Senior Technical Lead

Role Summary Seeking a senior Technical Lead with strong expertise in C#, NET, React, Cloud Technologies, Microservices, Security, and DevOps to architect, design, and lead delivery of enterprise-grade applications across on-premises, hybrid, and cloud environments. The architect will define technical direction, apply proven architecture and design patterns, lead to hybrid modernization efforts, and drive scalable, secure, and high-performance software solutions.

Role: Senior Technical Lead

Location: Sacramento, CA (1st Preference)/Walnut Creek, CA/ San Francisco, CA

Work Mode: Hybrid (3 days onsite)

Duration: Contract to Hire

Visa: Independent Visas

Role Summary

Seeking a senior Technical Lead with strong expertise in C#, .NET, React, Cloud Technologies, Microservices, Security, and DevOps to architect, design, and lead delivery of enterprise-grade applications across on-premises, hybrid, and cloud environments. The architect will define technical direction, apply proven architecture and design patterns, lead to hybrid modernization efforts, and drive scalable, secure, and high-performance software solutions.

• Define and own solution architecture for enterprise applications built on C#, .NET, and React.
• Apply architecture and design patterns (layered, hexagonal, CQRS, event sourcing, saga, API gateway, strangler fig, and GoF patterns) to deliver maintainable, extensible solutions.
• Architect and implement Microservices, REST APIs, and cloud-native applications.
• Design scalable, secure, and highly available distributed systems.
• Lead hybrid modernization and cloud migration initiatives, including assessment, target-state architecture, and phased transition of legacy and on-premises workloads.
• Embed security into architecture and delivery: threat modeling, identity and access management (OAuth2/OIDC), secure API design, secrets management, data protection, and compliance with OWASP and enterprise security standards.
• Drive performance optimization across the stack: application profiling, caching, asynchronous processing, database tuning, and front-end optimization for React applications.
• Build and optimize CI/CD pipelines for automated deployment and delivery.
• Collaborate with engineering teams and stakeholders to define application architecture and technology standards.
• Troubleshoot complex application performance, scalability, and reliability issues.
• Conduct architecture and code reviews and enforce engineering best practices.

Backend Development

• Expert in C# and .NET/.NET Core
• Experience building Enterprise APIs
• Strong knowledge of Object-Oriented Design and design patterns
• Experience with Distributed Systems and Microservices Architecture

Frontend Development

• Strong experience with React and JavaScript/TypeScript
• Experience designing front-end architecture (component design, state management, micro-frontends)
• Front-end performance optimization (code splitting, lazy loading, rendering and bundle optimization)

Cloud & Infrastructure

• Hands-on experience with Microsoft Azure or AWS
• Cloud-native application development
• Hybrid cloud and cloud migration experience
• Hybrid modernization experience: re-hosting, re-platforming, and re-architecting legacy applications for cloud and hybrid environments

Security

• Application and cloud security architecture (threat modeling, OWASP Top 10, secure SDLC)
• Authentication and authorization (OAuth2, OpenID Connect, JWT, RBAC), secrets and key management
• Data encryption, network security, and compliance practices

DevOps & Automation

• CI/CD pipeline implementation
• Infrastructure as Code (Terraform, Ansible)
• Containerization using Docker
• Container orchestration using Kubernetes

Databases

• Strong experience with SQL Server
• Knowledge of NoSQL databases such as MongoDB
• Database performance tuning and optimization

Architecture & Design Patterns

• Architecture and design patterns (GoF, enterprise integration, CQRS, saga, API gateway)
• Microservices Architecture
• Event-Driven Architecture
• Domain-Driven Design (DDD)
• API Design and Integration Patterns

Performance Optimization

• Performance engineering and optimization across application, database, and front-end layers
• Load and performance testing, profiling, monitoring, and observability (e.g., Application Insights, Prometheus, Grafana)
• Scalability and capacity planning

Development Practices

• Agile Development (Scrum/Kanban)
• Source Control (Git)
• Work Management Tools (Jira)
• Automated Testing and Quality Engineering Practices

Experience Requirements

• 10 to 12 years of software engineering experience, including significant experience in a solution or technical architect role.
• Proven expertise in C#, .NET, React, Azure/AWS, Microservices, Security, and DevOps.
• Experience designing and delivering large-scale enterprise applications using established architecture and design patterns.
• Experience leading hybrid modernization and cloud migration programs.
• Experience working in cloud or hybrid-cloud environments.

Demonstrated experience in security architecture and performance optimization of enterprise systems.