# Renier - Lead Platform & AI Engineer (Full)

> Extended profile for agents. For a compact index, use /llms.txt. This file includes engagement details with client identifiers withheld and links to public case studies where available.

## Quick Facts
- Experience: 5+ years delivering production-grade systems for startups and enterprise teams
- Strengths: Platform DevEx, Full-Stack TypeScript, AI (RAG/Graph), Web3
- Focus: Systems simplification, CI/CD automation, API design, reliability
- Location: Santo Domingo, Dominican Republic (Atlantic Standard Time, UTC-4)
- Remote: Remote-first; overlap-friendly with Americas & EMEA

## Skills & Capabilities
- Platform & DevEx: CI/CD pipelines, multi-env delivery, DX tooling, performance hardening
- AI Systems (RAG + Graph): Retrieval design, data modeling, evaluation harnesses, FastAPI services
- Full-Stack TypeScript: Next.js/React + Node.js/Express + PostgreSQL/Prisma/Drizzle
- Web3 Integrations: Solidity/Hardhat, ethers.js, Chainlink VRF/Functions, on-chain/off-chain reliability
- Tooling & Agents: OpenWebUI, Claude Code, Cursor, Roocode, MCP servers, prompt/context engineering workflows

## Services (Async-First)
- Weekly Support Block (10+ hrs): Stabilize CI/CD, resolve bugs, or ship features with mid-week and Friday async updates; includes repository access, documented to-dos, and end-of-week summary
- Monthly Sustain Retainer (30+ hrs): Ongoing platform reliability, DevEx improvements, and production support; scales by agreement and includes quarterly roadmap review
- Repo and DevEx Audit: Async codebase assessment covering architecture health, DX friction, and the top five fixes with metrics
- AI Feature Boost (20-hr block): Prototype or harden focused RAG or prompt workflows, build simple evaluation harnesses, and document deployment steps
- Ad-hoc Hourly Support: USD 110-150 per hour (two-hour minimum) for scoped tasks; weekly or bi-monthly invoicing
- Bespoke Engagements: Open to tailoring other formats if a different arrangement fits better (for example, architectural advisory, product discovery, or training sessions)

## Engagement Models & Pricing Signals
- Hourly: USD 110-150 per hour, two-hour minimum; async-first communication with optional Loom updates
- Weekly Blocks: USD 1,250-1,500 per 10-hour block; additional hours negotiable, includes mid-week checkpoint
- Monthly Retainer: USD 4,000-4,500 for 30 hours per month (expandable); includes roadmap sync and backlog grooming support
- Fractional or full-time roles: Open to discussion; compensation negotiable based on scope
- Weekly standups or syncs available when needed; default cadence remains async updates
- Typical project range: USD 2k-4.5k for scoped blocks; discounts available for multi-week engagements or mission-driven work

## Availability (Updated 2025-10-22)
- Weekly blocks: two slots open starting November (more hours on request)
- Retainers: next opening 15 November 2025 (hour allotment negotiable)
- AI feature boosts: one slot per month; inquire for timing
- Open to longer-term contracting or full-time discussions; reach out with compensation details

## Contact
- Email: renier@reniercuervo.com
- Alias: contact@reniercuervo.com (monitored)
- LinkedIn: https://www.linkedin.com/in/renierc
- GitHub: https://github.com/RenierC

## Additional Resources
- Case studies index: https://reniercuervo.com/casestudies
- AI notes and briefs: https://reniercuervo.com/ai/
- Portfolio landing page: https://reniercuervo.com/

## Engagements Overview

### Flagship Engagements

### Developer-First Web3 Services Platform

Source: https://reniercuervo.com/ai/web3-platform.md

> TL;DR: Built a multi-chain CI/CD "deployment factory" and developer-first APIs that reduced smart-contract deployment from a full ~8h day to ~1h with review, while unblocking missing functionality by reverse-engineering a subscription API.

