Senior Back-End Developer

Summary

Join Appspace as a Senior Back-End Developer and take ownership of backend features, from design to delivery. Collaborate with cross-functional teams to build reliable, performant, and maintainable software. Drive backend strategy, contribute to engineering culture, and continuously improve software development processes. This role requires expertise in .NET, building secure and scalable APIs, and working with relational and NoSQL databases. The ideal candidate thrives in a collaborative environment, enjoys mentoring, and stays curious about new technologies. Appspace offers a flexible work culture and various benefits.

Requirements

• 5+ years of experience building and delivering enterprise-grade applications using an object-oriented language
• Solid experience with .NET Framework and ASP.NET (we don’t count years here—just skill)
• Strong hands-on experience with MVC, Web API frameworks (ASP.NET or similar), and RESTful APIs
• Familiarity with ORM frameworks like Entity Framework, NHibernate, or similar
• Proficiency in relational database design and SQL querying
• Deep understanding of SOLID principles and how to apply them in real-world projects
• Solid testing chops—unit, integration, API, and performance testing are part of your flow
• A strong communicator with great interpersonal skills—able to work with teams across geographies and disciplines
• Focused on writing maintainable, testable, well-crafted code using design patterns and best practices
• Passionate about clean code and craftsmanship (TDD, BDD, Calisthenics—we speak your language)

Responsibilities

• Own and drive product features from technical design to delivery, collaborating closely with Product, QA, and other stakeholders
• Tackle tech debt head-on—identify weak spots and propose real, scalable solutions
• Write clean, testable, and high-performance code that follows our internal standards and makes future-you proud
• Contribute to milestones by ensuring every piece of code meets our Definition of Done (DoD)
• Share technical ideas and solutions in a way that’s easy for the whole team to understand and rally around
• Stay curious—research and test new tools, frameworks, and strategies to keep our stack modern and efficient

Preferred Qualifications

• Experience with SharePoint and Office 365 development
• DevOps experience and CI/CD mindset
• Familiarity with OAuth, OpenID, and modern authentication protocols
• Experience with GraphQL APIs
• Knowledge of NoSQL databases (e.g., document-based or key-value stores)
• Exposure to Microservices or Modular Monolith architecture
• Understanding of advanced architectural patterns (DDD, Onion, Hexagonal, Ports & Adapters, CQRS)
• Experience with cloud-native applications and Azure cloud services
• Familiarity with event-driven systems (Kafka, RabbitMQ, etc.)
• Experience working with containerized applications (Docker)

Benefits

• Competitive salaries
• Employer paid medical, dental and vision coverage
• Mental health resources
• Flexible work schedules
• Remote work opportunities
• A casual dress work environment
• Reduced working hours in August
• Appspace Quiet Fridays (No non-essential internal meetings scheduled)
• Gym allowance
• Training allowance
• Training days off