C++ Developer

Position Description:

CGI is a global IT and business consulting services firm delivering end-to-end solutions that drive meaningful outcomes for clients worldwide. With a strong presence across industries and a collaborative ownership-driven culture CGI empowers professionals to build innovative solutions while shaping mission-critical systems at scale.

We are seeking a highly skilled C Developer to design build and optimize high-performance backend services in a Linux environment. This role focuses on developing resilient event-driven systems that handle real-time data and complex network interactions. You will work on long-running services and contribute to architecture decisions performance tuning and production stability.

This position is ideal for engineers who thrive in low-level systems programming asynchronous design and debugging complex multithreaded environments. You will collaborate with cross-functional teams to deliver scalable and reliable backend platforms.

This position is located at the client site in Merrimack NH or Westlake TX.

Your future duties and responsibilities:

. Design and develop high-performance backend daemons using modern C (C17 or newer) on Linux
. Build and maintain multithreaded systems including thread lifecycle management synchronization and safe shutdown handling
. Implement robust networked services using TCP/IP sockets with full connection lifecycle management
. Develop and maintain secure communication layers using TLS/SSL including certificate handling and troubleshooting handshake issues
. Build asynchronous I/O systems leveraging and WebSocket clients using
. Architect and enhance event-driven systems using frameworks such as libevent or epoll-based reactors
. Troubleshoot complex production issues using logs metrics and timing data without relying solely on debugger reproduction
. Ensure safe object lifecycle management in asynchronous code using sharedptr callbacks and queued execution models
. Contribute to system performance improvements scalability and reliability in production environments

Required qualifications to be successful in this role:

. Strong experience with modern C (C17) in Linux environments particularly building long-running backend services
. Proven expertise in multithreading including synchronization race condition avoidance and debugging deadlocks or teardown failures
. Hands-on experience with network programming using TCP/IP sockets including handling partial reads/writes and connection edge cases
. Production experience implementing TLS/SSL secure communication and diagnosing related operational issues
. Strong experience with asynchronous programming using and familiarity with for WebSocket communication
. Experience with event-driven server architectures such as libevent or epoll-based frameworks
. Demonstrated ability to debug production issues using observability signals such as logs counters and latency metrics
. Deep understanding of memory management object lifetime and ownership models in asynchronous C systems
. Familiarity with Linux service development including pthreads signals file descriptors and linking strategies


Desired qualifications:

. Experience building low-latency or market-data style systems with subscription state fanout deduplication and cache-aware response paths.
. Boost stack experience beyond basics: Boost. Test BoostAsio .
. Experience with observability in C services including Prometheus-style metrics latency percentiles service health endpoints and operational stats.
. Experience with custom queues and work dispatch patterns in multithread application architecture.
. Experience with creating scenario based tests using Cucumber framework.

Education: Bachelors degree in computer science or related field


Other Information:
CGI is required by law in some jurisdictions to include a reasonable estimate of the compensation range for this role. The determination of this range includes various factors not limited to skill set level experience relevant training and licensure and certifications. To support the ability to reward for merit-based performance CGI typically does not hire individuals at or near the top of the range for their role. Compensation decisions are dependent on the facts and circumstances of each case. A reasonable estimate of the current range for this role in the U.S. is $80600.00 - $194000.00.

CGIs benefits are offered to eligible professionals on their first day of employment to include:
. Competitive compensation
. Comprehensive insurance options
. Matching contributions through the 401(k) plan and the share purchase plan
. Paid time off for vacation holidays and sick time
. Paid parental leave
. Learning opportunities and tuition assistance
. Wellness and Well-being programs


#LI-LW3

Skills:

• C
• Linux
• TCP/IP
• TLS/SSL
• Cucumber
• Prometheus

What you can expect from us:

Together as owners lets turn meaningful insights into action.

Life at CGI is rooted in ownership teamwork respect and belonging. Here youll reach your full potential because

You are invited to be an owner from day 1 as we work together to bring our Dream to life. Thats why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our companys strategy and direction.

Your work creates value. Youll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas embrace new opportunities and benefit from expansive industry and technology expertise.

Youll shape your career by joining a company built to grow and last. Youll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.

Come join our teamone of the largest IT and business consulting services firms in the world.

Qualified applicants will receive consideration for employment without regard to their race ethnicity ancestry color sex religion creed age national origin citizenship status disability pregnancy medical condition military and veteran status marital status sexual orientation or perceived sexual orientation gender gender identity and gender expression familial status or responsibilities reproductive health decisions political affiliation genetic information height weight or any other legally protected status or characteristics to the extent required by applicable federal state and/or local laws where we do business.

CGI provides reasonable accommodations to qualified individuals with disabilities. If you need an accommodation to apply for a job in the U.S. please email the CGI U.S. Employment Compliance mailbox at . You will need to reference the Position ID of the position in which you are interested. Your message will be routed to the appropriate recruiter who will assist you. Please note this email address is only to be used for those individuals who need an accommodation to apply for a job. Emails for any other reason or those that do not include a Position ID will not be returned.

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All CGI offers of employment in the U.S. are contingent upon the ability to successfully complete a background investigation. Background investigation components can vary dependent upon specific assignment and/or level of US government security clearance held. Dependent upon role and/or federal government security clearance requirements and in accordance with applicable laws some background investigations may include a credit check. CGI will consider for employment qualified applicants with arrests and conviction records in accordance with all local regulations and ordinances.

CGI will not discharge or in any other manner discriminate against employees or applicants because they have inquired about discussed or disclosed their own pay or the pay of another employee or applicant. However employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information unless the disclosure is (a) in response to a formal complaint or charge (b) in furtherance of an investigation proceeding hearing or action including an investigation conducted by the employer or (c) consistent with CGIs legal duty to furnish information.