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 backend engineer, you will design and optimize high-performance, multi-threaded systems, transforming legacy workflows into scalable, thread-safe architectures. Leveraging deep expertise in c#, sql, and aws, you’ll drive concurrency improvements, enhance system throughput, and support large-scale data processing with technologies like apache spark. This role offers strong technical ownership and the opportunity to shape reliable, high-impact backend systems in complex environments. 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; 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 4 years of experience as a software engineer; expert-level proficiency in c# with experience in multi-threaded and parallel processing; understanding of c++; 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; proven experience deploying solutions on aws; strong problem-solving and debugging skills focused on scalability and reliability; upper-intermediate english level. Nice to haves hands-on experience with apache spark; 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 cross-functional teams. Perks and benefits professional growth: mentorship, techtalks, and personalized growth roadmaps. Competitive compensation: usd-based pay with education, fitness, and team activity budgets. Exciting projects: modern solutions with fortune 500 and top product companies. Flextime: flexible schedule with remote and office options. J-18808-ljbffr