Sr. Software Engineer

LaSalle Network; Oak Brook (IL); Hybrid; USD 140,000 - 150,000; Full time

Benefits offered by this job

Comprehensive benefits package

Bonus eligibility ~5%

Hybrid onsite work model

Job summary

LaSalle Network is seeking a Senior Software Engineer in Oak Brook, IL to design, develop, and enhance backend systems for mission-critical transaction and trading environments. You will build scalable Java services, REST and gRPC APIs, and work across the full SDLC in a fast-paced fintech setting.

The role emphasizes solving complex technical problems, improving performance, and contributing to high-availability platforms with a hybrid onsite work model.

Qualifications

• 8+ years of software engineering experience.
• Experience building backend APIs and distributed systems.
• Strong problem-solving and communication skills.
• Ability to operate in business-critical environments.

Responsibilities

• Design and develop backend services using Java.
• Build and maintain REST and gRPC APIs.
• Support high-performance transaction-processing systems.
• Collaborate with product managers and engineering teams to design scalable solutions.
• Contribute across the full software development lifecycle.
• Participate in architecture, design, testing, deployment, and maintenance efforts.
• Improve reliability, scalability, and performance of existing systems.
• Support integration and data-processing workflows.

Skills

Java backend

Distributed systems

API design

Problem solving

Communication

Job description

A growing financial technology organization is seeking a Senior Software Engineer to join a team responsible for mission-critical transaction and trading systems.

This role will focus on designing, developing, and enhancing highly available software platforms that support complex business processes in a fast-paced financial environment.

The ideal candidate is a proven engineer who enjoys solving difficult technical problems, building scalable systems, and supporting business-critical applications.

Responsibilities

• Design and develop backend services using Java
• Build and maintain REST and gRPC APIs
• Support high-performance transaction-processing systems
• Collaborate with product managers and engineering teams to design scalable solutions
• Contribute across the full software development lifecycle
• Participate in architecture, design, testing, deployment, and maintenance efforts
• Improve reliability, scalability, and performance of existing systems
• Support integration and data-processing workflows

Required Qualifications

• 8+ years of software engineering experience
• Experience building backend APIs and distributed systems
• Strong problem-solving and communication skills
• Ability to operate in business-critical environments

Preferred Qualifications

• Financial services or fintech experience
• Trading platform experience
• Order management systems
• TypeScript
• Experience supporting transaction-intensive applications
• Base Salary: $140,000 - 150,000 annually
• Bonus: Eligible to earn a ~5% bonus
• Benefits: Comprehensive benefits package including medical, dental, and vision coverage
• Hybrid onsite model (4 days per week in office)
• Collaborative engineering culture
• High-impact business-critical technology environment