Oppenheimer & Co. Inc. · 15 hours ago
.Net Web API Developer
New York, NY
Full-time
Onsite
Mid, Senior Level
$110K/yr - $130K/yr
5+ years expOppenheimer & Co. Inc. is a leading middle-market investment bank and full service broker-dealer. They are seeking a .NET Web API Developer to design, develop, test, and maintain server-side logic and APIs for their financial applications, collaborating with various teams to ensure efficient software solutions.
Financial Services
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, preferred
Qualification
Required
Minimum of 5+ years of professional experience in .NET web development, specifically with .NET Web API, C#, and the .NET Framework/.NET Core
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
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
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
Proven experience working with and managing data in Sybase databases (Sybase ASE/IQ)
Experience with front-end technologies (e.g., JavaScript, Angular/React)
Prior experience in the finance industry or working on financial software applications
Benefits
Certain positions are eligible for additional forms of compensation such as discretionary bonus
Company
Oppenheimer & Co. Inc.
Oppenheimer is a global financial institution offering Wealth Management, Capital Markets, and Investment Banking solutions.
1001-5000 employees
H1B Sponsorship
Oppenheimer & Co. Inc. has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (4)
2024 (7)
2023 (6)
2022 (1)
2021 (6)
2020 (4)
Funding
Current Stage
Public CompanyTotal Funding
unknown1986-09-05IPO
Leadership Team
Craig Schneider
Managing Director - Regional Director
Douglas Siegel
Managing Director, Chief Compliance Officer
Recent News
2026-01-08
2026-01-07
Company data provided by crunchbase