[Skip to main content](#main-content) [OpenNash Jobs](https://jobs.opennash.com/) [Hiring report](/reports/hiring/) · [All Interactive Brokers Group jobs](https://jobs.opennash.com/companies/interactive-brokers-group/) · [Search jobs](/search/) Interactive Brokers Group · Greenwich, CT # Senior Software Developer - Client Tax Greenwich, CT, US Hybrid Senior individual contributor Software Engineering Listed on Interactive Brokers Group’s official careers site. Posted June 30, 2026. Check that it is still open and apply there. [Apply on Interactive Brokers Group’s careers site →](https://jobs.dayforcehcm.com/en-US/ibgllc/CANDIDATEPORTAL/jobs/959) [OpenNash Jobs](https://jobs.opennash.com/) / [Interactive Brokers Group](https://jobs.opennash.com/companies/interactive-brokers-group/) / Senior Software Developer - Client Tax ## Job description This is Hybrid role (3 days in office / 2 day remote) About Your Team You will be joining the Client Tax (TaxCust) group within the broader Client Tax Team. While the Client Tax Team covers a wide range of tax-related functions, TaxCust is specifically focused on the development and maintenance of the systems that power our client-facing tax operations. Our core responsibilities include: - Maintaining and continuously improving the enterprise brokerage tax form collection and reporting system - Maintaining and improving the Oracle data models and XML schemas that underpin our tax data architecture - Maintaining and improving the Java-based processing and reporting programs that drive our tax workflows - We are a technically focused team operating at the intersection of financial services and enterprise software engineering, building and evolving mission-critical systems that serve clients at scale. Your Role As a new member of TaxCust, you will take on meaningful technical ownership from day one. Over your first two years, your responsibilities will include: - Maintaining and improving the enterprise brokerage tax form collection and reporting system - Maintaining and improving related Oracle data models and XML schemas - Maintaining and improving processing and reporting Java programs - Extracting technical requirements from business specifications for the tax form collection and reporting system - Planning and implementing end-to-end system improvements across the full technology stack - Analyzing and resolving production incidents, ensuring system stability and reliability - Analyzing resource usage and scalability bottlenecks and implementing targeted improvements - Planning and implementing a transition from a bulk processing model to an event-based processing architecture - This is a highly impactful role where your contributions will directly shape the reliability, scalability, and evolution of a core enterprise platform. ### Must-Have Skills - Strong database knowledge and experience, including data modeling and design - Experience working with large-scale data repositories - Strong object-oriented software development skills, with hands-on experience in Java, Spring, and REST APIs - Demonstrated ability to extract technical specifications from business requirements - Proven ability to plan, implement, and lead complex software projects from inception to delivery - Detail-oriented and quality-focused mindset with a commitment to engineering excellence ### Nice-to-Have Skills - Familiarity with US and international tax regulations and reporting requirements - Knowledge of or experience with IRS tax forms (W-8, W-9) and IRS tax reporting (1099) - Knowledge of or experience with CRS (Common Reporting Standard) tax reporting ### Company Benefits & Perks - Competitive salary, annual performance-based bonus and stock grant - Retirement plan 401(k) with competitive company match - Excellent health and wellness benefits, including medical, dental, and vision benefits. Company paid medical healthcare premium. - Wellness screenings and assessments, health coaches and counseling services through an Employee Assistance Program (EAP) - Daily company lunch allowance provided and a fully stocked kitchen with healthy options for breakfast and snacks - Corporate events including team outings, dinners, volunteer activities and company sports teams - Education reimbursement and learning opportunities ## At a glance - Posted by the employer: Jun 30, 2026 - First seen by OpenNash: Jul 10, 2026 - Last checked: Oct 17, 2026 - Listed for: 109 days - Location: Greenwich, CT, US - Work arrangement: Hybrid[Apply on Interactive Brokers Group’s careers site →](https://jobs.dayforcehcm.com/en-US/ibgllc/CANDIDATEPORTAL/jobs/959) ## More jobs at Interactive Brokers Group ### [Java Web Application Developer](https://jobs.opennash.com/companies/interactive-brokers-group/jobs/3c686cd2d6b52b15efe2/) Greenwich, CT, US ### [Senior Frontend Developer](https://jobs.opennash.com/companies/interactive-brokers-group/jobs/a902893454db18007774/) Greenwich, CT, US ### [Senior Java Developer](https://jobs.opennash.com/companies/interactive-brokers-group/jobs/36470cfa2cae82886ecb/) Greenwich, CT, US ### [Senior Software Developer - Python](https://jobs.opennash.com/companies/interactive-brokers-group/jobs/a33fa82237b3f4c9dda4/) Greenwich, CT, US ### [Software Developer Summer Internship 2027](https://jobs.opennash.com/companies/interactive-brokers-group/jobs/b41f63e51e68c2b0270d/) Greenwich, CT, US ## Similar jobs at other companies ### [Client Tax Senior Associate](https://jobs.opennash.com/companies/jpmorganchase/jobs/19bc5ee84077d227e7c9/) JPMorganChase · Newark, DE, United States ### [Mainframe Engineer/Developer - Client Site](https://jobs.opennash.com/companies/ntt/jobs/4473a1accbaf68448fda/) NTT · Plano, TX, US, United States ### [Software Developer/Software Engineer in Test](https://jobs.opennash.com/companies/general-dynamics/jobs/229bce1af89aceaed99c/) General Dynamics · Falls Church, VA, US ### [Kubernetes Software Developer](https://jobs.opennash.com/companies/lockheed-martin/jobs/0950b79a7365c62d6b5b/) Lockheed Martin · Manassas, VA ### [Senior Software Developer](https://jobs.opennash.com/companies/huntington-bank/jobs/1af3c52e38c5eca56557/) Huntington Bank · Columbus, OH [Jobs in Greenwich, CT](/locations/us/ct/greenwich/)[Jobs in Connecticut](/locations/us-ct/)[Software Engineering jobs](/functions/software-engineering/) OpenNash lists jobs from employers’ own careers sites and does not handle applications. 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