Hi, I'm

Jakob Neild.

Solutions engineer. 12 years owning products end-to-end. System design, data pipelines, DevOps, and production infrastructure.

TypeScriptReactNestJSNode.jsPostgreSQLDockerAWS
Jakob Neild

// about

End-to-End Ownership

I've shipped production systems across SaaS, gaming, education, and data intelligence, owning architecture, infrastructure, testing, and deployment at every stage. I've solo-shipped a multiplayer MMO, built ETL pipelines processing 120K+ federal records, and designed automation frameworks. I operate wherever the problem needs solving.

Currently a QA Engineer at Serasa Experian, defining test strategies for financial applications handling sensitive data. I've led product development for SaaS platforms, managed production infrastructure on AWS, and coordinated cross-functional teams.

I use AI tools daily to accelerate development: code generation, review, architecture planning, and test coverage analysis. I speak English natively, Portuguese professionally, and Spanish conversationally. Based in Brazil.

Architecture & Design
System DesignAPI DesignReal-Time SystemsData Modeling
Infrastructure & DevOps
DockerAWS EC2NginxCI/CDLinuxSSL/TLS
Data Engineering
PostgreSQLRedisPostGISPrismaETL Pipelines
Testing & Quality
CypressJestPlaywrightCucumber
Languages & Frameworks
TypeScriptPythonJavaReactNestJSNext.js

// projects

What I've Built

Stamp Collector Simulator

Live
stampcollectorsimulator.com

Solo-shipped a production multiplayer MMO, owning every layer: game design, system architecture, CI/CD, and production monitoring. Real-time state synchronization via SSE, distributed background job processing, and a 180+ card game engine with PvP, adversary AI, and prestige systems.

NestJSNext.jsTypeScriptPostgreSQLRedisDockerAWS
  • Solo-owned full product and deployment lifecycle
  • Real-time SSE with distributed resolver engine
  • Dockerized infrastructure with Nginx reverse proxy on AWS
  • JWT + OAuth, rate limiting, Helmet.js security hardening

English by Jake

Live
englishbyjake.com

Solo-built a full-featured ESL platform for Brazilian learners with adaptive placement testing, 6 interactive exercise types, gamification with XP and streaks, and Stripe payments supporting PIX, Boleto, and cards. 26 pages, 50 components, 23 API routes, and a Portuguese-localized interface.

Next.jsTypeScriptPostgreSQLPrismaStripeNextAuthAWS
  • Full platform: auth, payments, learning modules, admin panel
  • Adaptive placement test that calibrates CEFR level
  • Stripe with PIX + Boleto Bancário for Brazilian payments
  • PT-BR localization with 370+ translation keys

Elder Care Data Intelligence

In Development

Designed a data platform to surface high-value B2B sales opportunities from fragmented federal datasets. Aggregates ~120K elder care facilities from 5 sources, deduplicates with multi-tier fuzzy matching, geocodes with spatial query support, and scores leads using CMS staffing and financial signals.

PythonPostgreSQLPostGISDocker
  • End-to-end pipeline: ingestion → dedup → geocoding → scoring
  • 5-tier deduplication (exact, fuzzy, Jaro-Winkler)
  • Weighted lead scoring with portfolio & staffing analysis
  • Census Bureau + Nominatim geocoding pipeline

Castle Smash

Completed

Co-led development of a multiplayer Roblox PvP game over 370+ combined hours, managing the full production pipeline: task planning, team coordination, weekly standups, and asset creation alongside client-server game architecture.

LuaRoblox StudioGIMP
  • Managed full production pipeline across 2-month sprint
  • Client-server architecture with real-time multiplayer
  • Hundreds of custom rasterized game assets
  • Team coordination: task tracking, standups, personnel management

Pixel Grid

Completed

Built and deployed an MVP in under 12 hours: requirements, design, implementation, and deployment. Pixel-based advertising grid inspired by the Million Dollar Homepage with dynamic cell claiming and automatic image processing.

Next.jsSupabaseVercel
  • Concept to deployed MVP in under 12 hours
  • Full ownership: requirements → design → ship
  • Image upload with automatic crop and resize
  • Mobile-responsive design

Browser Automation Framework

In Development

Extensible automation framework with a plugin architecture for multi-site adapters. Configurable behavior profiles with session persistence, proxy rotation, and structured logging.

TypeScriptNode.jsPlaywrightYAML
  • Plugin-based adapter architecture
  • Configurable persona/behavior profiles
  • Session persistence & proxy rotation
  • Winston structured logging

Job Market Automation

Active Use

Aggregation tool that collects listings from 5 job platforms in parallel, deduplicates results, and produces scored/ranked reports based on configurable profile matching.

PythonPlaywrightBeautifulSoup
  • 5 platform adapters with parallel execution
  • YAML-driven profile matching & scoring
  • Automated deduplication pipeline
  • Report generation with ranked output

// experience

Where I've Worked

QA Engineer

Serasa Experian
2025 - Present

Defining and executing end-to-end test automation strategy for internal financial applications. Architecting test suites across modern frameworks and legacy Java/AngularJS systems, validating data integrity flows for sensitive financial data at scale. Working fully in Portuguese.

Software Developer & Technical Lead

Acceptable Dev Tech
2023 - 2025

Led product development for a video-based SaaS platform. Owned technical architecture decisions, managed the development roadmap, and coordinated across design and engineering to deliver production releases. Separately managed a 3-month SaaS project for a São Paulo-based client.

Founding Partner

Couples English Education
2023 - 2025

Co-founded a language education company serving professionals in Brazil. Built and maintained the full technology platform while managing curriculum, client relationships, and business operations.

Chief Operations Manager

DJ Event Solutions
2017 - 2023

Grew revenue 20% annually through sales funnel optimization. Coordinated 160+ events, recruited and managed high-performing teams, and owned end-to-end operational delivery.

Web Developer

Theramin
2015 - 2017

Built modular web applications with React and Bootstrap. Implemented authentication, security controls, and responsive interfaces. Company tripled in size during tenure.

Freelance Web Developer

Self-Employed
2014 - 2015

Delivered front-end development, graphic design, and video editing for 8+ clients across 2 states using React, Bootstrap, and WordPress.

// contact

Let's Work Together

Looking for someone who owns problems end-to-end? I'm available for full-time remote roles and contract work.

LinkedIn