Senior Backend Engineer – AI Platform & Agentic AI

WEX; United States; Remote; USD 122,000 - 146,000; Full time

Job summary

WEX is seeking a seasoned Sr. Software Engineer in the North America Mobility organization. This role sits in the Platform team, building an AI Platform to support feature development and the realization of autonomous AI agents across fintech workloads.

You will design, develop, and deploy scalable backend services, implement REST and gRPC APIs, lead design decisions, mentor engineers, and ensure reliability while collaborating with product, design, and other teams.

Qualifications

• Bachelor’s degree in Computer Science or Software Engineering.
• 5–8 years of professional software engineering experience.
• Strong data structures, algorithms, and OO design.
• Experience designing internet-scale services with reliability and security.
• Proficiency in Java or C#, SpringBoot, RESTful APIs, and SQL.

Responsibilities

• Design, develop, and maintain robust backend services.
• Develop public REST APIs and gRPC interfaces.
• Lead design decisions and collaborate with engineers.
• Write unit, integration, and performance tests.
• Analyze bottlenecks and implement scalability improvements.
• Provide live-site support and incident response.
• Mentor junior engineers and promote best practices.

Skills

Java

C#

SpringBoot

RESTful APIs

SQL

OO Design

Distributed Systems

Education

Bachelor’s degree in Computer Science or Software Engineering

Master’s degree in Computer Science or Software Engineering

Tools

Docker

Kubernetes

Kafka

Job description

WEX is seeking a seasoned Sr. Software Engineer in the North America Mobility organization. This role sits in the Platform team, building an AI Platform to support feature development and the realization of autonomous AI agents across fintech workloads.

You will design, develop, and deploy scalable backend services, implement REST and gRPC APIs, lead design decisions, mentor engineers, and ensure reliability while collaborating with product, design, and other teams.