Lead Front End Developer

🛠️Are you a hands-on React leader who enjoys owning front-end architecture while staying close to backend system design?

We are hiring a Lead Full Stack Developer with a strong front-end focus to lead UI architecture and development across our enterprise applications. This role requires deep, hands-on expertise in React and modern front-end engineering practices, along with solid backend experience in C#, ASP.NET Core, Entity Framework, and SQL Server.

While this is a full-stack position, the primary responsibility is ownership of the front-end architecture, defining standards, modernizing legacy UI layers, and building scalable, high-performance React applications. Backend expertise is essential to ensure effective API design, data modeling alignment, and end-to-end system performance within a Microsoft technology stack.

This is a high-impact opportunity within an established U.S.-based financial/professional services organization that has spent over 30 years delivering financial audit and cost-recovery solutions to Fortune 500 clients.

💻 Who You Are:   

• A senior full-stack engineer who has led architectural direction within complex enterprise environments
• A front-end–leaning technical leader with deep, hands-on expertise in React, responsible for designing and scaling production-grade UI platforms
• Proven experience modernizing legacy or monolithic applications into modular, maintainable, service-oriented architectures
• Equally comfortable defining architectural standards and contributing high-quality production code
• Strong command of API design, data modeling, and backend performance optimization within the Microsoft stack
• Experienced leading distributed engineering teams and driving technical alignment across cross-functional stakeholders
• Pragmatic in execution, able to balance long-term architectural integrity with delivery timelines and business priorities

📍 Work Type: 

• Location: Ontario (Remote)  
• Vacancy Type: This role is a newly created position 

Requirements

🎯 What You’ll Do:

• Lead the architecture and implementation of scalable React applications using TypeScript and modern design patterns
• Establish reusable component libraries and enforce UI engineering standards
• Drive migration of legacy UI systems to modern React-based solutions
• Implement advanced state management patterns such as Redux or Context API
• Optimize client-side performance, rendering efficiency, and application scalability
• Design and enhance RESTful APIs using ASP.NET Core
• Develop and optimize data access layers using Entity Framework
• Write and tune complex SQL queries, stored procedures, and indexing strategies
• Ensure efficient data flow between UI and backend services
• Lead the evolution of a shared .NET codebase toward scalable, service-oriented architecture
• Establish standards for maintainability, security, and performance across the stack
• Guide CI/CD practices and branching strategies using Azure DevOps
• Mentor developers, conduct code reviews, and elevate overall engineering quality
• Collaborate with product leadership to translate business requirements into robust technical solutions
• Support production stability through troubleshooting and performance optimization
• Collaborate on the integration of AI-powered capabilities into user workflows where appropriate
• Contribute to the implementation of AI-enhanced features leveraging Azure AI Services or OpenAI APIs when required
• Identify opportunities to improve internal engineering productivity through responsible AI tooling

⭐ What We’re Looking For:

• A minimum of 7 years of progressive full-stack software development experience in enterprise environments
• Proven experience as a Lead Developer, Technical Lead, or Principal Engineer
• Deep, hands-on expertise in React (mandatory), including Hooks, functional components, TypeScript, modern JavaScript (ES6+), state management, and UI performance optimization
• Strong backend experience with C#, ASP.NET Core, Entity Framework, and SQL Server (data modeling, query optimization, indexing, performance tuning)
• Experience designing and consuming RESTful APIs within distributed systems
• Familiarity with Microsoft Azure and Azure DevOps CI/CD pipelines
• Demonstrated success modernizing legacy enterprise systems
• Strong understanding of enterprise security and authentication/authorization frameworks
• Excellent communication, leadership, and stakeholder engagement skills, with the ability to influence technical direction and drive engineering excellence
• Exposure to integrating AI or ML services into enterprise applications (Azure AI, OpenAI APIs, or similar) is considered an asset

🔥 What Makes This Role Exciting 

• True Technical Ownership: Lead the design and evolution of enterprise-scale React applications within a complex full-stack ecosystem 
• AI-First Innovation: Opportunity to embed AI into real enterprise workflows 
• Transformation Stage: Shape the next generation of a 30-year-established organization 
• High Visibility: Your work directly impacts enterprise clients and internal growth

Benefits

• Base Salary: $140,000 – $170,000  
• Paid Time Off: Competitive vacation and personal days to maintain a healthy work-life balance 
• Comprehensive Health Benefits: Medical, dental, and vision benefits to support your overall well-being 
• Bonus eligibility
• Flexible work arrangements
   

📩 Ready to Elevate Your Career? Apply Now!  

At  STACK IT Recruitment, we connect top talent with standout opportunities. If you meet at least 70% of the qualifications, we encourage you to apply for it. We’d love to chat!  

Know someone perfect for this role? Share this with your network, you might just help someone take the next big step in their career.  

✨ We’re proud to support diversity and inclusion. Need accommodation during the hiring process? Just let us know; we are here to support you! 

AI Use Disclosure:    

STACK IT uses AI-enhanced tools to support initial candidate screening and interview note analysis. All assessments and hiring decisions remain human-led.