Oppenheimer & Co. Inc.
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.Net Web API Developer
role at
Oppenheimer & Co. Inc.
Who We Are Oppenheimer & Co. Inc. (“Oppenheimer”) is a leading middle‑market investment bank and full‑service broker‑dealer. With roots tracing back to 1881, the Company is engaged in a broad range of activities in the financial services industry, including retail securities brokerage, institutional sales and trading, investment banking (both corporate and public finance), equity & fixed income research, market making, trust services and investment advisory and asset management services.
Job Description Oppenheimer & Co. Inc. is seeking a .NET Web API Developer to join our IT team in our New York office. This individual will design, develop, test, and maintain server‑side logic and APIs for our suite of financial applications. They will collaborate with front‑end developers, database administrators, and business analysts to translate business requirements into efficient, secure, and reliable software solutions. The role involves enhancing existing systems, developing new features, and ensuring seamless integration between various platforms. Expertise in managing Sybase, SQL Server, and MongoDB databases is crucial.
Responsibilities
Design, develop, and maintain high-performance and scalable .NET Web APIs using C# and the .NET Framework/.NET Core
Collaborate with cross‑functional teams to define, design, and ship new features for financial applications
Develop robust data access layers and integrate APIs with multiple database systems, including Sybase, SQL Server, and MongoDB
Write clean, maintainable, and efficient code following best practices and established coding standards
Implement unit testing, integration testing, and performance testing to ensure code quality and application stability
Troubleshoot, debug, and resolve software defects and production issues in a timely manner
Participate in code reviews to maintain code quality, share knowledge, and ensure compliance with project standards
Manage API versioning, documentation (e.g., using Swagger/OpenAPI), and deployment processes
Stay up-to-date with emerging technologies and industry trends to continuously improve development practices and application performance
Apply specific knowledge of financial systems and business processes to improve application functionality and reliability
Skills / Requirements Experience:
Minimum of 5+ years of professional experience in .NET web development, specifically with .NET Web API, C#, and the .NET Framework/.NET Core
Proven experience working with and managing data in Sybase databases (Sybase ASE/IQ), preferred
Extensive experience with SQL Server database design, T‑SQL programming, and performance tuning
Hands‑on experience with MongoDB (or other NoSQL databases), including data modeling and query optimization
Experience with front‑end technologies (e.g., JavaScript, Angular/React) is a plus
Technical Skills
Proficiency in building RESTful APIs and microservices architecture
Strong understanding of object‑oriented programming (OOP) principles and design patterns
Experience with version control systems, preferably Git and Azure DevOps Server
Soft Skills
Strong analytical and problem‑solving skills
Excellent communication and collaboration abilities
Ability to work independently and as part of a team in a fast‑paced environment
Detail‑oriented and committed to producing high‑quality work
Preferred Qualification
Prior experience in the finance industry or working on financial software applications
Compensation For job postings in New York City, Oppenheimer is required by law to include a reasonable estimate of the salary range for this role. This salary range is specific to the City of New York and takes into account the wide range of factors that are considered in making salary decisions including but not limited to your skills, qualifications, experience, licensure and certifications, and other business and organizational needs. A reasonable estimate of the current base salary range is $110,000.00 - $130,000.00 at the time of this posting. Also, certain positions are eligible for additional forms of compensation such as discretionary bonus.
Seniority level: Mid‑Senior level
Employment type: Full‑time
Job function: Engineering and Information Technology
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.Net Web API Developer
role at
Oppenheimer & Co. Inc.
Who We Are Oppenheimer & Co. Inc. (“Oppenheimer”) is a leading middle‑market investment bank and full‑service broker‑dealer. With roots tracing back to 1881, the Company is engaged in a broad range of activities in the financial services industry, including retail securities brokerage, institutional sales and trading, investment banking (both corporate and public finance), equity & fixed income research, market making, trust services and investment advisory and asset management services.
Job Description Oppenheimer & Co. Inc. is seeking a .NET Web API Developer to join our IT team in our New York office. This individual will design, develop, test, and maintain server‑side logic and APIs for our suite of financial applications. They will collaborate with front‑end developers, database administrators, and business analysts to translate business requirements into efficient, secure, and reliable software solutions. The role involves enhancing existing systems, developing new features, and ensuring seamless integration between various platforms. Expertise in managing Sybase, SQL Server, and MongoDB databases is crucial.
Responsibilities
Design, develop, and maintain high-performance and scalable .NET Web APIs using C# and the .NET Framework/.NET Core
Collaborate with cross‑functional teams to define, design, and ship new features for financial applications
Develop robust data access layers and integrate APIs with multiple database systems, including Sybase, SQL Server, and MongoDB
Write clean, maintainable, and efficient code following best practices and established coding standards
Implement unit testing, integration testing, and performance testing to ensure code quality and application stability
Troubleshoot, debug, and resolve software defects and production issues in a timely manner
Participate in code reviews to maintain code quality, share knowledge, and ensure compliance with project standards
Manage API versioning, documentation (e.g., using Swagger/OpenAPI), and deployment processes
Stay up-to-date with emerging technologies and industry trends to continuously improve development practices and application performance
Apply specific knowledge of financial systems and business processes to improve application functionality and reliability
Skills / Requirements Experience:
Minimum of 5+ years of professional experience in .NET web development, specifically with .NET Web API, C#, and the .NET Framework/.NET Core
Proven experience working with and managing data in Sybase databases (Sybase ASE/IQ), preferred
Extensive experience with SQL Server database design, T‑SQL programming, and performance tuning
Hands‑on experience with MongoDB (or other NoSQL databases), including data modeling and query optimization
Experience with front‑end technologies (e.g., JavaScript, Angular/React) is a plus
Technical Skills
Proficiency in building RESTful APIs and microservices architecture
Strong understanding of object‑oriented programming (OOP) principles and design patterns
Experience with version control systems, preferably Git and Azure DevOps Server
Soft Skills
Strong analytical and problem‑solving skills
Excellent communication and collaboration abilities
Ability to work independently and as part of a team in a fast‑paced environment
Detail‑oriented and committed to producing high‑quality work
Preferred Qualification
Prior experience in the finance industry or working on financial software applications
Compensation For job postings in New York City, Oppenheimer is required by law to include a reasonable estimate of the salary range for this role. This salary range is specific to the City of New York and takes into account the wide range of factors that are considered in making salary decisions including but not limited to your skills, qualifications, experience, licensure and certifications, and other business and organizational needs. A reasonable estimate of the current base salary range is $110,000.00 - $130,000.00 at the time of this posting. Also, certain positions are eligible for additional forms of compensation such as discretionary bonus.
Seniority level: Mid‑Senior level
Employment type: Full‑time
Job function: Engineering and Information Technology
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