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Software Engineering Intern (Cash)

Austin, Texas, United States of America

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WHO WE ARE

Apex Fintech Solutions (Apex) powers innovation and the future of digital wealth management by building tech-forward solutions that help simplify, automate, and facilitate access to financial markets for all. Our robust suite of fintech software enables us to support clients such as Stash, Betterment, SoFi, Webull, and eToro, amongst many others; collectively, Apex powers access to the stock market for over 22+ million end customers.  

At Apex, we are changing how the securities industry operates by reinventing the status quo, which was manual, slow, and accessible only by the ultra-wealthy. We're digitizing and democratizing systems so that everyone has an opportunity to invest. 

When you're at Apex, you drive this change. You're part of a global team with a clear vision: to be the trusted technology that powers the digital economy. Our offices in Austin, Dallas, Chicago, New York, Portland, Belfast, and Manila are home to over 1,000 employees. 

Together, we’re shaping the future of financial innovation. Embrace change. Solve big. Win together. And be G.R.E.A.T. — grit, results, empathy, accountability, and teamwork — with Apex. 

We’re proud to be recognized for the innovative work we do, the purpose-driven nature of our work, and the collaborative culture we’ve created. Here are just a few of the many awards we’ve recently received: 

Best Places to Work 

2026, 2025, 2024, 2023 - Presented by BuiltIn 

WealthTech of the Year 

2025 - Presented by US FinTech Awards 

The World’s Top 250 Fintech Companies 

2024 - Presented by CNBC 

ABOUT THIS ROLE

Apex Fintech Solutions is looking for a Software Engineering Intern with unbounded potential for a development team on the front lines of Apex's high-volume, high-availability trade clearing suite. We partner with some of the industry's hottest next-generation stock trading products. You'll be at the center of rapidly scaling services that will test your limits.

Apex engineering teams are charged with building the services our clients love and are at the heart of our future product innovations. Apex has begun its transformation from on-premise infrastructure to the Cloud (GCP & AWS), and our team is responsible for transforming our products into the next generation clearing platform that will lead our industry for years to come. We are in need of smart, developers to build out our cloud-native (GCP/AWS), event-driven (Apache Kafka), Microservices framework.

Have you been waiting on the opportunity to gain hands-on experience in the fintech industry? Now's your chance.

What you will do:

• Assist in the development, testing, and maintenance of cash management applications including ACH transfers, wire processing, and cash journal systems
• Collaborate with the Cash engineering team to design new features for money movement platforms and cash settlement workflows
• Participate in code reviews and provide constructive feedback to peers working on financial services infrastructure
• Help troubleshoot, debug, and resolve software defects in cash transfer systems and payment processing pipelines
• Contribute to documentation of cash management processes, API specifications, and system architecture
• Work with modern technologies including Java and Python in a Bazel-managed monorepo environment
• Assist with testing and validation of financial transactions to ensure accuracy and compliance
• Stay updated with emerging technologies and industry best practices in fintech and payment systems

What You'll Learn

• Financial services software development and cash management systems

• Payment processing workflows including ACH, wires, and instant transfers

• Working with high-scale, mission-critical financial infrastructure

• Modern development practices in a multi-language monorepo environment

• Regulatory compliance and security best practices in financial technology

What you can expect:

• A highly collaborative environment where everyone is focused on outcomes that build momentum for Apex to reach its goals.
• A culture that values a test-centric approach to software development where 100% unit test coverage is the expectation.
• End-to-end ownership of what you deploy. From documentation to service-level objectives, your team is ultimately responsible for the health of your products.
• Contribute to and benefit from a culture of continuous learning.
• Access to mentors, generous policies regarding attending industry conferences and book reimbursement, regular lunch and learns.
• Quarterly 2-day hackathons.
• An environment committed to using the right tool to get the job done.
• Work that matters.

The skills you'll need to succeed:

• Currently pursuing or recently completed a degree in Computer Science, Software Engineering, or a related STEM field.
• Senior standing, May 2026 graduate
• Strong analytical and problem-solving skills.
• Currently pursuing a degree in Computer Science, Software Engineering, or related field
• Strong programming fundamentals in one or more languages (Go, Java, Python preferred)
• Interest in financial technology and payment systems
• Detail-oriented approach suitable for working with financial data
• Collaborative mindset and eagerness to learn in a fast-paced environment

Preferred skills:

• Have a real passion for software engineering, as demonstrated by previous internships, work experience, projects, or publications
• Either previous knowledge in financial markets or a strong interest in learning

enginering #intern #LI-DNI

​Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties, or responsibilities required of the employee for this job. Duties, responsibilities, and activities may change at any time with or without notice.

Our Rewards

We offer a robust package of employee perks and benefits, including healthcare benefits (medical, dental and vision, EAP), competitive PTO, 401k match, parental leave, and HSA contribution match. We also provide our employees with a paid subscription to the Calm app and offer generous external learning and tuition reimbursement benefits. At AFS, we offer a hybrid work schedule for most roles that allows employees to have the flexibility of working from home and one of our primary offices.

EEO Statement

Apex Fintech Solutions is an equal opportunity employer that does not discriminate on the basis of race, color, religion, sex (including pregnancy, sexual orientation, and gender identity), national origin, age, disability, veteran status, marital status, or any other protected characteristic. Our hiring practices ensure that all qualified applicants receive fair consideration without regard to these characteristics.

Disability Statement

Apex Fintech Solutions is committed to creating an inclusive and accessible workplace for all candidates, including those with disabilities. We are dedicated to ensuring equal employment opportunities and providing reasonable accommodations to qualified individuals with disabilities. If you require reasonable accommodations to participate in the application or interview process, please submit your request via the Candidate Accommodation Requests Form. We will work with you to provide the necessary accommodations to ensure your full participation in our hiring process.

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