Systems & Infrastructure Engineer

Miguel Esteves

Systems-oriented engineer across Python, SQL, and Linux — concurrent systems, REST APIs, and security automation, backed by 10+ years navigating Linux environments and a defensive, secure-by-design habit from security research work. Multilingual and remote-native.

SupportEscalationTriageBackendApplication SecurityLLMOps

Summon Descend

The Record

Professional experience, most recent first.

Software Engineer

2026 — Present

DataAnnotation — Remote Contract

Systematically stress-test agentic LLM coding runtimes against real-world open-source codebases, surfacing logic, instruction-following, and verification failures in production-grade code.
Operate Linux CLI-based agent environments (tmux, git, pytest) to reproduce, capture, and log failure conditions for structured technical review — daily terminal-driven diagnostic work.
Design targeted test scenarios spanning ambiguity categories — underspecified requirements, technical impossibilities, contextual ambiguity, and conflicting constraints — to systematically elicit and document model failures.

Full-Stack Developer / SysAdmin

2022 — Present

KW Reserve — Winter Garden, FL — Remote, Part-Time

Architect and maintain technical infrastructure, web architecture, and production database organization for a real estate brokerage's digital operations.
Design and deploy automated cold-outreach systems integrating third-party APIs (Google, Groq, Gemini) to accelerate lead generation.
Implement secure, token-based authentication and role-based access control (RBAC) across internal applications.

The Arsenal

Core competencies, layered from language to security.

Backend Languages

GoPythonJavaScript / TypeScript

Linux

10+ yearsArch, Debian, FedoraCustom Arch repositoriesProduction terminal work

III

Python & Frameworks

FastAPIFlaskScripting & automationREST API designCryptographyCLI tooling

Data & Infrastructure

PostgreSQLSupabaseDockerGitGitHub Actions

Security

OWASP Top 10PortSwigger Web Security AcademyAuth & access control

AI Tooling & Evaluation

Claude CodeGemini CLICodextmuxSystematic failure-mode analysis

The Forge

Technical projects, built and shipped.

Concurrent Port Scanner

Go — Solo-written

A multi-threaded TCP port scanner using goroutines and WaitGroups, with a configurable worker pool and timeout handling — written independent of AI tooling to internalize Go's concurrency primitives.

AES-GCM Encryption CLI/Server

Go — Solo-written

A symmetric encryption/decryption tool (CLI + HTTP server) built from the cryptographic primitives up, plus a hand-rolled REST API/HTTP server to internalize routing and middleware before adopting a framework.

III

Hacklingo

Full-Stack Developer

A gamified cybersecurity learning platform with RPG-style progress tracking across Red, Blue, and Purple team curricula. Backend API and relational data models in Supabase/PostgreSQL, applying OWASP Top 10-aligned validation and hardening.

Achlys Runtime Environment

Creator & Systems Designer

A custom systems-level runtime with a hand-built tokenizer, AST evaluator, and interpreter, designed to study parser mechanics and low-level execution models.

Education

Southern New Hampshire University

Computer Science coursework (2 years)

University of Helsinki — Python MOOC

In progress — pursuing certification from an accredited university program

Languages

EnglishFluent
SpanishFluent
ItalianFluent
NeapolitanIntermediate
PortugueseIntermediate
CatalanIntermediate

The Rite

Open to remote roles and contract work across time zones.