Onsite _C++ Developer_ O’Fallon, MO

THEMESOFT; Montana; On-site; USD 115,000 - 150,000; Full time

Job summary

The Themesoft Inc team is seeking a seasoned C/C++ Developer to design, build, and deploy AI-powered products on-site in the United States. You will contribute to complex agentic systems, drive production-readiness, and help establish reliability and governance across deployments.

Applicants should have deep expertise in C/C++, Linux, and Google Test, with the ability to lead reviews, design interfaces, and mentor junior engineers in a fast-paced contract environment.

Qualifications

• 8+ years of experience in C/C++, Linux, and Google Test.

Responsibilities

• Partner with Product Management to elaborate features, stories, and test strategy for each initiative
• Create technical design and assign work to developers
• Develop complex stories in C and write unit tests in C++ (Google Test)
• Be a human quality gate by leading code and design reviews
• Collaborate with other Principals and Leads to define interfaces and interactions between systems
• Advise on implementation strategy for successful deployment
• Implement development process improvements and automation
• Coach and develop junior employees
• Deliver department and external presentations

Skills

C

C++

Linux

Google Test

Tools

Google Test

Job description

JobTitle: C,C++ Developer

Location: O’Fallon, MO

WorkArrangement:Onsite

EmploymentType:Contract

ContractDuration:6-12+ Months

Role Description

• Design, develop, and deploy AI-powered products, intelligent agents, and agentic workflows utilizing Large Language Models (LLMs), retrieval systems, orchestration frameworks, tool-calling patterns, and context-aware workflows.
• Architect and implement advanced agentic systems incorporating planning, reasoning loops, memory management, grounding, evaluation frameworks, safety mechanisms, and human-in-the-loop controls.
• Lead the transition of AI solutions from proof-of-concept to production by establishing best practices for reliability, observability, performance, security, governance, and cost optimization.
• Develop scalable AI applications and developer productivity solutions using modern AI frameworks, SDKs, and orchestration platforms.

Responsibilities

• Partner with Product Management to elaborate features, stories, and test strategy for each initiative
• Create technical design and assign work to developers
• Develop complex stories in C and write unit tests in C++ (Google Test)
• Be a human quality gate by leading code and design reviews
• Collaborate with other Principals and Leads to define interfaces and interactions between systems
• Advise on implementation strategy for successful deployment
• Implement development process improvements and automation
• Coach and develop junior employees
• Deliver department and external presentations

8+ Years if exp in C.C++ ,Linux ,google test

Work Authorization

• Applicants must be legally authorized to work in the United States.

Themesoft Inc is an Equal Employment Opportunity employer. We consider qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other status protected by applicable federal, state, or local law.