Senior Full-Stack Engineer (React & .NET Core)

Genesis10•Pennington, NJ

20h•Hybrid

About The Position

Genesis10 is seeking a high-caliber, results-driven Senior Full-Stack Engineer to join a core engineering team at a Global Financial Institution. This role involves designing, building, and scaling high-performance enterprise applications from the database to the user interface. The ideal candidate will be a strong, autonomous engineer who architects scalable solutions, champions best practices, and elevates the team's technical capabilities. This is a 12+ month contract position.

Requirements

5+ years of professional software development experience, with a proven track record of delivering complex web-scale applications using React and .NET
Advanced proficiency in JavaScript (ES6+), TypeScript, and React.js core principles
Deep experience with state management libraries (Redux Toolkit, Zustand) and modern build tools (Webpack, Vite)
Strong expertise in C#, .NET Core / .NET 6/7/8, and ASP.NET Web API
Solid understanding of object-oriented programming (OOP), asynchronous programming, and architectural patterns (Clean Architecture, DDD, MVC)
Proficiency with relational databases (SQL Server, PostgreSQL) and ORM tools (Entity Framework Core)
Experience with Git, CI/CD pipelines, Jira, and modern IDEs (Visual Studio, VS Code)

Nice To Haves

Familiarity with cloud platforms (Azure or AWS) and containerization (Docker, Kubernetes)

Responsibilities

Design, develop, and maintain robust, scalable web applications using React on the front end and ASP.NET Core on the back end
Build responsive, high-performance, and reusable UI components and libraries using React, TypeScript, Redux/Context API, HTML5, and CSS3
Architect and optimize secure RESTful APIs, microservices, and server-side logic using C#, .NET Core, and Entity Framework Core
Design schema structures, write complex queries, and optimize performance using MS SQL Server, PostgreSQL, or NoSQL databases
Conduct rigorous code reviews, enforce unit and integration testing standards (xUnit, Jest, Cypress), and maintain clean, well-documented code
Work closely with Product Managers, UX/UI Designers, and DevOps engineers in an Agile/Scrum environment to ship features seamlessly
Troubleshoot production bottlenecks, optimize application speed, memory usage, and cross-browser compatibility

Benefits

Access to hundreds of clients, most who have been working with Genesis10 for 5-20+ years.
The opportunity to have a career-home in Genesis10; many of our consultants have been working exclusively with Genesis10 for years.
Access to an experienced, caring recruiting team (more than 7 years of experience, on average.)
Behavioral Health Platform
Medical, Dental, Vision
Health Savings Account
Voluntary Hospital Indemnity (Critical Illness & Accident)
Voluntary Term Life Insurance
401K
Sick Pay (for applicable states/municipalities)
Commuter Benefits (Dallas, NYC, SF, and Illinois)