Senior Fullstack Developer (.NET & React, AWS)

TL;DR

Senior Fullstack Developer (.NET & React, AWS): Building and evolving scalable, cloud-native applications that support fleet optimization and operational efficiency with an accent on front-end and back-end system development. Focus on delivering high-quality solutions, collaborating with cross-functional teams, and ensuring system performance and scalability on AWS.

Location: Hybrid in Sofia, Sofia City Province, Bulgaria

Company

hirify.global is a dynamic tech service provider, established in 2011, supporting enterprise clients worldwide with a global team across Europe, the United States, and Argentina.

What you will do

• Develop and maintain end-to-end features across React front-end and .NET back-end services.
• Build scalable, maintainable APIs and business logic supporting fleet optimization workflows.
• Implement responsive, user-friendly interfaces with a strong focus on performance and usability.
• Integrate applications with cloud infrastructure, data platforms, and enterprise systems.
• Collaborate with Solution Architects to implement architectural patterns and ensure code quality through reviews and automated testing.
• Troubleshoot, optimize, and improve system performance, reliability, and scalability on AWS.

Requirements

• 5+ years of experience in full-stack software development.
• Strong hands-on experience with .NET (C#) for backend services and APIs.
• Solid experience building modern front-end applications using React.
• Proven experience designing and consuming RESTful APIs.
• Good understanding of cloud-native application development on AWS and experience with relational/NoSQL databases.
• Strong understanding of software engineering best practices and experience working in agile, cross-functional teams.

Nice to have

• Experience with microservices architectures.
• Familiarity with AWS services such as ECS/Fargate, Lambda, API Gateway, S3, SNS/SQS.
• Experience with event-driven architectures, CI/CD pipelines, and Infrastructure as Code (Terraform or CloudFormation).
• Experience integrating frontend applications with data or analytics platforms.
• Familiarity with authentication and authorization mechanisms (OAuth2, JWT, enterprise SSO) and high-load/enterprise-scale systems.

Culture & Benefits

• Continuous learning and career growth opportunities.
• Flexible working hours.
• Inclusive and supportive culture.