C# Engineer (Senior/Lead) ID41548 ($2,500 signing bonus)

AgileEngine is an Inc. 5000 company that creates award\-winning software for Fortune 500 brands and trailblazing startups across 17\+ industries. We rank among the leaders in areas like application development and AI/ML, and our people\-first culture has earned us multiple Best Place to Work awards. **WHY JOIN US** If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you! **ABOUT THE ROLE** As a **Senior/Lead C\# Backend Engineer** at AgileEngine, you will lead the modernization of our core systems by designing and developing highly concurrent, thread\-safe applications. You’ll optimize large\-scale data operations, leverage distributed processing with Apache Spark, and deploy scalable solutions on AWS, driving performance, reliability, and scalability across our platforms. **WHAT YOU WILL DO** \- Lead the design and development of highly concurrent, multi\-threaded applications in C\#; \- Re\-architect legacy synchronous workflows into scalable, thread\-safe solutions; \- Apply advanced knowledge of threading models, synchronization primitives, and performance tuning to optimize system throughput and minimize contention; \- Design, develop, and optimize complex SQL queries, stored procedures, and large\-scale data operations, including staging and transformations; \- Utilize **Apache Spark** for distributed data processing at scale; \- Deploy and manage solutions on **AWS** , ensuring reliability, scalability, and cost efficiency; \- Diagnose and resolve concurrency issues, perform application profiling, and drive continuous improvements in system performance; \- Collaborate with cross\-functional teams to define technical requirements, align architecture with business goals, and deliver high\-quality solutions. **MUST HAVES** \- **5\+ years of expert\-level proficiency in C\#** with hands\-on experience in multi\-threaded and parallel processing; \- Strong understanding of **threading models, synchronization primitives, and concurrency debugging;** \- Proven experience in **performance tuning and application profiling** for large\-scale systems; \- Advanced proficiency in **SQL** (query design, optimization, and data operations); \- Hands\-on experience with **Apache Spark** for distributed data processing; \- Proven experience deploying solutions on **AWS** ; \- Exceptional problem\-solving and debugging skills with a strong focus on scalability and reliability; \- Upper\-Intermediare English level. **NICE TO HAVES** \- Experience in re\-engineering legacy systems into modern architectures; \- Familiarity with microservices design principles and cloud\-native development patterns; \- Strong communication and collaboration skills with a track record of working in cross\-functional teams. **PERKS AND BENEFITS** \- **Professional growth:** Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps. \- **Competitive compensation:** We match your ever\-growing skills, talent, and contributions with competitive USD\-based compensation and budgets for education, fitness, and team activities. \- **A selection of exciting projects:** Join projects with modern solutions development and top\-tier clients that include Fortune 500 enterprises and leading product brands. \- **Flextime:** Tailor your schedule for an optimal work\-life balance, by having the options of working from home and going to the office – whatever makes you the happiest and most productive.