Senior Software Engineer – C# ID55642

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

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