Sr Data Engineer

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 Built In

Wealth Tech of the Year
2025
Presented by US Fin Tech Awards

The World's Top 250 Fintech Companies
2024
Presented by CNBC

Apex Fintech Solutions is seeking a Senior Data Engineer to play a key role on our Billing engineering team, responsible for designing, developing, and maintaining high-quality software solutions. You will leverage your experience and expertise to contribute to the software development lifecycle, from requirements analysis and implementation to testing and deployment. You will collaborate with team members and cross-functional partners to deliver scalable, reliable, and efficient software products that meet the needs of our users and business objectives.

• Design and maintain data pipelines for the classic billing system using Python and MS SQL Server, including ETL processes, data transformations, stored procedures, and scheduled jobs to support financial reporting and reconciliation workflows

• Build and optimize SQL queries and database objects in MS SQL Server for the legacy system, writing complex queries, views, indexes, and stored procedures to support billing operations, reporting requirements, and data quality checks

• Develop Python-based automation and data processing scripts to integrate the classic system with modern platforms, handling data extraction, transformation, validation, and loading between MS SQL Server and cloud-based systems like Big Query and PostgreSQL

• Support data migration and modernization efforts from the classic billing system to the new microservices platform, designing data mapping strategies, building migration tools, and ensuring data integrity across systems during the transition

• Create and maintain data quality monitoring, implementing validation checks, reconciliation processes, and alerting mechanisms to ensure accuracy and consistency of billing data across both classic and modern systems

• Collaborate with engineering and finance teams to understand data requirements, provide data insights for billing calculations and settlements, and support ad-hoc analysis and reporting needs using SQL, Python, and BI tools

• Document data schemas, pipelines, and processes for both classic and modern systems, creating technical documentation, data dictionaries, and runbooks to support system knowledge transfer and operational continuity

• Bachelor's degree in Computer Science, Engineering, or related field (or equivalent work experience) required; advanced degree preferred

• 5+ years of experience in software development with a strong proficiency in one or more programming languages, including Java, Python

• Experience with automated testing frameworks and methodologies for backend services

• Experience contributing to…