Backend Engineer (Senior) ID55642

AgileEngine • Downey, CA

2d • Hybrid

About The Position

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.

Requirements

• 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

Responsibilities

• 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

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.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 251-500 employees