Principal Software Engineer — FinTech Platform (High Volume)

thrively; California (MO); On-site; USD 180,000 - 240,000; Full time

Job summary

Thrively is seeking a Senior Principal Software Engineer to own the architecture and technical direction of a high-volume financial platform. You’ll stay hands-on while guiding APIs, microservices, and overall engineering standards to scale a 500–800 TPS system.

You’ll collaborate with Product, Architecture, and Engineering to build secure, reliable systems, driving security, observability, and performance improvements across the stack.

Qualifications

• 12+ years of hands-on software engineering experience.
• At least 5 years of technical leadership experience.
• Advanced experience with C#, .NET, and SQL.
• Strong hands-on experience with Azure and cloud-native architecture.
• Experience with Azure services such as APIM, Azure SQL, Cosmos DB, and Key Vault.
• Deep understanding of RESTful APIs, OAuth2, and OpenAPI.
• Strong experience with microservices and event-driven architectures.
• Experience with technologies such as Azure Service Bus and Event Hubs.
• Strong understanding of containers, caching, Git, DevOps, and CI/CD.
• Experience implementing observability using platforms such as Datadog or Grafana.
• Ability to troubleshoot complex production systems and perform structured root-cause analysis.
• Strong communication, technical leadership, and mentoring skills.

Responsibilities

• Own the architecture and technical direction of the APIs and microservices underpinning the platform, setting standards other teams build against
• Design scalable, secure, and high-performance software systems
• Make high-level architectural decisions and establish coding standards, design patterns, and engineering principles
• Refactor and extend existing systems while designing for long-term flexibility and scalability
• Develop prototypes and proofs-of-concept to evaluate new technologies and reduce implementation risk
• Drive best practices across code reviews, CI/CD, automated testing, and observability
• Build and improve monitoring and alerting capabilities to support SLA requirements
• Lead incident response and root-cause analysis for complex production issues
• Help ensure mission-critical, customer-facing applications remain reliable and performant
• Champion security and compliance best practices across the platform
• Partner with Product Managers, Architects, and Engineering teams to translate business requirements into technical solutions
• Mentor engineers and help raise engineering standards across the organization
• Drive long-term technical strategy and architectural decision-making
• Evaluate and introduce new technologies, frameworks, and development methodologies
• Work within an AI-driven SDLC environment using tools such as GitHub Copilot

Skills

C#/.NET

Azure

SQL

REST APIs

OpenAPI

Microservices

Event-driven

DevOps

CI/CD

Observability

Git

Tools

Azure

Datadog

Grafana

GitHub Copilot

Azure Service Bus

Job description

Thrively is seeking a Senior Principal Software Engineer to own the architecture and technical direction of a high-volume financial platform. You’ll stay hands-on while guiding APIs, microservices, and overall engineering standards to scale a 500–800 TPS system.

You’ll collaborate with Product, Architecture, and Engineering to build secure, reliable systems, driving security, observability, and performance improvements across the stack.