Software Engineer II; Cost Tax

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:

2026, 2025, 2024, 2023
- Presented by Built In

2025
- Presented by US Fin Tech Awards

2024
- Presented by CNBC

Apex is seeking a talented Software Engineer II to join our industry-leading Cost Basis and Tax technology team. You'll be working on mission-critical systems that process billions of transactions and generate millions of tax forms annually for major broker-dealers across the financial services industry. Our platform is recognized as the industry standard for robustness, scalability, performance, and accuracy. As a Software Engineer II, you will contribute to the development and enhancement of our Cost Basis and Tax calculation systems.

You'll work with complex financial data, implementing solutions that handle tremendous data volumes while maintaining the highest levels of accuracy required for regulatory compliance. This role offers the opportunity to work on some of the most technically challenging problems in financial technology.

• Design, develop, and maintain features for our Cost Basis and Tax calculation systems using Java and Jakarta EE standards
• Implement complex business logic for cost basis and tax processing
• Work with large-scale data processing systems handling billions of transactions
• Collaborate with cross-functional teams including Operations and Business teams to understand and implement requirements for new data scenarios
• Optimize application performance and scalability to handle significant data explosion inherent in cost basis and tax calculations
• Participate in code reviews and contribute to technical documentation
• Support production issues and participate in on-call rotation as needed
• Contribute to our cloud agnostic initiatives (AWS and GCP)

• Bachelor's degree in Computer Science, Software Engineering, or related field (or equivalent work experience) required
• 3+ years of software development experience
• Experience with JPA/Hibernate for database persistence
• Experience with relational databases (Postgre
  
  SQL preferred)

• Strong proficiency in Java development with Jakarta EE (formerly Java EE) standards
• Familiarity with enterprise messaging systems (JMS)
• Understanding of JDBC and database performance optimization
• Strong problem-solving skills and attention to detail
• Excellent communication skills and ability to work in a collaborative environment

• Experience with Wild Fly application server
• Knowledge of Query
  
  DSL or similar database abstraction layers
• Experience with Apache MQ or similar message brokers
• Familiarity with financial services, particularly cost basis or tax calculations
• Experience with cloud platforms (AWS or GCP)
• Experience with high-volume data…