Aziz Ullah

Senior Consultant

Systems Limited • Período integral

Jul 2026 - Present • 2 mos

Client project: Nordstrom — OVI/EIS inventory platform, Seattle (remote). Same engagement, continued after Confiz merged into Systems Limited on 1 August 2026. · Worked with the team to take the API to 15,000 TPS — profiling under load, then clearing the ceilings we found · Handled JVM warm-up so newly scheduled pods absorb peak traffic without a first-request latency cliff · Tuned Kubernetes HPA thresholds and min/max pod counts against observed throughput · Raised cache hit rates via key design and TTLs, cutting datastore load at peak · Resolved Redis pipeline saturation and circuit-breaker instability under sustained load · Verified throughput with JMeter; New Relic (NRQL) observability across AWS EKS, RDS, S3, SQS, Lambda with Kafka · Managed production deployment approvals during soft-freeze windows

Senior Software Engineer

Confiz • Período integral

Apr 2026 - Jul 2026 • 3 mos

Deployed to Nordstrom's OVI/EIS inventory team as a senior backend Java engineer. Confiz merged into Systems Limited on 1 August 2026; the role and client engagement continued unchanged. · Spring Boot microservices for inventory data workflows and event ingestion · Led CI/CD migration from GitLab CI to GitHub Actions · PostgreSQL purge procedures and Flyway migrations on blue/green RDS — zero-downtime deployments · Designed and documented blue/green RDS refresh runbooks · HashiCorp Vault secrets, injected into pipelines and service config · Apache Airflow DAGs for scheduled ETL and operational automation

Senior Software Engineer/Data Consultant

Quorum • Período integral

Jun 2025 - Apr 2026 • 10 mos

Quorum Data, Inc. — independent real-world ad measurement and targeting (quorum.inc). · Core contributor to the data pipeline ingesting billions of ad impressions, resolving them to households, and powering real-time attribution reporting for hundreds of advertising agencies. · Redesigned the pixel reporting database schema, cutting query execution time by ~45% and enabling near real-time analytics. · Built ETL pipelines ingesting pixel data from AWS S3, client repositories and third-party APIs into Snowflake and PostgreSQL. · Worked on location intelligence and visit attribution — turning raw pixel and device-movement signal into the store-visit outcomes the product reports on. · Developed reporting workflows with SQL and Jasper Reports; technical owner of client-facing backend services. · Integrated with B2B advertising platforms including Viant, Xandr, LiveRamp, Facebook and TikTok.