Hello, I'm Arhant Jain

Distributed Systems & Event-Driven Architecture

• Designed a serverless RESTful API layer (Lambda + API Gateway + DynamoDB) from scratch, serving as the single source of truth for all financial transaction state — handling concurrent reads/writes at scale with optimistic locking and conditional expressions
• Architected an event-driven credit decisioning pipeline using SQS-triggered Lambda consumers, a state machine orchestrator, and pub/sub fan-out to coordinate pre-qualification, credit bureau pulls, and fraud detection — fully decoupled, idempotent, and replayable from any point of failure
• Designed the event framework architecture for the next-gen platform backbone — analyzing throughput bottlenecks, dead letter queue patterns, and event schema evolution strategies across the service mesh
• Built producer/consumer patterns with SQS FIFO queues for ordered financial event processing, ensuring exactly-once delivery semantics for credit bureau response handling

Security Engineering & Cryptography

• Built an in-process message-level encryption (MLE) package implementing JWS (RS256/RS384/RS512) signature verification and JWE (RSA-OAEP) payload decryption — with TTL-based key caching (60s private / 300s public), adding <10ms p99 overhead per request
• Integrated AWS KMS for private key operations (key material never leaves AWS) and Secrets Manager for partner public key lifecycle, with per-partner configuration and automated cache invalidation for key rotation
• Designed the MLE infrastructure to unblock a tier-1 enterprise partnership and scale to 150+ partners with three deployment modes (disabled → optional → required) for zero-disruption rollout
• Created LibRefresh — an automated supply chain security tool that pins dependencies to n-1 versions with configurable release-age thresholds, scanning and patching 20+ repos (Python + Node.js) against known CVEs before they reach production
• Led organization-wide secret rotation: Artifactory API key deprecation, GitHub global secret migration, OAuth provider cutover (Bridge 1 → Okta), and origin secret propagation across 10+ service repositories — all with zero downtime

Site Reliability & Multi-Region Infrastructure

• Key contributor to the active-active multi-region deployment — deploying identical stacks across two AWS regions with Route53 weighted routing and automated health-check failover, cutting RTO from 30 minutes to under 4 minutes
• Executed live cross-region stack migrations (us-east-1 → us-east-2) for production Lambda, API Gateway, DynamoDB, and CloudFront distributions — zero-downtime cutover while serving real financial transactions
• Maintain 99.95%+ monthly availability (21 minutes/month max downtime) with custom health-check Lambda probes, CloudWatch composite alarms, and automated PagerDuty escalation
• Led the observability platform migration from Splunk to New Relic — building APM dashboards, alert conditions, and SLI/SLO definitions that reduced MTTD by 40%+
• Serve as on-call escalation lead — authored runbooks, post-incident reviews, and drove root-cause fixes for production incidents across quarterly support rotations

CI/CD & Infrastructure as Code

• Migrated 4+ production services from Jenkins to GitHub Actions — designing reusable composite actions for build/test/deploy with matrix strategies, Terraform plan/apply gates, and automated rollback on health-check failure
• Built multi-region deployment pipelines that deploy to primary and standby regions in parallel, with automated failover validation and deploy-to-standby safeguards preventing accidental active-stack mutations
• Manage infrastructure as code with Terraform (Lambda, API Gateway, DynamoDB, SQS, Route53, CloudFront, WAF) and Serverless Framework, with state locking via S3+DynamoDB and drift detection
• Drove the OAuth provider migration across all external APIs — re-architecting CloudFront → API Gateway → Lambda Edge authorizer flow, remapping partner client IDs, and reloading API scopes with zero partner downtime

Technical Leadership

• Lead 6 engineers across 3 squads — own sprint planning, backlog prioritization, story decomposition, and delivery commitments against quarterly engineering roadmap milestones
• Author Design & Engineering Proposals (DEPs) and conduct Production Readiness Reviews (PRRs) for new features, aligning product, engineering, and enterprise architecture on technical direction
• Mentor engineers through daily code reviews, pair programming sessions, and architecture whiteboarding, building a team culture of ownership, documentation-first design, and blameless incident response
• Spearheading AI-assisted developer tooling — building intelligent code review automation to accelerate PR feedback loops and catch patterns across the codebase at scale

NYU's Center for K-12 STEM Education runs outreach programs bringing engineering and computer science education to middle and high school students across New York City.

• Built an automated student application pipeline using Google Apps Script and Python, replacing a manual spreadsheet process and achieving a 4x efficiency increase in processing 500+ annual applications
• Led a team of 5 instructors teaching hands-on Arduino programming and C++ to middle school students, designing curriculum that introduced embedded systems and sensor integration
• Analyzed program effectiveness data and created reporting dashboards to track student engagement, retention, and learning outcomes
• Represented NYU at the USA Science & Engineering Festival 2018 in Washington, D.C., demonstrating student projects to 350,000+ festival attendees