Sr Software Engineer

Overview

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 fintech software supports clients such as Stash, Betterment, SoFi, Webull, eToro, and more; 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 and digitizing systems so everyone has an opportunity to invest.

We are a global team with offices in Austin, Dallas, Chicago, New York, Portland, Belfast, and Manila, home to over 1,000 employees. Together, we’re shaping the future of financial innovation. Be bold, solve big, win together, and embody G.R.E.A.T. — grit, results, empathy, accountability, and teamwork — with Apex.

We’re proud to be recognized for our innovative work and collaborative culture. Here are some of the awards we have 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 an experienced Senior Software Engineer to develop backend systems and scalable Market Data real-time APIs that drive critical domains such as Risk Engine, End Investor platforms, Wealth Management tools, Portfolio Rebalancing, and UIs. This role focuses on designing and delivering reliable APIs to enable real-time market data access for both internal systems and client-facing platforms.

You will thrive in a fast-paced environment, leveraging cloud-native technologies to build high-performance and scalable solutions that handle diverse asset classes—including Equities, Fixed Income, Mutual Funds, and Options—across key data categories such as Pricing and Fundamentals.

This is a unique opportunity to shape the future of market data solutions through impactful API development, creative problem-solving, and collaboration with cross-functional teams.

• Backend Development:
  Design, develop, deploy, and maintain high-performance backend systems using Java to power market data APIs supporting client-facing UIs and internal systems.
• Microservices Engineering:
  Build and manage containerized microservices using Kubernetes and Docker, ensuring scalability, reliability, and performance for market data services.
• Cloud-Native Applications:
  Develop and optimize infrastructure leveraging Google Cloud Platform (GCP) and associated technologies, including Alloy
  
  DB, Google Pub/Sub, GCS, and Big Query, to ensure efficient processing and storage of market data.
• Workflow Automation:
  Utilize tools like Astronomer and Apache Airflow for orchestration and automation of workflows within the Market Data ecosystem.
• Distributed Systems:
  Design and implement scalable, event-driven systems employing Kafka, Rabbit
  
  MQ, Redis, and Alloy Db / Postgre
  
  SQL to ensure efficient data delivery and processing for diverse scenarios.
• API Development:
  Design robust, secure, and efficient gRPC and REST APIs to enable real-time access to market data for key business domains (e.g., Risk Engine, End Investor platforms, Wealth tools, and Ascend UIs).
• Market Data Processing:
  Build systems for real-time delivery of market data across asset classes such as Equities, Fixed Income, Mutual Funds, and Options, ensuring efficient handling of data categories (e.g., Pricing and Fundamentals).
• Performance Optimization:
  Solve complex technical problems, optimizing system performance, scalability, reliability, and data latency.
• Collaboration & Communication:
  Work closely with globally distributed teams to align architecture strategies and translate technical requirements for non-technical stakeholders.
• Mentorship and Knowledge Sharing:
  Support junior engineers through mentoring, technical guidance, and promoting best practices to enhance team expertise.
• System Design & Architecture:
  Drive key architectural decisions for scalable, secure, and well-integrated solutions that meet the specific needs of the Market Data…