Software Engineer III (Full Stack / .NET + React)Overview
We are seeking an experienced Software Engineer III to design, develop, and deliver scalable, high-performing solutions as part of a modern engineering team. This role combines strong backend .NET expertise with advanced frontend development in React, and includes mentorship, architectural input, and ownership of key system components.
Key Responsibilities
Design, develop, and implement scalable software solutions and new product features
Build and enhance large-scale React-based applications and strategic platform initiatives
Participate in the full Software Development Life Cycle (SDLC): design, development, testing, and deployment
Translate business and functional requirements into technical solutions
Contribute to architectural discussions and influence technical direction
Develop high-quality frontend components with a focus on performance and usability
Improve system performance, scalability, and reliability while reducing operational overhead
Own and deliver complete components or features within applications
Collaborate with distributed engineering teams to determine optimal technical solutions
Design solutions in ambiguous/problem spaces and define system interactions
Establish and promote engineering best practices, standards, and technologies
Mentor junior developers and support team growth
Track issues through resolution and provide regular updates to leadership
Perform code reviews and contribute to design reviews across projects
Provide project estimates, task breakdowns, and risk assessments
Identify long-term architectural improvements and technical debt
Occasionally serve in a Team Lead capacity
Act as a subject matter expert for assigned applications
Continuously improve development processes and team effectiveness
Required Technical Skills
Core Technologies:
.NET / .NET Core
C#
ASP.NET / MVC architecture
REST APIs
React
JavaScript / TypeScript
SQL Server
Microservices architecture
Additional Technologies:
MongoDB, PostgreSQL
Redis or caching solutions
CI/CD tools (Jenkins or equivalent)
Git-based source control (GitHub, GitLab, etc.)
Terraform, Ansible (nice to have)
Cloud platforms (AWS, Azure, or GCP) - preferred
Required Qualifications
7+ years of software development experience with a focus on .NET technologies
Strong proficiency in C# and .NET / .NET Core
Experience with ASP.NET and MVC design patterns
Expertise in building single-page applications (SPA)
Experience developing and consuming RESTful and/or RPC APIs
Advanced React experience (components, routing, state management)
Strong knowledge of web technologies (HTML5, CSS3, JavaScript/TypeScript)
Experience building microservices-based architectures
Strong experience with relational databases (SQL Server, PostgreSQL)
Experience with NoSQL solutions (MongoDB) and caching tools (Redis)
Experience with CI/CD pipelines and automated deployments
Soft Skills & Competencies
Strong analytical and problem-solving skills
Excellent verbal and written communication skills
High attention to detail and accuracy
Ability to manage multiple priorities in a fast-paced environment
Strong collaboration skills across distributed teams
Ability to adapt to changing priorities and deadlines
Work Environment & Expectations
Ability to manage multiple concurrent tasks and deadlines
Strong focus and attention to detail for extended periods
Effective decision-making and problem resolution under pressure
Comfortable working in dynamic, evolving technical environments
Job Type & Location
This is a Contract position based out of Lenexa, KS.
Pay and Benefits
The pay range for this position is $105.55 - $112.50/hr.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: - Medical, dental & vision - Critical Illness, Accident, and Hospital - 401(k) Retirement Plan - Pre-tax and Roth post-tax contributions available - Life Insurance (Voluntary Life & AD&D for the employee and dependents) - Short and long-term disability - Health Spending Account (HSA) - Transportation benefits - Employee Assistance Program - Time Off/Leave (PTO, Vacation or Sick Leave)
Workplace Type
This is a fully onsite position in Lenexa,KS.
Application Deadline
This position is anticipated to close on May 8, 2026.
h4>About TEKsystems:
We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.
The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.
About TEKsystems and TEKsystems Global Services
We're a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We're a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We're strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We're building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.
The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.
