Sr Software 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 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 ABOUT THIS ROLE Apex Fintech Solutions is seeking an experienced Senior Software Engineer to develop backend systems and scalable Market Data 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.. Duties/Responsibilities: 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 AlloyDB, Google Pub/Sub, GCS, and BigQuery, 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, RabbitMQ, Redis, and AlloyDb/PostgreSQL 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 domain. Education and/or Experience: BA, BS, MS, or PhD in Computer Science, Engineering, or a related technology field (or equivalent work experience) required. 5+ years of professional experience in backend software development, with proven experience in designing, implementing, and maintaining distributed systems and microservices. Demonstrated experience in leading projects, collaborating across functions, and mentoring junior engineers, with a commitment to contributing to a collaborative team culture. Certifications in Java, Kubernetes, or cloud platforms (e.g., Google Cloud) preferred. Required Skills/Abilities: Proficiency in building APIs to deliver secure, fault-tolerant access to real-time market data. Expertise in backend performance tuning and ensuring system scalability and reliability. Familiarity with financial systems, market data services, and real-time processing solutions. Experience leveraging GCP tools and services, such as AlloyDB, GCS, BigQuery, Pub/Sub, Valkey, and workflow orchestration tools like Astronomer and Apache Airflow. Hands-on experience with DevOps practices such as CI/CD pipelines and deployment automation. Deep understanding of securing APIs and backend infrastructures in cloud environments. Work Environment: This role operates in a hybrid capacity, requiring on-site collaboration two days per week. Our Rewards We offer a robust package of employee perks and benefits, including a market-leading salary with an annual bonus, 28 days of annual leave plus 10 Northern Ireland national holidays, a training and development budget, and a pension matched up to 7%. Our benefits also cover private health insurance for medical, dental, and optical care, and life insurance. We emphasize work-life balance with flexible working hours, parental leave, a modern city center office, and a hybrid work schedule that allows for greater flexibility by partially working from home. Additional perks include monthly catered lunches, unlimited drinks and snacks, hackathon events, poker tournaments, and a charitable matching gift program. 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. ​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 a market-leading salary with an annual bonus, 28 days of annual leave plus 10 Northern Ireland national holidays, a training and development budget, and a pension matched up to 7%. Our benefits also cover private health insurance for medical, dental, and optical care, and life insurance. We emphasize work-life balance with flexible working hours, parental leave, a modern city center office, and a hybrid work schedule that allows for greater flexibility by partially working from home. Additional perks include monthly catered lunches, unlimited drinks and snacks, hackathon events, poker tournaments, and a charitable matching gift program. 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.