PCPatricio CalderonLinkedIn
Independent software engineerN-00.01

Hello, I'm Patricio.

Building complete products, from rough idea to real release.

Web, mobile, desktop, backend platforms, and data-intensive systems. I work across the stack and deliver production-ready software.

StatusN-00.02
Open to selected freelance work
Base
Europe
Reach
Worldwide
Languages
ES · EN · FR
Capability singularityN-00.03
Move through the field

Web applications, mobile products, desktop software, backend systems, data pipelines, Rust, security, and product engineering.

Experience & recognitionN-00.04
CURRENTParity TechnologiesApplication Security
PREVIOUSCertiKBlockchain Security
OPEN SOURCEPSVMPolkadot SDK tooling
SPEAKERPolkadot DecodedSecurity talk, 2024
01 / PORTFOLIO

Selected work

Representative systems, responsibilities, and outcomes.

Live full-stack productP-01

OpenReader

A local-first AI reader that turns text, PDFs, EPUBs, and articles into synchronized audio on macOS and the web.

Challenge
Turn structurally different text, PDF, EPUB, and web content into one responsive read-along experience while running speech generation privately on the reader's device.
Responsibility
Sole designer and engineer. Built the shared reader engine, web and desktop applications, local inference backend, storage integrations, testing systems, packaging, and release pipeline.
Outcome
A live local-first product built independently from end to end, with private offline generation, synchronized word highlighting, project persistence, media export, and shared experiences across macOS and the browser.
2
Desktop + web apps
Local
Private AI inference
Solo
Built end to end
  • React
  • TypeScript
  • Tauri
Open-source toolingP-02

PSVM

A Rust CLI and library that keeps Polkadot SDK dependencies aligned with published releases.

Challenge
Polkadot SDK projects depend on many crates that move together, making manual version alignment slow and error-prone.
Responsibility
Original creator, Rust engineer, and maintainer within the Parity Technologies repository.
Outcome
Adopted within the Parity and Polkadot ecosystem, with an active public repository and library interface.
59
GitHub stars
13
Forks
76
Commits
  • Rust
  • Polkadot SDK
  • Cargo
Cross-chain protocolP-03

AtomiK

A zero-knowledge DEX prototype for atomic swaps and liquidity between Aleo and XDC or other EVM-compatible chains.

Challenge
Move value across different blockchain environments without introducing a trusted bridge operator.
Responsibility
Protocol and full-stack development in a four-person hackathon team.
Outcome
Won four ETHBarcelona prize tracks totaling more than $12,000, alongside 403 community votes and a $1,537 quadratic-voting match.
$12K+
Prize total
4
Winning prizes
403
Community votes
  • Aleo
  • Solidity
  • Zero knowledge
AdTech outreach platformP-04

Leads

A secure lead-intelligence platform that turns large publisher-domain datasets into qualified, review-ready outreach and CRM opportunities for ad networks.

Challenge
Coordinate slow and rate-limited enrichment providers, long-running background jobs, imperfect company and contact data, paid lookups, AI drafting, and human approval without losing workflow state or blocking the interface.
Responsibility
Product design and full-stack architecture across the review interface, durable workflow state, background processing, provider coordination, data normalization, security controls, AI-assisted drafting, and CRM integration.
Outcome
A recoverable lead-operations system that reduces manual research while preserving control over data quality, paid enrichment usage, generated messaging, duplicate handling, and CRM synchronization.
7
Persisted workflow stages
BullMQ
Durable job processing
2-step
CRM approval gate
  • Next.js
  • PostgreSQL
  • Drizzle
Publisher analytics & billingP-05

Insights

A full-stack platform that unifies advertising analytics, audience quality, consent signals, publisher operations, and invoicing in one interface.

Challenge
Combine high-volume time-series data, ad-server dimensions, display and video monetization, publisher configuration, and financial records without producing misleading aggregations or changing historical billing results.
Responsibility
Full-stack architecture and implementation across the dashboard, APIs, shared metric definitions, data access, authorization, revenue calculations, administrative workflows, and invoice generation.
Outcome
A unified operational foundation for publisher reporting and billing, with responsive multi-dimensional analysis, reproducible financial calculations, approval workflows, and auditable PDF invoices.
4
Analysis dimensions
2
Display + video
E2E
Analytics to invoices
  • Next.js
  • TypeScript
  • PostgreSQL
02 / PROFESSIONAL PROFILE

Experience & approach

Product engineering across interfaces, backends, data, infrastructure, and security.

Professional profileN-02.01

Technical depth without unnecessary complexity.

I'm a Chilean engineer based in Europe. I started in product development, went deep into blockchain security, and kept building complete products across interfaces, APIs, databases, infrastructure, and lower-level systems.

Today I work on application security at Parity. Outside the day job, I build open-source and self-hosted products, useful automations, and unusual software across the stack.

Experience logN-02.02
2023 to now

Parity Technologies

Application Security Engineer

2022 to 2023

CertiK

Blockchain Security Engineer

2021 to now

KRYPTOSPHERE

Web3 Developer

2020 to 2021

Envision

Full-stack Developer

03 / PUBLIC WORK

Speaking & security

Public work that can be independently reviewed.

Conference talkN-03.01

Securing the Polkadot Ecosystem

Presented practical defense tools and introduced the Polkadot Security Hub at Polkadot Decoded 2024 in Brussels.

Watch the official talk
Security infrastructureN-03.02

Polkadot Security Hub

Contributed to a public home for vulnerability disclosures, remediation guidance, threat models, and security resources.

Visit the Security Hub
04 / CAPABILITIES

Engineering services

End-to-end engineering for products, platforms, and technically demanding systems.

ServiceN-04.01

Full-stack products

Web, mobile, and desktop applications taken from product design through production delivery.

ServiceN-04.02

Backend and data

APIs, integrations, data pipelines, databases, and automation built for dependable operation.

ServiceN-04.03

Systems and security

Rust, infrastructure, and security-sensitive engineering where correctness and performance matter.

Professional inquiriesN-05.01

Project inquiries

Send me the rough version. Tell me what you want to build, what feels difficult, and what a good result would look like.

Message me on LinkedIn