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: Adaptable schedule with remote and office options

📌 Senior Software Engineer – C# (Villanueva)
🏢 Agileengine
📍 Villanueva