Senior .NET /C # Developer

Yoh Services LLC; Greenwich (CT); On-site; USD 124,000 - 138,000; Full time

Benefits offered by this job

Medical, prescription, dental & vision

Health Savings Account (HSA)

Life & Disability Insurance

401K Retirement Savings Plan

Direct Deposit & weekly epayroll

Referral Bonus Programs

Certification and training

Equal Opportunity Employer

Job summary

Yoh Services LLC is seeking a Senior .NET/C# Developer to work on backend systems and API integrations for a hedge fund client in Greenwich, CT. The role involves 6-12+ month contract work with a pay rate of $90–$100 per hour, with occasional Angular frontend tasks.

Ideal candidates have 10+ years of hands-on C#/.NET experience, strong API and SQL skills, and familiarity with messaging patterns. Some AWS and Geneva integration experience are preferred.

Qualifications

• 10+ years of hands-on software engineering experience, building enterprise applications using C#/.NET.
• Strong backend C#/.NET development experience.
• Strong experience with API integration, including vendor APIs, internal integration layers, REST/web services, or similar patterns.
• Ability to think through data movement, request/response workflows, latency, reliability, and integration performance.
• Strong SQL/database experience.
• Experience with MQ / messaging technologies or asynchronous integration patterns.
• Outstanding hands on coding, debugging, and analytical skills.
• Experience refactoring and re-architecting existing applications.
• Experience with source/version control systems such as Git.
• Familiarity with software development best practices, testing methodologies, validation, and production-quality code.
• Ability to work independently while collaborating effectively within a small team.
• Strong technical judgment, including knowing when to make decisions independently and when to elevate larger design decisions.
• Strong communication skills.
• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related discipline

Responsibilities

• Code hands-on backend development and API integration for enterprise software.
• Build and enhance custom software connecting internal business apps to Geneva via APIs and integration layers.
• Refactor and re-architect existing applications; focus on data movement, integration design, testing, and validation.
• Some Front-end work in Angular; beneficial but not required.

Skills

C#/.NET

APIs integration

SQL/databases

Messaging systems

Git / source control

Angular (frontend)

Communication skills

Independent work

Education

Bachelor’s or Master’s degree in CS/Engineering

Tools

Geneva platform

AWS

Job description

Job Titile:Senior .NET /C # Developer

Location: Greenwich CT office every Tuesday and Wednesday.

Terms:6-12 Months+ contract

Pay Rate: $90hr - $100/hr

Our client is a leading Hedge Fund company and isseeking to integrate next generation, in-house developed based Application with Geneva Platform. (Geneva experience is not Required).

NOTES FROM THE HIRING MANAGER

• Seeking a 10 year +C#/.NET Developer /Engineer to do code hands on backend development, API integration, SQL/database experience, messaging, and the ability to build reliable enterprise software.
• The Developer will help build and enhance custom software that connects internal business applications to Geneva through APIs and integration layers.
• Refactoring and re-architecting existing systems, API development, data movement, integration design, rigorous testing, and validation.
• There is some Front-end development in Angular. While being an expert is not required – it would be great at least one of the two candidates have Angular.
• Detail-oriented engineers with strong technical judgment, ownership mindset, and the ability to work independently without heavy supervision.

Key Requirements

• 10+ years of hands-on software engineering experience, building enterprise applications using C#/.NET
• Strong backend C#/.NET development experience
• Strong experience with API integration, including vendor APIs, internal integration layers, REST/web services, or similar patterns
• Ability to think through data movement, request/response workflows, latency, reliability, and integration performance
• Strong SQL/database experience
• Experience with MQ / messaging technologies or asynchronous integration patterns
• Outstanding hands on coding, debugging, and analytical skills
• Experience refactoring and re-architecting existing applications
• Experience with source/version control systems such as Git
• Familiarity with software development best practices, testing methodologies, validation, and production-quality code
• Ability to work independently while collaborating effectively within a small team
• Strong technical judgment, including knowing when to make decisions independently and when to elevate larger design decisions
• Strong communication skills.
• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related discipline

Preferred / Plus Skills

• Experience with Angular or similar modern frontend frameworks
• Experience with JavaScript / TypeScript (obviously if they have Angular this will be fine
• Experience with Geneva or Advent Geneva
• Experience with AWS or other cloud platforms
• Experience in middle office, back office, investment operations, portfolio accounting, trade processing, reconciliations, or financial services technology
• Working knowledge of AI-assisted development tooling, with the ability to review, validate, and explain AI-generated code
• Willingness and flexibility to support occasional off-hours work as needed Ideal Candidate Profile

Estimated Min Rate: $90.00

Estimated Max Rate: $100.00

What’s In It for You?

• Medical, Prescription, Dental & Vision Benefits (for employees working 20+ hours per week)
• Health Savings Account (HSA) (for employees working 20+ hours per week)
• Life & Disability Insurance (for employees working 20+ hours per week)
• MetLife Voluntary Benefits
• Employee Assistance Program (EAP)
• 401K Retirement Savings Plan
• Direct Deposit & weekly epayroll
• Referral Bonus Programs
• Certification and training opportunities

Note: Any pay ranges displayed are estimations. Actual pay is determined by an applicant's experience, technical expertise, and other qualifications as listed in the job description. All qualified applicants are welcome to apply.

Yoh, a Day & Zimmermann company, is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.

Visit https://www.yoh.com/applicants-with-disabilities to contact us if you are an individual with a disability and require accommodation in the application process.

For California applicants, qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. All of the material job duties described in this posting are job duties for which a criminal history may have a direct, adverse, and negative relationship potentially resulting in the withdrawal of a conditional offer of employment.

It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

By applying and submitting your resume, you authorize Yoh to review and reformat your resume to meet Yoh’s hiring clients’ preferences. To learn more about Yoh’s privacy practices, please see our Candidate Privacy Notice: https://www.yoh.com/privacy-notice