Fintech Senior Software Engineer Jobs in California

Location: Remote; candidates must be based in or near Los Angeles, CA
Employment Type: Contract-to-hire, with potential to convert to full-time later this year
Pay Rate: $70–$75 per hour

Russell Tobin is partnering with a leading financial technology organization to hire a Senior Software Engineer for its Banking-as-a-Service team.

This individual will support partner onboarding and ongoing enhancements to a scalable BaaS platform. The Senior Software Engineer will design, develop, and maintain secure, high-performance systems that enable embedded financial services across a growing partner ecosystem.

The ideal candidate has a strong background in fintech, API and microservices development, Microsoft technologies, and Azure cloud services. This role also requires technical leadership experience and the ability to collaborate across product, architecture, and engineering teams.

• Design and develop APIs and microservices that support partner onboarding and BaaS integrations.
• Collaborate with product managers, architects, and engineering teams to define technical requirements and deliver scalable, reliable solutions.
• Promote engineering excellence through code reviews, mentoring, automated testing, CI/CD practices, and observability.
• Ensure applications meet established service-level agreements and contribute to monitoring and alerting capabilities.
• Participate in incident response, troubleshooting, and root cause analysis to improve system reliability.
• Create architecture and technical design documentation to support solution analysis and decision-making.
• Evaluate emerging technologies for applicability, feasibility, and potential adoption.
• Refactor and extend existing codebases to resolve defects and deliver new features.
• Build durable, flexible systems by prioritizing configurability over one-off customization.
• Support secure development practices and compliance requirements within a regulated financial services environment.

• 5+ years of professional software engineering experience.
• At least 1 year of experience serving in a technical leadership, lead engineering, or mentoring capacity.
• Demonstrated experience developing secure, standards-compliant applications across multiple platforms.
• Strong hands-on experience with C#, .NET, and SQL.
• Experience working with Microsoft Azure and Azure-native services, including:
  • Azure API Management
  • Azure SQL
  • Azure Cosmos DB
  • Azure Key Vault
• Experience with containerization technologies and distributed caching frameworks.
• Strong understanding of RESTful API design, OAuth 2.0, and OpenAPI specifications.
• Experience with event-driven and microservices-based architecture patterns.
• Familiarity with Azure Service Bus, Azure Event Hubs, or similar messaging technologies.
• Hands-on experience implementing and using observability platforms and dashboards, such as Datadog or Grafana.
• Advanced knowledge of Git, DevOps practices, Agile/Scrum methodologies, and CI/CD pipelines.
• Understanding of security and compliance standards relevant to financial services, including PCI DSS and SOC 2.
• Ability to work effectively in a fast-paced, iterative environment supporting mission-critical, revenue-generating, customer-facing applications.

• Previous experience within fintech, banking, payments, or embedded finance.
• Experience supporting Banking-as-a-Service platforms.
• Familiarity with partner onboarding workflows, third-party integrations, and SLA management.
• Experience with highly regulated, high-availability technology environments.
• Contributions to open-source projects, technical publications, or engineering communities.

#LI-SA1
#RTA
Russell Tobin offers eligible employee’s comprehensive healthcare coverage (medical, dental, and vision plans), supplemental coverage (accident insurance, critical illness insurance and hospital indemnity), 401(k)-retirement savings, life & disability insurance, an employee assistance program, legal support, auto, home insurance, pet insurance and employee discounts with preferred vendors.
Equal Employment Opportunity
Russell Tobin is an equal opportunity employer. We do not discriminate on the basis of the race, religious creed, color, national origin, ancestry, physical disability, mental disability, reproductive health decision making, medical condition, genetic information, marital status, sex, gender, gender identity, gender expression, age, sexual orientation, veteran or military status, or any other characteristic protected by applicable federal, state, or local law.
Fair Chance Employment
Russell Tobin is a Fair Chance employer. We consider all qualified applicants, including those with criminal histories, in a manner consistent with applicable state and local Fair Chance laws and ordinances, including, the California Fair Chance Act and all applicable local Fair Chance ordinances.
Accommodations
We are committed to providing reasonable accommodations to applicants and employees with disabilities. If you require a reasonable accommodation to participate in the application or interview process, or to perform the essential functions of this role, please contact us. 
Only applicable for San Francisco Candidates: Under the San Francisco Lactation in the Workplace Ordinance, we will provide written notice of lactation accommodation rights, and this notice will automatically be given upon hiring, any inquiry of parental leave or lactation accommodation.