Resume · Day One Devs

Jahamiel Douglas

Full-Stack Product Engineer

Workflow Systems · AI Safety · Document Automation · SaaS PlatformsRemote

I build full-stack software for complex workflows: AI-assisted products, document automation, transaction systems, and internal tools. My work focuses on explicit business rules, secure data boundaries, reliable state transitions, and interfaces that help users make high-consequence decisions with confidence.

ContactLinkedInGitHubView technical projects

For Hiring managers

I ship workflow-heavy product surfaces end-to-end — not just UI screens. Expect clear ownership of APIs, data boundaries, and verification.

For Founders / YC teams

I can join as a product engineer on a core workflow, stabilize a fragile MVP, or scope the first milestone for an AI or document-heavy product.

Core strengths

  • Full-stack product development (Next.js, TypeScript, Postgres/Supabase)
  • Workflow and state-machine design
  • AI orchestration with deterministic safety gates and evaluation tooling
  • Document automation and structured parsing
  • API, database, and authorization design (including RLS)
  • SaaS billing architecture, webhooks, and integration boundaries
  • Migration strategy and legacy-system modernization

Experience

Day One Devs

Full-Stack Product Engineer

2024 – Present

Built and stabilized full-stack applications for workflow-heavy products, including AI communication tools, municipal-finance software, document-review systems, and SaaS platforms.

  • –Contributed to AI-assisted workflows using deterministic safety gates, structured model outputs, persistent context, entitlement controls, and evaluation tooling.
  • –Built workflow and document-review systems involving state transitions, audit history, user confirmation, secure storage, and integration boundaries.
  • –Designed API, database, authorization, billing, webhook, and migration patterns for multi-step SaaS products.
  • –Refactored complex application areas into clearer modules, service layers, hooks, and typed contracts.
  • –Produced architecture notes, migration handoffs, testing plans, and technical documentation to preserve decisions and reduce future maintenance risk.

Selected projects

Technical proof for hiring and founder conversations. Status labels reflect what the repos and deployments support today.

Social Q

AI-Assisted Communication Analysis Platform

BuiltLive demo — auth required

What I contributed

  • –Multi-stage AI workflow combining deterministic routing, structured model output, analysis, interpretation, and send-strategy generation.
  • –Safety controls for ambiguity, unsupported relationship claims, message-direction errors, and hold / do-not-send recommendations.
  • –Anonymous-first identity flow with authenticated account migration, ownership scoping, and entitlement metering.
  • –AI evaluation tooling covering safety-specific failures, hold behavior, clarification quality, and hallucinated patterns.
TypeScriptNext.jsSupabaseOpenAIRLSRevenueCatEvaluation systems
Full case study

Muni Clerk

Deterministic Document Review for Municipal Bond Resolutions

BuiltPrivate case study

What I contributed

  • –Deterministic detection pipeline with ordered rules, validation, overlap resolution, stable grouping, and false-positive controls.
  • –Review-state model separating detected values, user-confirmed mappings, applied replacements, skipped occurrences, and version history.
  • –Editor-native DOCX workflow with canonical text mapping, validated editor ranges, and right-to-left transactional replacements.
  • –Secure read-only integration boundary for pulling authorized municipal term-sheet data into the review workflow.
TypeScriptNext.jsProseMirrorDOCXRule enginesSupabaseAPI contracts
Full case study

PRO-Muni / MuniFlow

Municipal Finance Workflow and Transaction Platform

Contributed / built core modulesPrivate case study

What I contributed

  • –Catalog-driven deal-context engine that maps transaction setup data into configurable overlays, active modules, and relevant term-sheet fields.
  • –Migration path from a legacy rules engine using compatibility views, adapters, synchronized derived state, and explicit legacy retirement.
  • –Secure authorization boundaries for deal membership, webhooks, scoped external access, and service-layer operations.
  • –Queue-first inbound email design, notification infrastructure, and CI foundations (including static security checks).
TypeScriptNext.jsPostgreSQLSupabaseRLSWebhooksFeature flagsCI
Full case study

Bond Generator

Municipal Bond Certificate Generation Workflow

BuiltLive demo — public

What I contributed

  • –Deterministic DOCX certificate assembly from templates, maturity schedules, and CUSIP data.
  • –Editable validation preview before generation, draft persistence, and streaming output for large series.
  • –Stripe subscription billing architecture with webhook-driven access control (feature-flagged; not claimed as active monetization).
TypeScriptNext.jsSupabaseStripeDOCXxlsxSentry
Full case study

Skills

Languages & Frameworks

TypeScriptJavaScriptReactNext.jsNode.js

Data & Auth

PostgreSQLSupabaseRLSZodSQL migrations

AI & Documents

OpenAI structured outputsDeterministic safety gatesEval harnessesProseMirrorDOCX pipelines

Delivery

VercelGitHub Actions / CIStripe webhooksSentryPlaywright / Vitest

Next step

Open to full-time product engineering roles and scoped founder engagements. Selected demos and case studies are available to review — ask for access where a project is private.

jah-amiel@muniflow.ioLinkedInGitHubSee how I work →