Vicky Kumar
Backend & Distributed Systems Engineer
Skills
Core stack: Rust, Axum, Tokio, Node.js, TypeScript, PostgreSQL, Redis, REST APIs, WebSockets, microservices, event-driven architecture, message queues, multi-tenant SaaS, RBAC, Docker, Kubernetes, AWS (EKS), Terraform, CI/CD, OpenTelemetry, distributed systems, concurrency, LangGraph, LangChain, RAG, agentic AI, human-in-the-loop, LLM tool integration, enterprise agent orchestration
Knowledge-Based
- Rust (Axum/Tokio): Built high-performance, concurrent backend services; P99 latency 800ms → 120ms on inventory-locking under load.
- PostgreSQL & data modeling: Multi-tenant ledger with transactions, indexing, RLS/RBAC — 10K+ daily transactions across 5+ facilities.
- Distributed systems: Event-driven async pipelines (Redis queues/pub/sub); decoupled 5K+ daily jobs from API request paths.
- API design: 40+ versioned REST endpoints — cursor pagination, idempotent writes, RFC 7807 errors, third-party integrations.
- Cloud & DevOps: AWS EKS, Docker, Kubernetes, Terraform, CI/CD; deploy cycle 45 min → 8 min; production observability.
- Agentic AI (LangGraph): Built production-style agent workflows (RAG, tool calling, HITL); Google Cloud Agentic AI Hackathon Finalist (2025).
Personal Traits
- Ownership: Founding backend engineer — owned API design, data model, observability, and production releases end to end.
- Critical thinking: Chose transactional boundaries and idempotent APIs before scaling warehouse throughput.
- Calm under production pressure: Used tracing and structured logs to cut incident diagnosis from hours to minutes.
Transferable
- Systems analysis: Profiled queries and backend paths to prioritize the Rust migration with measurable latency gains.
- Technical communication: Defined REST contracts (40+ endpoints, RFC 7807 errors) used by frontend and partner integrations.
- Execution across contexts: Delivered 8+ freelance backends, then applied the same delivery discipline to enterprise WMS scale.
Professional Experience
CodeApto India
Aug 2023 – Present
Founding Engineer
Bengaluru, India
- Architected scalable, multi-tenant WMS backend (Rust/Axum/Tokio) for 5+ facilities — 10K+ daily inventory transactions with transactional PostgreSQL and data integrity guarantees.
- Migrated performance-critical paths from Node.js to Rust; eliminated race conditions and cut P99 latency from 800ms to 120ms under concurrent warehouse load.
- Enforced tenant isolation with PostgreSQL RLS, scoped RBAC, and API authorization across all read/write paths.
- Built event-driven background processing with Redis queues and pub/sub (5K+ daily jobs) for reliable async workflows.
- Shipped real-time WebSocket sync for operational dashboards; maintained low-latency reads under batch traffic.
- Designed and documented 40+ REST APIs with pagination, idempotent writes, validation, and predictable error contracts.
- Owned cloud-native releases on AWS EKS (Docker, Kubernetes, Terraform, CI/CD) with OpenTelemetry tracing and structured logging.
Independent Consultant
Jan 2020 – Aug 2023
Backend / Full Stack Developer
Remote
- Delivered Node.js/TypeScript backends and MongoDB data models for early-stage startup products end to end.
- Built auth, REST APIs, and admin CRUD flows used daily by operations and support teams.
- Designed schemas and API contracts that kept frontend teams unblocked on fast-moving releases.
Selected Projects
Rust Multi-Tenant Backend
Distributed multi-tenant APIs with RBAC, async job orchestration, and Redis-backed service decoupling.
Warehouse Management System
Microservice-style inventory platform in Rust — PostgreSQL, Redis caching/queues, WebSockets, AWS EKS.
Inventory Locking & Concurrency Layer (Rust)
Rewrote critical stock reservation logic in Rust with transactional guarantees and load-tested concurrent updates.
Education
BRABU University — B.A., Psychology & Economics
Awards & Recognition
- Google Cloud Agentic AI Hackathon Finalist (2025)
- AI Agents Hackathon — Lyzr AI / Airtribe (2025)