Senior Software Architect / Senior Software Engineer

Senior Software Engineer/Architect – Fintech Innovation Partnered with RNG

Our client is a fast-paced, growth-oriented fintech company transforming how retail banks and credit unions deliver financial wellness to their members. Their culture thrives on ownership, speed, and solving meaningful problems at scale — and through our partnership with them, RNG is excited to help find their next Senior Software Architect to take the platform to the next level.

This role is for a builder — someone who can think strategically, architect boldly, and still roll up their sleeves to make ideas real. You’ll help design, scale, and ship features fast across a platform that’s reshaping the financial landscape.

Tech Stack Snapshot

• Frontend: React (primary), Blazor (minimal)
• Backend: .NET Core, C#, ASP.NET
• Database: Microsoft SQL Server, Cosmos DB, Redis
• Cloud & Services: Microsoft Azure, Docker

What You’ll Do

• Lead architectural strategy and long-term technical roadmap
• Build and test proof-of-concept applications and functionality
• Design scalable, secure, distributed systems that keep pace with rapid growth
• Drive platform evolution through migration strategies and modernization initiatives
• Lead backend API strategy and integrations with other fintech products and banking platforms
• Mentor senior engineers, conduct architecture reviews, and champion best practices
• Collaborate across product, design, business stakeholders, and technical counterparts
• Research and evaluate emerging technologies, frameworks, and architectural patterns
• Create and maintain architectural documentation, coding standards, and technical guidelines
• Contribute to a fast, agile, engineering-driven culture that loves to experiment and move quickly

?? Quarterly travel required to our client’s headquarters in Nashville, TN, for strategic planning sessions.

What We’re Looking For

• 8+ years of hands-on software development experience, including 3+ years in architectural roles
• Deep expertise in distributed system design, microservices architecture, and cloud-native platforms
• Advanced proficiency in C#, .NET Core, React.js, TypeScript, and modern web technologies
• Extensive experience with Azure cloud services, containerization (Docker), and DevOps practices
• Strong database background — both relational (SQL Server) and NoSQL (Cosmos DB)
• Proven track record of making smart architectural decisions in high-scale, high-availability environments
• Experience with API design, GraphQL, event-driven architectures, and integration patterns
• Hands-on experience building SSO authorization and authentication systems (SAML, OAuth 2.0) (see more below)
• Excellent communication and collaboration skills in remote-first environments
• A mentor’s mindset — you love helping senior engineers level up

A bit more detail about what we're looking for...

Identity & Access Management (IAM) Architecture

• 5+ years hands-on experience designing and implementing Identity Provider (IdP) solutions
• Deep expertise with Duende IdentityServer (or similar: IdentityServer4, Auth0, Okta) in production environments
• Advanced knowledge of OAuth 2.0 flows (authorization code, client credentials, PKCE) and OpenID Connect (OIDC)
• Proven experience implementing SAML 2.0 SSO integrations, including signature verification and assertion processing
• Experience with JWT-Secured Authorization Requests (JAR), JWK key management, and token lifecycle management
• Strong understanding of claims-based identity, token validation, and secure redirect URI handling

Multi-Tenant Integration Architecture

• Experience building scalable, multi-tenant SSO platforms serving 50+ unique client configurations
• Expertise in secure credential management (Azure Key Vault, Cosmos DB secrets storage)
• Understanding of per-tenant configuration isolation and dynamic client registration
• Experience with external IdP integrations where your platform acts as a Service Provider (SP)

Bonus Points

• Background in startups or fast-moving teams
• Experience working on financial or fintech products

Why You’ll Love This Opportunity

• Strategic impact: Shape the technical direction of a rapidly growing fintech platform
• Remote flexibility: 100% remote work with quarterly in-person collaboration
• Modern tech: Work with cutting-edge technologies and architect next-gen solutions
• High impact: Join a lean, ambitious team where your decisions truly move the needle
• Fast, fun, fearless: Less red tape — more building, shipping, and learning