Block is one company built from many blocks, all united by the same purpose of economic empowerment. The blocks that form our foundational teams - People, Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more - provide support and guidance at the corporate level. They work across business groups and around the globe, spanning time zones and disciplines to develop inclusive People policies, forecast finances, give legal counsel, safeguard systems, nurture new initiatives, and more. Every challenge creates possibilities, and we need different perspectives to see them all. Bring yours to Block. The Role Ledgering is the accounting core that other teams at Block build on. We keep the authoritative records of balances for Square and Cash App, along with the transactions and settlement that move that money. As a Senior Software Engineer on the team, you will build and operate the systems of record for balances and transactions, the settlement orchestration that decides how sellers and customers get paid, and the automated treasury systems that position Block's own cash. At Block's transaction volume, this work has direct, measurable impact on financial accuracy and on the trust merchants and customers place in us. You Will - Design, build, and operate the balance and transaction systems of record that serve as the financial source of truth for millions of merchants and customers. - Build settlement orchestration that determines how account holders get paid: schedules, amounts, deposit methods, and withholdings. - Develop self-serve ledgering APIs with durable semantics and clear contracts, so partner teams can stand up a new balance or transaction type in about a day instead of waiting weeks on custom integration work. - Emit balance and settlement data that downstream finance, reconciliation, and reporting teams can trust, against agreed data contracts. - Design and implement reliable, high-volume distributed transaction-processing systems, making thoughtful tradeoffs between consistency and availability when both are not possible. - Drive convergence across a large portfolio of financial services: consistent transaction and balance models, shared workflow tooling, and predictable integration patterns. - Operate tier-0 and tier-1 financial systems against published SLOs, and debug production issues across services and multiple levels of the stack in a high-reliability environment. - Work AI-natively: use AI agents throughout the development lifecycle, and build agents and automation that reduce operational toil across our services. - Lead complex projects end to end, breaking the work into components and milestones that other engineers can pick up. - Mentor other engineers and contribute to the technical direction of the team. - Work with engineers, product managers, and finance and treasury stakeholders across the company to ship new capabilities at scale. You Have - A minimum of 8 years of related experience with a Bachelor's degree; or 6 years and a Master's degree; or a PhD with 3 years experience; or equivalent experience. - Experience designing and operating distributed, high-throughput, fault-tolerant services, with a strong understanding of consistency, idempotency, and failure handling. - Experience building money-movement systems such as ledgers, double-entry accounting, settlement, or treasury, or the curiosity and drive to build deep expertise in the domain. - Proficiency in at least one major programming language (for example Java, Kotlin, or Go) and strong SQL. - Experience leading complex, ambiguous projects across multiple engineering teams and driving clear next steps in areas without clear ownership. - High standards for software architecture and engineering practices, including maintainable and testable code, CI/CD, and observability, in a complex, high-stakes financial environment. - Proficiency in using AI tools throughout the software development lifecycle to improve engineering productivity, problem solving, and software delivery. - Strong written and verbal communication skills. Technologies We Use and Teach - Java, Kotlin, Python - AI agents and tooling across the development lifecycle, including AMP, Codex, Claude, Goose and MCP - Temporal, Protocol Buffers, jOOQ, GraphQL - MySQL, Aurora, Vitess, Databricks, Snowflake - AWS, Kubernetes, Terraform, Datadog We're working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and "fair chance" ordinances. We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we're doing to build a workplace that is fair and square? Check out our I+D page . While there is no specific deadline to apply for this role, U.S. roles are typically open for an average of 55 days before being filled by a successful candidate. Please refer to the date listed at the top of this job page for when this role was first posted. Block takes a market-based approach to pay, and pay may vary depending on your location. U.S. locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate's starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future. To find a location's zone designation, please refer to this resource . If a location of interest is not listed, please speak with a recruiter for additional information. Zone A: $217,800 - $326,800 USD Zone B: $207,000 - $310,400 USD Zone C: $196,100 - $294,100 USD Zone D: $185,200 - $277,800 USD Application Guidelines Candidates may submit up to 9 active applications within a 60-day period. Reapplications to the same role are accepted 90 days after a previous application has been reviewed. Use of AI in Our Hiring Process We may use automated AI tools to evaluate job applications for efficiency and consistency. These tools comply with local regulations, including bias audits, and we handle all personal data in accordance with state and local privacy laws. Contact us here with hiring practice or data usage questions. Every benefit we offer is designed with one goal: empowering you to do the best work of your career while building the life you want. Remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning are just some of our offering. Check out our other benefits at Block. Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people. Square makes commerce and financial services accessible to sellers. Cash App is the easy way to spend, send, and store money. Afterpay is transforming the way customers manage their spending over time. TIDAL is a music platform that empowers artists to thrive as entrepreneurs. Bitkey is a simple self-custody wallet built for bitcoin. Proto is a suite of bitcoin mining products and services. Together, we're helping build a financial system that is open to everyone.

