Subhav Mathur

Selected work

All products below are mine and early-stage. No fake client logos—just live code, architecture and run logs.

• Lumora

  ◆MVP

  Small businesses in India lose leads to missed calls and slow follow-ups. Owners don't have time to learn another tool.

  • Cloudflare WorkersRuns the provider-neutral voice-ops runtime, so the telephony vendor can change without rewriting the agent.
  • D1Stores HMAC API key digests and idempotent call admission records.
  • ClerkHandles business-owner sign-in; scoped, revocable API keys are minted per account.
  • ZodValidates the versioned API payloads at every boundary.
  • TypeScriptShared types across the Workers runtime and the business dashboard.

  Read case study →

• Teamora

  ◐Building

  Coding agents are fast but they hang, loop, take credit for each other's work and leave half-finished runs writing to the repo.

  • TypeScriptTypes the agent contracts so Chief-of-Staff, reviewers and implementers share one schema.
  • Node.jsRuns the local-first agent orchestrator and its run logger.
  • PostgreSQL 16Stores project state, task history and the run logs work is credited from.
  • GitHub ActionsCI runs on every agent-produced branch before the human merge gate.

  Read case study →

• NamasteParent

  ●Live, in development

  Families living away from aging parents worry every day, and parents don't want to learn a new app—they just want to answer a phone call.

  • Gemini 3.1 Flash LiveLive bidirectional audio so parents just talk on a normal phone call.
  • Piopiy/TeleCMIPSTN telephony, so parents answer a regular call — no app needed.
  • FastAPIPython service that brokers call audio and check-in logic between telephony and Gemini Live.
  • Next.jsFamily dashboard for updates and consent settings.
  • SupabaseJWT + row-level security so each family only sees its own check-ins.
  • Cloud RunHosts the FastAPI voice service, scaling to zero between calls.

  Read case study →

• CivicFlow

  ★Open source

  Public benefit portals bury applicants in complex forms, while brittle screen-scraping bots break or submit wrong data without human approval.

  • TypeScriptTyped tool contracts shared by the portal and the browser agent.
  • WebMCPThe signed-in tab is the WebMCP server — the agent and the person share visible state.
  • ZodSchema-validates all 10 tools' inputs before any state changes.
  • MITMIT-licensed so anyone can audit, fork or reuse the portal.

  Read case study →

Lab

Small experiments and tools — including the interactive voice demo that used to sit on this page.

• Voice agent / InteractiveOct 2026

  Smile Studio voice-agent demo

  The scripted bilingual receptionist console from the Lumora build — talk, type or play the 28-second sample call and watch the intent/policy/tool/receipt telemetry fill in. Honest demo: no real bookings or data stored.

  • Try it in the Lumora case study →
• Grok Bot / Multi-AgentOct 2026

  Fleet Interviewer

  A Grok Bot that interviews you about your stage and spins up a dedicated bot team (Chief of Staff → Engineering Manager) where each bot has one job.

  • Read the X post ↗(opens in a new tab)
• WebMCP / TypeScriptOct 2026

  WebMCP Browser-Tab Contract Demo

  Why screenshot-and-click was a workaround: exposing typed tools directly inside the browser tab you're already signed into.

  • Read the X post ↗(opens in a new tab)
  • CivicFlow case study →

Writing

A dated build log. The models are fine — the plumbing around them is where the time goes.

1. 2026-10-22

   I almost removed my plan reviewer

   How a pre-code review agent caught 6 serious issues, including a bug that would have silently wiped a to-do list of owed fixes.

2. 2026-10-19

   What went wrong with my agents: 6 lessons from their logs

   45-minute hangs, 13-round review loops capped down to 4, leftover background processes, and why the plumbing around the models is where the time goes.

3. 2026-10-08

   The voice agent is the commodity

   Why the real product isn't the voice stream—it's capturing intent, taking action, following up, and updating the business.

4. 2026-09-29

   Intent, policy, tools, receipts

   A four-layer mental model for shipping agents that never put production one bad tool call away.

About

Healthcare backends by day, voice agents and agent teams by night.

4+ years building Java/Spring Boot healthcare backends at a large US health-tech company: access controls, PHI/PII-safe logging, eligibility rules, CI/CD. Now I design the architecture for AI products, run teams of coding agents and review every change. Agents can open PRs; only I merge.

• 4+ yrs healthcare backends↗Java/Spring Boot backends at a large US health-tech company [CONFIRM: OK to name]: access controls, PHI/PII-safe logging, CI/CD/about
• 200+ merged PRs in a year↗200+ merged PRs across 10 production repositories in 12 months/about
• Open source: CivicFlow↗(opens in a new tab)MIT-licensed WebMCP public-benefits portal with 10 typed, schema-validated toolsgithub.com
• Devin Max winner, Oct 2026↗(opens in a new tab)Awarded a free month of Devin Max by @markfenner / @cognition, Oct 2026x.com

What builders said

Work with me

Alongside my own products I take on a small number of fixed-scope builds — voice agents, AI automations and SaaS MVPs. Written scope in 48 hours, weekly staging demos.