Principal Full-Stack Software Engineer C#/.NET (Flex Hybrid)

Job Description:Position Title: Principal Full-Stack Software Engineer C#/.NETDepartment: Systems DevelopmentDivision:  Cboe Data and Access SolutionsLocation: Flex/Hybrid near a Cboe office (Lenexa, Chicago or NYC)Position Summary:Cboe Data and Access Solutions division is looking for a highly skilled and experienced Principal Software Engineer to join our team. This role is perfect for a seasoned engineer who is an expert in .NET/C# server-side development with some exposure to front-end technologies like ReactJS. You will be responsible for designing and implementing scalable back-end systems that power high-performance React-based front-end applications, particularly in financial analytics, execution, and risk management platforms. The ideal candidate has extensive experience in developing and engineering complex and performant server-side applications with expertise in real-time data processing, web streaming technologies, RESTful APIs, and securing applications and communications to deliver enterprise grade software solutions.Key Responsibilities:Lead the design, architecture, and implementation of scalable server-side applications using C#/.NET.Collaborate with front-end teams (using ReactJS) to ensure smooth and performant integration between the back-end and UI.Work closely with cross-functional teams, including product management, to understand requirements and deliver high-quality, well-architected solutions.Implement server communications leveraging secure APIs using streaming and RESTful transport protocols.Implement secure authentication and authorization mechanisms using OpenID Connect and OAuth.Ensure code quality through best practices, including unit testing, integration testing, and code reviews.Drive technical decisions and provide mentorship to other developers on the team.Independently research and resolve complex technical problems.Optimize application performance through analysis and tuning.Implement security code scanning and update software code to resolve security issues.Manage technical debt and help evolve the architecture to support future business needs.Self-manage assigned projects to ensure successful completion in designated time frames.Stay up to date with emerging technologies and frameworks, continuously improving and innovating our stack.Qualifications:Bachelor’s degree in Computer Science, Software Engineering, or a related field.8+ years of hands-on experience in professional full-stack development with a focus on C#/.NET.Strong OOP skills and experience with design patterns.Skills & RequirementsDevelopment:Advanced expertise in C#/.NET and ASP.NET for building scalable, high-performance back-end services.Proficiency in developing and consuming RESTful APIs and real-time communication protocols like WebSockets.Expertise in data serialization (MessagePack, Protobuf) and throughput optimization techniques, including compression.Experience with database technologies such as SQL Server, PostgreSQL, MySQL, and ORMs like Entity Framework.Strong understanding of data structures and algorithms, profiling and performance optimization.Prior experience with operating system APIs.Experience with microservices architecture.Security:Expertise in implementing authentication and authorization using OpenID Connect, OAuth 2.0, and related security standards.Proficiency in data protection mechanisms including encryption.Experience working with application security and vulnerability scanning and remediation techniques.Other Skills:Familiarity with Agile/Scrum methodologies and DevOps practices (CI/CD pipelines, automated testing, etc.).Comfortable with Windows and Linux operating systems.Excellent communication, problem-solving, and leadership skills.Nice to Have:Experience with financial industry systems.Proficiency in front-end technologies such as Javascript, TypeScript, ReactJS.Familiarity with gRPC or GraphQL.Understanding of microservices architecture, containerization (Docker/Kubernetes), and cloud platforms (Azure, AWS, or GCP).We offer:Competitive salary and bonusMedical, Dental, Vision, Life insurance401k plan with match, paid time off, paid holidaysRemote employment and transportation benefitsDynamic work environment with great opportunity for personal development#LI-HYBRID#LI-JS1Our pay ranges are determined by a number of factors, including, but not limited to, role, experience, level, and location. The national new hire base pay range for this job in the United States is $165,750-$204,750. This range represents the minimum and maximum base pay the company expects to offer for new hires working in the position full time. If you live in one of the following areas or if you work in a Cboe office in the following areas, the range may be higher according to the geographic differentials listed below:US Geographic Differentials:110%: Austin TX, Chicago IL, Denver CO, San Diego CA 115%: Los Angeles CA, Seattle WA 120%: Boston MA, Washington DC 125%: New York City NY  130%: San Francisco CA Within the range, individual pay is determined by a number of factors, including, but not limited to, work location, job-related skills, experience, and relevant education or training. In addition to base pay, our total rewards program includes an annual variable pay program and benefits including healthcare (medical, dental and vision), 401 (k) with a generous company match, life and disability insurance, paid time off, market-leading tuition assistance, and much more!  Your recruiter will provide more details about the total compensation package, including variable pay and benefits, during the hiring process. For further information on our total rewards program, visit TOTAL REWARDS @CBOE. Any communication from Cboe regarding this position will only come from a Cboe recruiter who has a @cboe.com email or via LinkedIn Recruiter. Cboe does not use any other third party communication tools for recruiting purposes.SummaryLocation: Chicago, IL; New York, NY; Lenexa, KSType: Full time