Senior .NET Developer

Axos Business Center, Corp

About This Job

We are seeking a highly experienced Senior Backend .NET API Developer with strong expertise in financial services platforms to design, build, and optimize secure, scalable backend systems. The ideal candidate will have deep experience in .NET Core / ASP.NET APIs, microservices architecture, and high-volume transactional systems, with a strong understanding of banking/financial domain requirements such as security, compliance, and real-time processing.
This role goes beyond development — the candidate is expected to actively participate in production incident (ITN) calls, take ownership of issue resolution, and drive root cause fixes to ensure system stability, uptime, and customer impact mitigation.

Key Responsibilities

Production Support & Incident Management (Critical Responsibility)

• Actively participate in ITN / production incident bridge calls and provide real-time technical troubleshooting
• Take end-to-end ownership of production issues impacting APIs and backend services
• Perform rapid debugging, issue isolation, and hotfix implementation during incidents
• Drive root cause analysis (RCA) and implement permanent fixes to prevent recurrence
• Collaborate with cross-functional teams (QA, DevOps, Infra) to restore service within SLA timelines
• Monitor logs, metrics, and tracing tools to quickly identify production failures
• Ensure post-incident documentation, learnings, and preventive measures are implemented

Backend & API Development

• Design, develop, and maintain RESTful APIs and microservices using .NET Core / ASP.NET Core 
• Build scalable backend services supporting high-volume transactions and financial workflows
• Implement robust business logic for payments, accounts, transactions, and integrations

Architecture & System Design

• Lead backend architecture design focusing on scalability, security, and performance
• Define API contracts, service interfaces, and data models
• Design distributed systems, event-driven or microservices architectures

Financial Domain & Compliance

• Ensure systems comply with financial regulations, security standards, and audit requirements
• Implement secure transaction processing and data protection strategies
• Work with domain teams on risk, reporting, settlement, or payment systems

Database & Data Management

• Design and optimize relational and NoSQL databases (SQL Server, PostgreSQL, MongoDB)
• Ensure data integrity, consistency, and performance tuning

Integration & Collaboration

• Integrate with external systems (e.g., payment gateways, banking APIs, third-party services)
• Collaborate with architects, product teams, QA, and DevOps teams

Code Quality & Leadership

• Conduct code reviews, mentoring, and enforce best practices
• Drive technical design discussions and solution architecture
• Participate in Agile/Scrum processes

Performance & Operations

• Optimize systems for low latency, high availability, and reliability
• Troubleshoot production issues and perform root-cause analysis

Required Qualifications

Experience

• 8–12+ years of experience in backend development
• Strong experience in financial services / banking / fintech domain (mandatory)
• Proven experience building enterprise-grade applications and APIs

Technical Skills

• Strong proficiency in C#, .NET Core / .NET 8+ / ASP.NET Core
• Hands-on experience with REST APIs, Web APIs, and microservices
• Solid knowledge of SQL Server and database design
• Experience with Entity Framework / ORM tools
• Understanding of distributed systems, event-driven architecture

Architecture & Cloud

• Experience with cloud platforms (Azure/AWS/GCP)
• Familiarity with Docker, Kubernetes, CI/CD pipelines
• Knowledge of system design and scalability patterns

Security & Compliance

• Strong understanding of:
  • API security (OAuth2, JWT, OIDC)
  • Data encryption and protection
  • Financial compliance standards (PCI, SOX, etc.)

Other Skills

• Strong analytical, problem-solving, and debugging skills
• Excellent communication and stakeholder management
• Experience mentoring and leading engineers

Preferred Qualifications

• Experience with low-latency trading or real-time systems [builtin.com]
• Knowledge of payment systems (ACH, RTP, cards, SWIFT, etc.)
• Experience with event streaming (Kafka, RabbitMQ)
• Exposure to Domain-Driven Design (DDD)

Education

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field

What Success Looks Like

• Delivering secure, scalable APIs powering financial transactions
• Maintaining high system uptime and performance under load
• Driving architecture modernization and microservices adoption
• Enabling compliant and reliable financial integrations

Nice-to-Have (Based on Your Context – Optional Add-on)

If you plan to tailor this for core banking / enterprise services (like your environment at Axos), you can explicitly add:

• Experience with identity platforms, payments systems, or core banking integrations
• Familiarity with event-driven enterprise platforms (Redis, RabbitMQ)
• Exposure to API gateways (Apigee).

About Axos

Born digital-first, Axos delivers financial tools and services that allow individuals, small businesses, and companies to access and manage their money how, when, and where they want. We’re a diverse team of dynamic, insightful, and independent innovators who are excited to provide technology-driven solutions that offer unbeatable value to our customers.

Axos Financial is our holding company and is publicly traded on the New York Stock Exchange under the symbol "AX" (NYSE: AX).

Learn More about working at Axos Business Center

Pre-Employment Background Check, Medical, and Drug Test:

All offers are contingent upon the candidate successfully passing a credit check, criminal background check, and pre-employment medical and drug screening. 

Equal Employment Opportunity:

Axos is an Equal Opportunity employer. We are committed to providing equal employment opportunities to all employees and applicants without regard to race, religious creed, color, sex (including pregnancy, breast feeding and related medical conditions), gender, gender identity, gender expression, sexual orientation, national origin, ancestry, citizenship status, military and veteran status, marital status, age, protected medical condition, genetic information, physical disability, mental disability, or any other protected status in accordance with all applicable federal, state, and local laws.

Job Functions and Work Environment:

While performing the duties of this position, the employee is required to sit for extended periods of time. Manual dexterity and coordination are required while operating standard office equipment such as computer keyboard and mouse, calculator, telephone, copiers, etc.

The work environment characteristics described here are representative of those an employee may encounter while performing the essential functions of this position. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions of this position.