Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Full-stack software engineer who owns production systems end-to-end and authors open-source “guardrail layer” verification (Claude-harness). Builds high-throughput admin consoles, backend APIs, and payment stacks (including anti-double-charge and concurrency-safe flows), while also integrating AI coding agent evaluation and tooling.…

John Ross Rivera

Full Stack Developer, Software Engineer, AI Engineer, +3





Full-stack software engineer who owns production systems end-to-end and authors open-source “guardrail layer” verification (Claude-harness). Builds high-throughput admin consoles, backend APIs, and payment stacks (including anti-double-charge and concurrency-safe flows), while also integrating AI coding agent evaluation and tooling.…

Available to hire

Full-stack software engineer who owns production systems end-to-end and authors open-source “guardrail layer” verification (Claude-harness). Builds high-throughput admin consoles, backend APIs, and payment stacks (including anti-double-charge and concurrency-safe flows), while also integrating AI coding agent evaluation and tooling.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Software Engineer (AI-assisted logistics site builder) at R R R Remo Trucking

May 1, 2026 - June 30, 2026

Built an AI-assisted logistics website (Next.js/React, Groq/LLaMA 3.1) to automate customer support and lead capture, improving inquiry handling and sales funnel creation.

Software Engineer (Full Stack, Freelance) at RRR Remotrucking

May 1, 2026 - June 30, 2026

Built an AI-assisted logistics site that automates customer support and lead capture using Next.js/React and Groq/LLaMA 3.1.

Full-Stack Software Engineer at Crystal Vision - Software Engineer

August 1, 2025 - Present

Built and maintained a full competition lifecycle platform enabling operations staff to run judging, moderation, payments, and analytics without engineering involvement. Owned the admin console (34 modules, 47 pages; Next.js/React) and developed backend powering both admin console and the mobile app (37 modules, 200+ REST endpoints, 61 data models; NestJS). Implemented cryptography and fiat entry payments without double-charging by integrating two payment rails (USDC on Polygon + Xendit). Protected result integrity against vote manipulation and race conditions under load with a concurrency-safe voting engine (per-user and per-IP rate limiting). Added business self-serve visibility via 9+ analytics dashboards with CSV exports. Improved team-wide review and debugging time using in-house Claude Code agent guardrails (8 sub-agents, secret scanning and pre-commit guardrails), open-sourced and generalized from internal tooling; covered ~5,400 LOC.

Full-Stack Software Engineer at Rola Competition Platform

August 1, 2025 - Present

Let operations staff run the full competition lifecycle (judging, moderation, payments, analytics) without engineering involvement. Built admin console and backend powering both the admin console and the mobile app: multiple modules, a large REST API surface, and core data models. Enabled crypto and fiat entry payments without double-charging, integrating payment rails across networks. Implemented protections for content/result integrity against vote manipulation and race conditions under load via a concurrency-safe voting engine with per-user and per-IP rate limiting. Delivered business self-serve visibility through analytics dashboards with CSV export. Reduced team-wide review/debug time using an in-house Claude Code agent harness with secret scanning and pre-commit guardrails (open-sourced).