Software Developer Sr

Dayforce

About The Position

We are looking for a Senior Software Developer to join the Dayforce Core Services team, where you will help modernize and evolve critical application components, support a large-scale SaaS platform, and contribute to AI-assisted engineering solutions that improve developer productivity and platform adoption.

Requirements

Proven expertise in C#, .NET Framework, .NET Core / modern .NET, and enterprise application development
Solid hands-on experience developing, maintaining, and modernizing applications across both .NET Framework and .NET Core / .NET
Demonstrated experience migrating applications from legacy .NET Framework to .NET Core / modern .NET
Experience across both backend services and web application components
Track record of building scalable SaaS or enterprise applications
Solid understanding of system design and distributed application concepts
Deep knowledge of SQL Server and relational databases
Experience designing and building microservices and containerized applications (Docker/Kubernetes)
Experience working with Azure or cloud-native architectures
Experience modernizing legacy applications and refactoring monolithic systems into more maintainable architectures
Strong understanding of modernization strategies, including dependency analysis, compatibility assessment, and incremental migration approaches
Familiarity with application framework patterns commonly found in mature enterprise web applications
Experience implementing observability, logging, and monitoring solutions
Experience working with CI/CD pipelines and DevOps practices
Strong problem-solving, troubleshooting, and debugging skills
Ability to balance delivery of new capabilities with technical debt reduction and platform modernization
Strong general proficiency in AI developer tooling, including Claude Code, Cursor, Windsurf, GitHub Copilot, and related tools.
Experience using AI-assisted development tools to accelerate coding, debugging, documentation, and workflow automation.
Ability to evaluate and adopt emerging AI engineering tools and integrate them effectively into day-to-day development practices.
Proficiency in English is required for this position as this role will regularly interact with English-speaking stakeholders, co-workers, managers and/or clients across the world.

Responsibilities

Design, build, and modernize scalable application components and platform services
Lead and contribute to migration initiatives from .NET Framework to .NET Core / modern .NET
Support modernization of existing application layers, including backend services and web application components
Analyze legacy application patterns and drive modernization approaches that improve maintainability, performance, and scalability
Solve performance, scalability, reliability, and compatibility challenges in production systems
Collaborate with cross-functional teams to deliver impactful platform and product capabilities
Drive technical design and architecture decisions
Mentor engineers and contribute to strong engineering practices
Build and leverage AI-assisted tools and agents to improve developer productivity and accelerate modernization efforts