
• Debug and resolve complex back-end issues in a distributed environment.

Requirements

• 8+ years of hands-on back-end development experience, with expertise in .NET Core (C#).
• Strong understanding of microservices, API design, and distributed systems.
• Proven experience with PostgreSQL, including query optimization and schema design.
• Hands-on experience with AWS services, particularly ECS, SQS, Lambda, and IAM.
• Experience developing event-driven applications using message queues like AWS SQS.
• Proficiency in RESTful API development, authentication (OAuth, JWT), and security best practices.
• Experience with CI/CD pipelines, Git, and infrastructure automation.
• Ability to interpret technical documentation and work with industry protocols (e.g., NAMA VDI, DEX Protocol, or similar).

Preferred Qualifications

• Experience with Infrastructure as Code (Terraform, CloudFormation, or Pulumi).
• Experience building machine learning models
• Familiarity with Kafka or RabbitMQ for messaging beyond SQS.
• Exposure to serverless architectures (Step Functions, API Gateway).
• Background in performance monitoring, tracing, and log management in cloud environments.
• Experience with vending machine protocols (NAMA VDI, DEX, or similar standards).

• Develop & Optimize APIs: Design, build, and maintain .NET Core (C#) APIs and microservices with a focus on scalability, performance, and reliability.
• Event-Driven Architecture: Implement AWS SQS and Lambda functions for asynchronous workflows and real-time processing.
• Database Development & Performance Tuning:
• Design efficient database schemas and optimize queries for PostgreSQL.
• Implement best practices for indexing, partitioning, and transaction handling.
• Scalability & Reliability:
• Develop solutions that scale horizontally within AWS ECS.
• Optimize performance through caching strategies, API response tuning, and concurrency management.
• Security & Best Practices:
• Implement authentication and authorization using OAuth, JWT, and IAM policies.
• Follow security best practices for data encryption, API protection, and access control.
• Testing & Code Quality:
• Write unit, integration, and performance tests to ensure system stability.
• Participate in code reviews and best practice discussions to maintain high engineering standards.
• CI/CD & Deployment:
• Work with GitHub Actions, Terraform, and AWS ECS to deploy and manage APIs in a containerized environment.
• Ensure robust monitoring and logging through AWS CloudWatch, distributed tracing, and log aggregation tools.
• Collaboration & Problem-Solving:
• Work cross-functionally with front-end, DevOps, and product teams to align technical solutions with business needs.
• Debug and resolve complex back-end issues in a distributed environment