Kausar Sayyed — Senior Software Engineer

Backend Engineer @ Marqeta | Building Scalable Payments Infrastructure | Java • Terraform • Kafka • AWS I’m a Software Engineer passionate about distributed systems, microservices, and high-scale backend challenges. At Marqeta, I work on mission-critical payment systems, ensuring reliability, scalability, and security. 🔹 What I Do: Design & optimize event-driven architectures (Kafka, Debezium) to reduce replication lags and automate fault recovery. Instrument granular metrics (Java, AWS Lambda, SQS) for real-time monitoring in Datadog, improving system visibility. Enhance PCI compliance by implementing SHA-256 HMAC hashing for secure transaction workflows (MySQL, Snowflake). Collaborate cross-functionally to ensure seamless data flows between upstream/downstream services. Part of hiring process and developing the best , mentored junior engineers as well as conducted interview to grow the company 🔹 Past Impact (Paytm & Amdocs): Scaled India’s top payment gateway, integrating AMEX, Citibank for net banking, reducing transaction costs by 50%. Boosted revenue by 35% via cost-based routing (lowest-cost channel selection). Built high-availability processors (70% uptime improvement) for UPI, net banking, and card transactions (100+ TPS). Automated CI/CD pipelines (Jenkins), cutting testing time by 100% at Amdocs. 🔹 Tech I Work With: Java | Kafka | AWS | Microservices | MySQL | Snowflake | Datadog | Kubernetes (learning) | Terraform 🔹 What’s Next? I’m excited about backend/distributed systems roles at companies tackling scale, reliability, and fintech challenges. Let’s connect if you’re building something interesting! (Open to conversations about impactful engineering opportunities.)

Stackforce AI infers this person is a Backend Engineer specializing in Fintech with expertise in scalable payment systems.

Location: Toronto, Ontario, Canada

Experience: 5 yrs 10 mos