• Uses SAS or other software to develop custom programming code to generate summary tables, data listings, graphs and derived datasets as specified in the statistical analysis plan and programming specifications. • Works to ensure that outputs meet quality standards and project requirements. • Performs validation programming and works with other Programmers, Biostatisticians, and other project team members to resolve discrepancies or any findings. • Keeps project team members informed of programming progress and issues requiring their attention. • Follow applicable SOPs, WIs, and relevant regulatory guidelines (e.g. ICH). • Maintains well organized, complete, and up-to-date project documentation, testing, and verification/quality control documents and programs ensuring inspection readiness. • Manages scheduling and time constraints across multiple projects at a time, sets goals based on priorities from management, and adapts to timeline or priority changes by reorganizing daily workload. • Develops specifications for datasets and outputs of any complexity according to statistical and sponsor requirements. • Anticipates and addresses potential programming issues, reflects forethought, establishes the basis for efficient programming and accurately defines all variables to be accepted by peer review and sponsor/requestor with little rework. • Prepares in advance for internal meetings, contributes ideas, and demonstrates respect for opinions of others. • Conducts effective internal meetings (appropriate in format, frequency and attendance). • Distributes relevant information in advance. Ensures minutes are promptly and accurately distributed. Follows action items through to completion, and maintains order and focus of meetings, working toward consensus. • Displays willingness to work with others and assist with projects and initiatives as necessary to meet the needs of the business. • Negotiates and establishes accurate time estimates for completion of study programming activities with internal team members and statistical programming management, and completes project programming activities within timeframe allotted. • Acts as the lead statistical programmer. Directs the programming activities of other programming personnel and monitors progress on programming deliverables. • Reviews project documentation such as Statistical Analysis Plan, mock shells, programming specifications, annotated CRFs, and SAS database design. • Provides feedback to the appropriate project team members which reflects forethought and reduces inefficiencies in programming activities. • Participates in sponsor meetings, kickoff meetings, and bid defense meetings as statistical programming representative, as required by sponsor. • Contributes to the mentoring of programming personnel through developing training courses, presenting training materials, reviewing work, and providing feedback or guiding new associates in process. • Transfers deliverables. • Performs other work-related duties as assigned.

• Uses SAS, or other software, to develop custom programming code to generate summary tables, data listings, graphs and derived datasets as specified in the statistical analysis plan and programming specifications. • Works to ensure that outputs meet quality standards and project requirements. • Performs validation programming and works with other programmers, biostatisticians, and other project team members to resolve discrepancies or any findings. • Keeps project team members informed of programming progress and issues requiring their attention. • Follow applicable SOPs, WIs, and relevant regulatory guidelines (e.g. ICH). • Maintains well organized, complete, and up-to-date project documentation, testing, and verification/quality control documents and programs ensuring inspection readiness. • Manages scheduling and time constraints across multiple projects at a time, sets goals based on priorities from management, and adapts to timeline or priority changes by reorganizing daily workload. • Develops specifications for datasets and outputs of any complexity according to statistical or sponsor requirements. • Anticipates and addresses potential programming issues, reflects forethought, establishes the basis for efficient programming and accurately defines all variables to be accepted by peer review and sponsor/requestor with little rework. • Conducts effective internal meetings (appropriate in format, frequency and attendance). • Distributes relevant information in advance. Ensures minutes are promptly and accurately distributed. Follows action items through to completion, and maintains order and focus of meetings, working toward consensus. • Displays willingness to work with others and assist with projects and initiatives as necessary to meet the needs of the business. • Accountable for on-time delivery across concurrent programming deliverables. • Negotiates programming timelines and provides risk mitigation plans for projects or programs, as needed. • Proactively informs management of the status of deliverables and significant project