# Vinicius Pereira - Senior Backend Engineer

**Purpose:** Tier 2/3-targeted, one-page resume. Lead with metrics, specialize on Rails + PostgreSQL at scale.

**Senior Backend Engineer · Ruby on Rails · PostgreSQL at Scale**
Remote-first · async-first · vini.felpe@gmail.com · [linkedin.com/in/atomosdovini](https://www.linkedin.com/in/atomosdovini/) · [github.com/atomosdovini](https://github.com/atomosdovini)

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## Summary

Senior Backend Engineer with 6 years specialized in Ruby on Rails and PostgreSQL at scale, with a financial-grade correctness mindset. Currently a core engineer in a 2-person team keeping a 15-year-old Rails monolith running for 200K+ traders at Tradervue. Designed idempotent ingestion pipelines, tuned billion-row tables, and helped grow MRR. I work best in small, high-ownership teams where correctness is non-negotiable. Backend specialist by depth, product engineer by instinct - Linux-native, self-taught, AI-native since GPT-3 (2022).

## How I Work

- **Product engineer mindset** - shipped multiple 0→1 products end-to-end; comfortable owning a feature schema → API → UI.
- **AI-native since 2022** - early GPT-3 adopter; LLMs in production and in the daily dev loop as leverage.
- **Linux-native, self-taught** - daily-driver Linux; 6+ years in production at scale.

## Side Builds

AI-powered products I build on my free time, end-to-end: **Annotator** (browser YOLO annotation + training), **VisionOps AI** (computer vision for inspections & compliance), **AtomicML** (didactic ML library in Ruby), **Shape4M** (personalized workout planner, Rails), **Ovini** (bilingual personal site, Next.js).

## Specializations

- **Rails monolith modernization** - evolve long-lived codebases in small, reversible steps; zero-downtime delivery.
- **PostgreSQL performance at scale** - EXPLAIN-driven tuning, batched updates, indexing on 2.5B+ row tables without production locks.
- **High-integrity financial systems** - idempotency, at-least-once processing, reconciliation across heterogeneous APIs.

## Core Stack

Ruby on Rails · PostgreSQL · Redis · Sidekiq · AWS (EC2, RDS, S3) · Docker · Kubernetes · CI/CD · RSpec/TDD · Hotwire / React (comfortable with)

## Experience

**Tradervue (SureSwift Capital)** - *Senior Software Engineer · Core engineer, 2-person team* - Jun 2023 – Present
- Kept a 15-year-old Rails monolith reliable for **200K+ users** while delivering features with zero downtime.
- Designed at-least-once ingestion pipelines with Redis-backed queues, natural-key idempotency, and reconciliation across heterogeneous broker APIs.
- Tuned PostgreSQL tables with **2.5B+ rows** - **15% performance gain, no production locks** - via EXPLAIN analysis, indexing, and batched updates.
- Led modularization of the monolith, introducing domain boundaries that enabled zero-downtime feature delivery.
- Contributed to MRR growth.

**Abler (HR Tech)** - *Lead Full-Stack Developer* - Oct 2022 – May 2023
- Decoupled heavy operations from request cycles via async pipelines - reduced peak-load latency for an **8M+ user** platform.
- Led production stabilization: retry strategies and monitoring that cut recurring background job failures.

**Informatech (Arqcen)** - *Senior Software Engineer* - Apr 2022 – Dec 2022
- Architected Sidekiq/Redis pipelines isolating failures in large-scale document batch operations.
- Introduced data-driven monitoring to eliminate production bottlenecks.

**Nodau Digital** - *Co-Founder & Software Architect* - Aug 2020 – Nov 2022
- Designed backend systems for financial platforms and payment infrastructure with fault isolation and idempotent job processing.
- Delivered full-stack applications for **20+ clients**, owning Figma → containerized deployment.

## Education

- B.Sc. in Chemistry - UDESC (2016 – 2020). Co-authored peer-reviewed publications in *EurJOC* and *Tetrahedron Letters*.
- Software Engineering (Additional Studies) - Ampli (2020 – 2021).
- Technical Degree in Electronics - SENAI/SC (2013 – 2015).