Abu Qamar

Software Development Engineer - 1

• Built a scalable exam platform from the ground up using Next.js, React Query, and styled-components, supporting live, time-bound, multi-section exams with 8+ question types — MCQ, SCQ, Fill-in-the-Blanks, Coding, SQL, Terminal-based, and Match-the-Following — currently serving 10,000+ learners.
• Built a leaderboard with dual interfaces — a student-facing view (ranks, performance stats) and an admin-facing view (granular submission tracking, question-level insights) — reducing evaluation review time by 50%. Optimized state management using Zustand with MAP-based O(1) lookups, reducing redundant API calls by 40%.
• Engineered a client-side queuing system for seamless offline test-taking with automatic sync on reconnection, debounced API calls, and periodic retry — achieving zero submission loss even on unstable networks.
• Transformed 30+ scattered dashboards into a single, secure admin portal using Hasura, custom auth middleware, and Cloudscape design system, dramatically reducing onboarding time and operational errors.
• Built a template-driven landing page system with slug-based dynamic routing, empowering marketing teams to launch course pages instantly without developer intervention, improving go-to-market speed by 80%.
• Built a fully optimized Job Board using Strapi CMS and React, empowering 2 lakh+ active users to discover and apply for jobs with advanced filtering, bookmarking, and search.
• Integrated Google Maps APIs for user location tracking, managing 100k monthly requests, enabling location-based targeted ads and a 30% increase in lead generation.
• Developed a referral system with real-time activity tracking using Appsmith dashboards powered by Hasura GraphQL APIs with PostgreSQL and MongoDB as backing stores.
• Built a live terminal practice environment using WebSockets and AWS ECS with isolated containerized environments. Reduced container startup latency from ~30s to 2–3s via a warm-pool strategy.
• Implemented runtime-configurable warm pool scaling using Consul, enabling traffic-aware container pre-provisioning — auto-scaling up on weekends and down on weekdays to optimize performance and cost.
• Designed a secure OTP delivery system where the LMS acts as a gateway to VPC-isolated backend services, supporting OTP flows across authentication, evaluation access, and notifications.
• Detected and mitigated an OTP abuse attack (~500k requests/day). Integrated Cloudflare Turnstile with Google reCAPTCHA fallback and runtime provider switching via Consul, bringing traffic down to 2–3k/day.
• Built an AI-powered screening pipeline using N8N workflows, Gemini Flash 2.0, and Groq. Processed 7,000+ applications in under 1 hour, shortlisting 310 candidates at $0.001 per resume — replacing 2+ months of manual screening.
• Built automated evaluation pipelines using Jenkins and GitLab CI that dynamically provision AWS ECS tasks to grade submissions in fully isolated environments.
• Implemented global error ID tracking with centralized logging to Datadog via FluentBit, enabling end-to-end request tracing and reducing debugging time from hours to minutes.
• Set up production monitoring and automated incident escalation using Squadcast and Slack with routing policies — primary → secondary → team lead — ensuring no incident goes unnoticed.
• Owned end-to-end quality assurance in a QA-less team — handling test planning, manual and automated testing, production debugging, incident response, and post-mortems.
• Led the complete infrastructure migration from GCP to AWS for staging and production, enabling horizontal scaling and saving INR 8L+ per month in infrastructure costs.
• Secured infrastructure by implementing Cloudflare Zero Trust Network Access, eliminating bastion hosts. Designed a failover strategy using Route53 DNS switching, enabling CDN outage recovery in under 2 minutes.

Full Stack Developer Intern

• Developed backend and frontend services for admin, wallet, ticketing, and payment gateway modules in a microservices-based architecture, designing secure inter-service communication with data consistency and fault isolation.
• Optimized transaction flows for low-latency performance and reliable wallet balance reconciliation at scale through database query tuning and efficient transaction handling.
• Implemented robust input validation, centralized error handling, and structured logging across all services, improving observability and production monitoring for live services.