Full Stack Developer - Sr

Apex Systems; Downey, Northern (CA, KY); Hybrid; USD 90,000 - 96,000; Part time

Benefits offered by this job

Partial remote work

Contract role

Benefits package

Job summary

Everforth Apex is seeking a Senior Full Stack Developer in Downey, CA, with partial remote option. You will design, build, and maintain enterprise-grade applications, covering back-end databases, middleware, and responsive front-end interfaces.

Expect close collaboration across teams and clear effort estimations. Requirements include a bachelor’s degree in computer science and at least five years of full-stack experience, with strong C#, .NET, SQL Server, and JavaScript (JQuery, Bootstrap).

Qualifications

• Bachelor's degree in computer science or a related field.
• At least five years of full-stack development experience.
• Proficiency in SQL Server with migration experience; strong .NET Framework/.NET Core, ASP.NET MVC, and C#; advanced JavaScript with JQuery.

Responsibilities

• Develop and maintain custom applications with back-end databases and middleware.
• Build and manage web services and front-end UI interfaces.
• Assist with database migration projects and scripting.

Skills

C#

JavaScript

ASP.NET MVC

SQL Server

JQuery

Bootstrap

Web API

ORM

Git

IIS

Postman

Education

Bachelor's degree in Computer Science

Tools

Visual Studio

SQL Server Management Studio

SoapUI

Git/SVN

Postman

Job description

# Full Stack Developer - SrApply**Job#: 3052692****Job Description:**Full Stack Developer - Sr**Location:** Downey, California (Partial Remote - 1 Day per week in Downey, CA)Role OverviewWe are seeking a Senior Full Stack Developer to design, develop, and maintain custom workflow applications. This role involves building robust back-end databases, middleware components, and front-end user interfaces. The ideal candidate will contribute to the full software development lifecycle, from gathering requirements to building and deploying systems that integrate with various enterprise platforms.Key Responsibilities* Develop and maintain custom applications, including back-end databases, stored procedures, and middleware using C#/.NET.* Build and manage web services and front-end UI interfaces.* Assist with database migration projects, including scripting and implementing migration patterns.* Write clean, maintainable, and high-quality code for both new and existing codebases.* Diagnose and resolve issues across the full technology stack, from front-end to back-end.* Gather requirements and ensure host systems can effectively house application information.* Collaborate with team members, share knowledge, and provide timely communication on project status and effort estimations.Required Qualifications**Education:** A bachelor's degree in computer science or a related field is required.**Experience:** At least five years of related experience in full-stack development is required.**Technical Skills:*** Proficiency in SQL Server with moderate database administration-adjacent experience, including knowledge of database migration.* Strong experience with the .NET Framework, including .NET Core, ASP.NET MVC, and C#.* Advanced JavaScript skills, including experience with JQuery.* Experience with Web API, ORM, JSON, and Bootstrap for responsive UI design.* Familiarity with version control systems such as Git or SVN.* Knowledge of tools such as Visual Studio, SQL Client Tools, Soap UI, IIS, and Postman.**Soft Skills:*** A collaborative team player with an eagerness to share knowledge.* Flexibility to adapt to changing project requirements.* Strong documentation and communication skills.* Ability to provide accurate estimations of effort for tasks.Preferred Qualifications* A Master's Degree is a plus.* A DBA Certificate is a plus but not required.* Experience with Microsoft Azure development.* Knowledge of different JavaScript libraries.* Experience with AI integrations.* Familiarity with NoSQL databases such as MongoDB.Work EnvironmentThis position offers a partial remote work arrangement, with a requirement to be onsite up to one day per week. The standard dress code for onsite work is business casual. *Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.**Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at https://www.apexsystems.com/privacy-policy**Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.**Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.**If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [e-mail] or 804-523-8228. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.**UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems.***Employee Type:** Contract**Location:** Downey, CA, US**Job Type:****Date Posted:** September 17, 2026**Pay Range:** $65 - $70 per hour