We're on a mission to transform how organizations manage workforce spending. For over a decade, PEX has built and evolved solutions that help small and medium-sized organizations manage payments-related activities more efficiently, nimbly, and competitively. Our platform serves tens of thousands of businesses and millions of cardholders, including municipalities, nonprofits, and humanitarian organizations. We are building the future of business expense management with advanced card controls, real-time visibility, and seamless reconciliation. We work each day to find new ways we can help our community of customers operate more efficiently.

You are a Senior Software Engineer who thrives at the intersection of Fintech and AI innovation. You’ll join at an exciting time—this isn’t a role where you’ll be handed tickets and told what to build. You are a customer-focused engineer with an ownership mentality and the ability to act independently to lead features through all stages of our SDLC. You are comfortable using AI to accelerate your own productivity and have a demonstrated ability to learn new AI frameworks, workflows, and tools. You thrive in environments where you collaborate from ideation through deployment and ship code that impacts hundreds of thousands of users.

Key Responsibilities

• Experience: 5+ years of full-stack development experience, ideally within a B2B SaaS or Fintech environment.

• AI Expertise: Experience integrating customer-facing AI or agentic workflows into production environments.

• Security: Demonstrated knowledge of security frameworks and best practices (OWASP).

• Communication / Customer Focus: Eager to work directly with customers from feature inception to support.

NICE TO HAVE:

• Experience in a high-growth environment scaling platforms for millions of users.

• Proficient with the latest versions of .NET, C#, and Angular.

• Mastery of working with data in platforms like SQL Server, MongoDB, and Redis.
• Comfortable working in cloud platforms such as Azure and AWS.

• Familiarity with messaging systems like RabbitMQ or Azure Service Bus.

Skills, Knowledge and Expertise

• Experience: 5+ years of full-stack development experience, ideally within a B2B SaaS or Fintech environment.

• AI Expertise: Experience integrating customer-facing AI or agentic workflows into production environments.

• Security: Demonstrated knowledge of security frameworks and best practices (OWASP).

• Communication / Customer Focus: Eager to work directly with customers from feature inception to support.

Benefits

• Our People: Join an ego-free team of high-performers who value transparency, collaboration, and constant improvement.

• Health: 80% Company-Subsidized Medical, Dental, & Vision.

• Time Off: Flexible PTO + Federal Reserve Bank Holiday Schedule.

• Finance: 401(k) with 3% Match.

• Wellness: ClassPass Credits & Gym Membership Subsidies.

• Growth: Sponsored Learning & Development Opportunities.

• Location: 100% Remote-First Culture.

5+ years of full-stack development in B2B SaaS/Fintech; AI integration experience; security practices (OWASP); strong customer-focused collaboration.

Key Responsibilities

• Lead features
• Collaborate ideation
• Ship code

Skills & Tools

.NET, C#, Angular, SQL Server, MongoDB, Redis, Azure, AWS, RabbitMQ, Azure Service Bus

Job Details

• Category: Software Development
• Seniority: Senior Level
• Commitment: Full Time
• Workplace: Remote — New York, New York, United States
• Salary: USD 150,000 – 175,000 / year
• Languages: English

Benefits

• 401k matching

About PEX

A fintech company focused on helping organizations manage workforce spending with card controls and real-time visibility. — Industry: Information Technology