Lead architecture and technical roadmap for a fintech platform: design and implement scalable, secure distributed systems and APIs; build proof-of-concepts; drive migration and modernization; lead IAM and multi-tenant SSO architecture; mentor senior engineers; collaborate with product and business stakeholders; maintain architecture documentation and best practices.
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
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