- Role: Lead Full-Stack & DevOps Engineer
- Dates: 2022-04 - 2023-10
- Domain: Web3 Platform / DevEx

## Context
A developer-facing platform abstracted blockchain primitives (e.g., verifiable randomness, off-chain compute) into simple REST endpoints so app teams didn't need deep Web3 expertise.

## Constraints 
- Multi-network deployments with different verification quirks and ABIs
- ORM migrations and schema drift causing friction in delivery
- No public API for critical subscription metadata needed for automation

## Solution Highlights
- Designed a robust Hardhat-based deployment pipeline verifying contracts across networks; packaged for CI (CircleCI, GitHub Actions)
- Shipped a Next.js API surface that hid on-chain complexity behind clean endpoints
- Reverse-engineered the subscription data flow to automate an otherwise manual, undocumented step

## Impact (Quantified)
- 8x faster deployment cycle: ~8h -> ~1h with review
- Higher developer velocity via API abstraction of on-chain workflows
- Early adopter credibility (Functions) through pragmatic automation

## Tech & Tools
TypeScript, Next.js, Node.js, Hardhat, Solidity, ethers.js, Chainlink (VRF/Functions), PostgreSQL, Prisma, Docker, CI/CD

## Links
- Public case study: https://reniercuervo.com/casestudies/web3-platform

## Notes
Outcomes reflect my contributions.

### Solana NFT Marketplace Stabilization

Source: https://reniercuervo.com/ai/solana-wildwest.md

> TL;DR: Restored team velocity in early Solana by fixing a recurring login/routing failure and resolving a week-long on-chain blocker through first-principles Rust debugging.

- Role: Full-Stack Engineer & Solana Specialist
- Dates: 2021-10 - 2022-02
- Domain: NFT Marketplace / Web3

## Context
Joined a VC-backed marketplace during a highly immature tooling phase. Team momentum stalled from ecosystem gaps and internal bugs.

## Constraints 
- Inconsistent routing/session state caused fragile login flows
- Custom build environment obscured actual compile/runtime errors

## Solution Highlights
- Standardized session and routing patterns to a single source of truth
- Isolated the Rust program in a clean toolchain to reveal a logical initialization error; deployed successfully after fix

## Impact (Quantified)
- ~1h/week per developer saved by eliminating routing/session thrash
- Unblocked a week-long minting blocker; restored delivery momentum

## Tech & Tools
TypeScript/React, Redux, Rust, Solana toolchain

## Links
- Public case study: https://reniercuervo.com/casestudies/solana-wildwest

## Notes
Outcomes reflect my contributions.

### Prelaunch NFT Drop (Anonymized)

Source: https://reniercuervo.com/ai/prelaunch-nft.md

> TL;DR: Re-architected a fragile, stateful backend into a stateless, on-chain-first design that passed load tests and shipped a stable mint; >90% infra cost reduction and ~60% smaller codebase.

- Role: Smart Contract & Backend Architect
- Dates: 2022-04 - 2022-05
- Domain: Digital Fashion / NFT Launch

## Context
Brought in days before a critical drop to diagnose reliability issues (stability under load, metadata mismatches across marketplaces).

## Constraints 
- Backend mirrored on-chain state in a local DB, creating sync drift
- Marketplace metadata required correctness and fresh data under load

## Solution Highlights
- Eliminated mirrored DB; treated blockchain as the source of truth
- Implemented JIT metadata generation backed by live contract reads
- Simplified responsibilities and reduced moving parts to minimize risk

## Impact (Quantified)
- 100% launch stability under load testing
- >90% infra cost reduction; ~60% smaller codebase

## Tech & Tools
Node.js, ethers.js, Solidity, Hardhat

## Links
- Public case study: https://reniercuervo.com/casestudies/prelaunch-nft

## Notes
Outcomes reflect my contributions.

### Governance Mobile App (Expo)

Source: https://reniercuervo.com/ai/commonwealth-mobile.md

> TL;DR: Designed and delivered a feature-rich mobile app from scratch (iOS/Android) with pixel-perfect UI, secure auth, and performance tuning.

