Gunjan Sharma

Fractional & Advisory

Consulting

I take on a limited number of engineering engagements each quarter. If you're building a system that needs to be secure, reliable, and production-grade— not just functional — let's talk.

What I work on

Highest demand · Rarest skill

Security Engineering & Cryptography

End-to-end security design and review for production software systems. Grounded in real-world R&D — not checkbox compliance. I work at the intersection of applied cryptography, secure system architecture, and adversarial thinking.

  • Threat modelling and attack surface analysis (STRIDE, PASTA)
  • Zero-trust architecture design and implementation
  • Cryptographic protocol selection, design and code audit (AES-GCM, RSA-OAEP, ECDSA, Ed25519)
  • PKI, certificate lifecycle management and secrets management (Vault, AWS KMS, GCP Secret Manager)
  • OWASP Top-10 remediation and secure SDLC embedding
  • SOC 2 / ISO 27001 technical control implementation
  • Security review for digital asset custody and on-chain transaction flows

System Design

Software Architecture & Technical Design

From product requirements to production-ready technical blueprints. I translate PRDs into database schemas, define class and service boundaries, and design inter-service communication patterns that survive real traffic.

  • PRD → technical specification and schema design
  • Microservice boundary definition and API contracts
  • Event-driven and queue-based communication design
  • Database selection and schema optimisation
  • Technical due diligence for founders and VCs

Web3 & DeFi

Blockchain & Decentralised Systems

Production-grade development on XRP Ledger, Ethereum, and IPFS. Not prototypes — systems that process real transactions at scale. Deep experience in FinTech and digital asset platforms.

  • XRP Ledger (XRPL) integration and transaction design
  • Ethereum smart contract development and auditing
  • IPFS-based decentralised storage architecture
  • Digital asset custody and wallet infrastructure
  • On-chain/off-chain system design for ₹100CR+ transaction volumes

Infrastructure

Cloud Infrastructure & Cost Optimisation

Deploy and operate services on AWS and GCP with a balance of reliability, performance, and cost efficiency. Built and managed cloud infrastructure for production platforms serving millions of operations.

  • AWS / GCP service selection and architecture
  • Cloud cost auditing and rightsizing
  • CI/CD pipelines and deployment automation
  • Observability: logging, metrics, and alerting stacks
  • Kubernetes and containerised service design

Why it matters to work with someone who has done it

  • Engineering Lead (B2C) at AltDRX — security, cryptography, and distributed systems R&D
  • Designed systems handling ₹100CR+ in on-chain digital asset transactions
  • Production engineering across XRPL, Ethereum, and IPFS at scale
  • AWS & GCP Certified · 8× Published Technical Author
  • Open Source Builder — practical systems, not toy projects

How I engage

1–2 sessions

Architecture Review

One or two focused sessions to review your system design, identify risks, and provide a written technical assessment.

Monthly engagement

Fractional Engineering

Embedded part-time on your team for a defined period. Ideal for critical technical problems, security hardening, or blockchain integration.

Retainer

Technical Advisory

Ongoing access for design reviews, second opinions on critical decisions, and escalation during incidents.

Limited availability

Let's build something reliable

I work with a small number of teams at a time to ensure genuine depth and focus. If your timeline fits and the problem is interesting, reach out.

Get in touch →