or program issues, including planned resolutions. • Acts as the lead statistical programmer. • Directs the programming activities of other programming personnel and monitors progress on programming deliverables. • Reviews project documentation such as Statistical Analysis Plan, mock shells, programming specifications, annotated CRFs, and SAS database design. • Provides feedback to the appropriate project team members which reflects forethought and reduces inefficiencies in programming activities. • Participates in sponsor meetings, kickoff meetings, and bid defense meetings as statistical programming representative, as required by sponsor. • Contributes to the mentoring of programming personnel through developing training courses, presenting training materials, reviewing work, and providing feedback or guiding new associates in process. • Maintains a good working knowledge of clinical drug development, industry standards, and electronic submission requirements; serves as a technical expert resource to other department members for complex programming questions. • Works cooperatively with other biostatistics and statistical programming personnel to establish standard operation procedures (SOPs), guidelines, policies, and/or procedures. • Contributes technical expertise to the development of programming tools and macros for standardization and efficiency. • When serving as a technical subject matter expert for CDISC and other industry and regulatory requirements, provides guidance and training to the Biostatistics group and other departments on the appropriate use of CDISC Standards. • When serving as a subject matter expert for CDISC and other industry and regulatory requirements, performs compliance reviews of project deliverables for CDISC deliverables including SDTM and ADaM specifications and datasets as well as any regulatory required documents. (i.e. DEFINE.XML) • When serving as a subject matter expert for CDISC and other industry and regulatory requirements, actively participates in industry standards organizations and provides regular updates to the Biometrics Department on upcoming changes to those standards. • Transfers deliverables. • Performs other work-related duties as assigned.

Role Description We are a passionate team of technologists building the firm’s next-generation fixed income trading platform. The role is primarily focused on C++ application development for Equities trading products. The work involves: - Developing and enhancing trading ticket functionality. - Implementing negotiation workflows with multiple dealers to achieve optimal trading outcomes. - Building robust post-trade processing capabilities for the supported products. The team collaborates extensively with several core engineering and business groups across the organization, including: - The Trading Systems Team - The Dealer Software Team - The FIX Connectivity Team - The Front-End Development Team responsible for building trading ticket interfaces using JavaScript. This is an exciting opportunity to contribute to high-impact trading technology while working alongside experienced engineers and domain experts in electronic trading. Tradeweb Technology jobs are fully remote, with the option to use the Jersey City office for team meetings and collaboration efforts. Qualifications - Bachelor’s degree in Computer Science or a related field. - 5+ years of professional C++ development experience (C++14/20) in Windows/Linux environments. - Strong proficiency in object-oriented design, STL, multithreading, and concurrency (synchronization, parallelism). - Solid understanding of networking fundamentals (TCP/IP, latency, throughput) and network programming. - Proven experience building complex, distributed, high-throughput, low-latency, and resilient systems. - Strong debugging skills and ability to quickly understand and work within large, complex codebases. - Demonstrated ability to leverage AI tools to accelerate ramp-up on large codebases, improve system understanding, and enhance debugging and development productivity. - Strong communication skills and ability to collaborate effectively across technical and business teams. - Self-driven, proactive, and capable of independently ramping up in complex environments. Benefits - Health Insurance: Highly competitive medical, dental, and vision programs. - Hybrid Environment: Flexibility of working in the office and from home. - Health Care and Dependent Care Flexible Spending Accounts: Pre-tax earnings for eligible health care and dependent day care expenses. - Maven Family Building Benefit: $10,000 lifetime reimbursement towards fertility, egg freezing, adoption, and surrogacy expenses. - Building Wealth - 401(k) Savings Plan: Immediate eligibility with a 100% match on the first 4% of compensation contributed. - Pre-Tax Commuter Benefits Program. - ARAG Legal Services. - Employee Assistance Program. - Tuition Reimbursement. - Financial Wellness Tools. - Travel Assistance Benefits. - Pet Insurance. - Corporate Gym Subsidies. - Wellness Perks. - Paid Time Off and Parental Leave.