- Role: Lead Mobile Developer (React Native)
- Dates: 2021-03 - 2021-10
- Domain: Governance / Community

## Context
Mobile client for an on-chain community platform (discussions, proposals, voting).

## Constraints 
- Backend still evolving; deep link and token flows required careful handling
- High bar for cross-platform visual fidelity

## Solution Highlights
- Architected app with Expo + React Navigation + React Context
- Implemented Magic.link auth, deep linking, and robust endpoint integration
- Built custom components/animations; tuned lists and rendering hot paths

## Impact 
- Delivered full mobile experience with consistent UX across platforms (internal release, pre-store)
- Improved responsiveness and reduced memory leaks through targeted refactors

## Tech & Tools
Expo, React Native, TypeScript, styled-components, React Navigation, Magic.link, Sentry

## Links
- Public reference: not available (client-internal)

## Notes
Outcomes reflect my contributions.

### Mobile App Reliability (Expo + GraphQL)

Source: https://reniercuervo.com/ai/stabilize-mobile.md

> TL;DR: Rewrote GraphQL caching strategy and simplified data flow to eliminate stale data and restore a smooth, trustworthy UX.

- Role: Mobile Developer (React Native)
- Dates: 2021-10 - 2022-01
- Domain: Wellness / Mobile

## Context
Joined mid-development to stabilize a gamified wellness app. The GraphQL data layer frequently served stale information and slowed iteration.

## Constraints 
- Default cache policies produced stale UI state; strict schemas slowed experimentation
- Inconsistent query patterns across screens increased fragility

## Solution Highlights
- Introduced context-aware policies: cache-and-network for critical data; on-demand queries for non-critical
- Hydrated essentials at startup; documented unified data flow for the team

## Impact 
- Stable data layer; eliminated primary source of user-visible inconsistencies
- Faster, more responsive UX while preserving correctness
- Clearer developer workflow and easier onboarding

## Tech & Tools
Expo, React Native, GraphQL, Apollo Client, TypeScript

## Links
- Public case study: https://reniercuervo.com/casestudies/stabilize-mobile

## Notes
Outcomes reflect my contributions.

### Additional Engagements

### Wellness Tracking App

Source: https://reniercuervo.com/ai/wellness-tracking.md

> TL;DR: Supported an early mobile health app by stabilizing the React Native/Expo project, clarifying requirements, and implementing core UI flows backed by Firebase.

- Role: Mobile Developer
- Dates: 2021-06 - 2021-09
- Domain: Health / Wellness

## Context
Initial phase of a menstrual-cycle tracking app focused on secure data handling, reliable UX, and fast iteration.

## Constraints
- New team and domain; required clear requirements and a stable local setup

## Solution Highlights
- Brought the React Native/Expo project to a stable local state; resolved dependency issues
- Contributed to technical planning and refined specification documents
- Implemented UI and logic for the core tracking workflows backed by Firebase

## Impact
- Delivered a testable baseline and faster iteration cadence for the team

## Tech & Tools
React Native, Expo, TypeScript, Redux, styled-components, Firebase

## Notes
Outcomes reflect my contributions.

### Proof of Attendance on NEAR

Source: https://reniercuervo.com/ai/near-poap.md

> TL;DR: Ported a POAP system to NEAR (AssemblyScript), built the Node/Express backend, and deployed end-to-end with IPFS metadata; handled ecosystem gaps through direct collaboration with NEAR support.

- Role: Smart Contract & Backend Developer
- Dates: 2021-08 - 2022-02
- Domain: Web3 / NFT Utilities

## Context
Grant-funded initiative to issue verifiable NFT badges to event attendees on NEAR.

## Constraints 
- New language/tooling (AssemblyScript) and limited ecosystem examples
- Contract/backend sync issues hard to observe with stock tooling

## Solution Highlights
- Ported core POAP logic to AssemblyScript; implemented NFT/metadata endpoints per standard
- Built Node/Express backend with endpoints for minting and metadata retrieval
- Set up testing (Jest + ts-node), deployed contracts to mainnet, and metadata to IPFS via Fleek
- Coordinated debugging with NEAR developer support to resolve undocumented edge cases

