Software Developer Sr
About The Position
Our HR API Platform is the foundation of the Dayforce product—powering critical workflows that impact over 7,100 customers and process more than 2 billion API requests annually. As a Senior Software Developer (HR API Platform), you will play a key role in evolving this foundation to meet the demands of a modern, real-time, multi-region SaaS ecosystem. This includes handling complex inbound and outbound integrations, ensuring low-latency performance, and enabling scalable, event-driven architectures. You’ll work within a fast-moving, high-performance engineering team with strong technical standards and real ownership. Engineers here design, build, and operate their services end-to-end—and have a direct influence on both technical and product decisions. This is a chance to solve meaningful, large-scale problems in a domain that matters: ensuring people get paid accurately and on time. The systems you build will have a direct, daily impact on millions of users.
Requirements
- Strong expertise in C# and modern .NET (Core/.NET 8+)
- Deep experience building and optimizing RESTful APIs at scale
- Strong understanding of distributed systems, microservices architecture, and cloud-native design
- Proven ability to diagnose and improve performance (profiling, bottleneck analysis, memory/CPU optimization)
- Experience with relational databases (e.g., SQL Server) and query optimization
- Proficiency with modern JavaScript frameworks (React, Angular, or Vue) for full-stack collaboration
- Experience with unit, integration, and performance testing frameworks
- Hands-on experience with concurrency, async programming, and high-throughput systems
- Solid understanding of API security (OAuth2, OpenID Connect, rate limiting, threat mitigation)
- Experience building and operating services in cloud environments (AWS, Azure, or GCP)
- Familiarity with containerization and orchestration (Docker, Kubernetes)
- Experience with messaging/event systems (Kafka, RabbitMQ, or similar)
- Knowledge of caching layers (Redis, CDN strategies)
- Experience with CI/CD pipelines and DevOps practices
- Strong observability mindset (OpenTelemetry, Prometheus, Grafana, etc.)
- Familiarity with API gateways and service mesh concepts
- Practical experience using tools like GitHub Copilot and/or Claude Code to improve productivity
- Ability to critically evaluate AI-generated code for correctness, security, and performance
- Strong collaboration skills in Agile environments
- Excellent communication and documentation abilities
- Self-starter mindset with a focus on ownership and outcomes
Nice To Haves
- Experience designing and operating high-availability public API platforms at enterprise scale
- Experience with GraphQL in production environments
- Background in platform engineering or developer experience (DX)
- Experience with multi-region deployments and global traffic management
Responsibilities
- Build and operate high-performance, scalable API services
- Own services end-to-end (design, delivery, production)
- Define and improve API SLIs/SLOs, latency, and throughput
- Drive adoption of event-driven, eventually consistent architecture
- Decouple core HR data services from downstream systems
- Design and deliver a new GraphQL service layer
- Improve scalability via caching, async processing, and data access optimization
- Implement observability (metrics, logs, tracing) and act on insights
- Mentor engineers in system design and performance
- Partner with SRE/DevOps on CI/CD and production operations
- Use AI tools (Copilot, Claude Code) in day-to-day development
Benefits
- competitive pay
- excellent time away from work programs
- comprehensive wellness initiatives
- recognition
- volunteer days
- charity support (Dayforce Cares)
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