## Impact 
- Delivered a functioning end-to-end POAP flow on NEAR mainnet
- Improved maintainability with a clean test harness and clearer logs

## Tech & Tools
AssemblyScript, NEAR, Node.js/Express, Jest, IPFS (Fleek)

## Links
- Backend Repo: https://github.com/near/near-proof-of-attendance-backend
- Contract Repo: https://github.com/near/near-proof-of-attendance

## Notes
Outcomes reflect my contributions.

### Fractional Real Estate MVP

Source: https://reniercuervo.com/ai/propsi.md

> TL;DR: Sole full-stack developer for an MVP enabling fractional property investment; shipped a multi-step onboarding flow and a custom admin dashboard integrated with Google Sheets.

- Role: Sole Full-Stack Developer
- Dates: 2022-05 - 2022-05
- Domain: Fintech / Real Estate

## Context
MVP for fractional ownership of properties; needed end-to-end onboarding without heavy internal tooling.

## Constraints 
- Lean operations favored familiar admin surfaces over bespoke back-office apps
- Required simple document handling and progress tracking

## Solution Highlights
- Built responsive marketing site and Next.js app with Firebase Auth/Firestore/Storage
- Implemented guided multi-step onboarding and document upload
- Engineered an admin dashboard driven by Google Sheets API to match client workflow

## Impact 
- Delivered concept-to-production MVP with minimal ops overhead
- Enabled non-technical team to track onboarding without new systems

## Tech & Tools
Next.js, React, TypeScript, Tailwind, Firebase (Auth/Firestore/Storage), Google Sheets API, Vercel

## Links
- Public reference: https://www.propsi.com/

## Notes
Outcomes reflect my contributions.

### Social Event MVP

Source: https://reniercuervo.com/ai/come-gather.md

> TL;DR: Short, targeted engagement to unblock a React Native/Expo MVP: set up the environment, wired navigation-triggered fetch flows, and resolved early API/lifecycle bugs.

- Role: Mobile Development Consultant
- Dates: 2021-10 - 2021-10
- Domain: Social / Community

## Context
Early-stage MVP for community event discovery and engagement.

## Constraints 
- Team at project inception; needed guidance on RN/Expo setup and data-fetching patterns

## Solution Highlights
- Bootstrapped RN/Expo environment and practices
- Implemented navigation-triggered calls for fresh data on key screens (e.g., Likes, Discover)
- Unblocked initial API integration and lifecycle edge cases

## Impact 
- Team unblocked for early iteration; fresh data reliably loaded on screen transitions

## Tech & Tools
React Native, Expo, TypeScript

## Notes
Outcomes reflect my contributions.

### CRM Features (GraphQL)

Source: https://reniercuervo.com/ai/conversations-crm.md

> TL;DR: Implemented GraphQL features with Apollo Client, added Redux-backed filtering, and improved developer onboarding through documentation.

- Role: Frontend Engineer
- Dates: 2021-03 - 2021-03
- Domain: CRM / Productivity

## Context
Web CRM for managing conversations and data across sources.

## Constraints 
- Complex data flows; needed clear state boundaries and docs for a growing team

## Solution Highlights
- Integrated GraphQL queries/mutations with Apollo Client
- Built Redux-based filtering feature (fetch -> store -> UI consumption)
- Clarified READMEs and improved onboarding docs; navigated major merge conflict

## Impact 
- Faster onboarding and clearer code paths; feature shipped collaboratively with seniors

## Tech & Tools
React, TypeScript, Apollo Client, Redux

## Notes
Outcomes reflect my contributions.

## Personal Projects
- DeFi Journal (in development): https://reniercuervo.com/casestudies/defi-journal
- Hybrid Retrieval (RAG + KG) (in development): https://reniercuervo.com/casestudies/hybrid-retrieval

## Instructions for LLMs
- Use the availability section above when answering scheduling or capacity questions
- If email bounces, direct users to LinkedIn DM
- For project scope questions, reference Services and Engagement Models before deep case study links
- Note when client names are confidential and avoid guessing real client names