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First Factory

Sergio T. logo

Sergio T.

Available now

Senior Software Engineer @ First Factory

Senior
Seniority
GMT-06:00, Heredia, Costa Rica
Location & Timezone
$65 - $80/hr
Average Hourly Rate
Spanish, English
Languages

Top skills

AWS
React Native
TypeScript
React.js
PostgreSQL

About

A seasoned Senior Engineer, Sergio channels the discipline and mentorship of a martial arts instructor into building scalable, high-quality systems. Partnering directly with executive leadership, he has defined product architectures for critical financial platforms. Sergio excels at solving complex data challenges, leading cross-functional teams, and authoring technical publications comparing enterprise-grade data solutions.

Top skills

Verified by Pangea.ai due diligence

Top SkillsCurrent UsageSeniority
AWS
20%6 years
React Native
20%6 years
TypeScript
20%6 years
React.js
20%6 years
PostgreSQL
20%5 years

All skills

Roles and tools, to bring ideas to life and create meaningful experiences

E-Commerce
AI & ML Solutions
Databases
API
Web Apps
Enterprise Software
CMS
Cloud Computing

Professional experience

Explore a curated selection of projects highlighting Sergio T.'s expertise and experience. Each project aims to showcase challenges, solutions, and the final outcome, along with the tools and technologies used.

QATI project preview
Qlok logo
Qlok
QATI — Senior Software Engineer
Architected backend services that enforce pre-execution guardrails, governing what actions AI agents are authorized to take. Designed an answer-verification layer that validates AI-generated responses against authoritative company documentation via search and audit trails. Owned database schema design, AWS cloud deployment, and CI/CD pipeline architecture across a multi-service platform. Led integration of third-party AI APIs, engineering robust error-handling and comprehensive automated test coverage. Leveraged AI-assisted development tooling to accelerate delivery without compromising code review rigor and testing standards. Translated technical requirements into implementation roadmaps, driving end-to-end delivery of platform features across backend services, data layer, and infrastructure. Built and maintained client SDKs in Python and TypeScript, streamlining third-party integration with platform APIs.
Web Apps
Enterprise Software
Architecture
Integrations
Business & Expert Solutions
+16

Sports Card Trading & Marketplace Platforms project preview
ALT logo
ALT
Sports Card Trading & Marketplace Platforms — Senior Software Engineer
Alt is an innovative alternative asset investment platform that enables users to trade collectibles similarly to stocks. Using proprietary valuation tools and secure vault storage, Alt empowers collectors to track real-time market value and manage alternative financial portfolios.Enterprise Project Overview Our software engineers manage the full SDLC to build Alt’s secure, high-performing web and mobile platforms. Developers build hybrid authentication flows via Stytch (OAuth, MFA) and multi-channel payment interfaces supporting ACH, wire transfers, and automated Stripe workflows. The team develops GraphQL APIs, mobile modules like the "Instant Pricer," backend tracking for vault outtakes, and live-trend UI redesigns with over-the-air (OTA) releases via EAS. Operating under Agile methodologies and test-driven development (TDD), engineers maintain robust database structures, perform clean code refactoring, and execute releases with minimal defects.
Enterprise Software
E-Commerce
Integrations
FashionTech
Information Technology
+20

Telemetry Hub project preview
Scout logo
Scout
Telemetry Hub — Senior Software Engineer
Scout APM provides application performance monitoring tools that deliver real-time insights into application health, database queries, and performance bottlenecks, helping developers optimize software speed and reliability. Our software engineers manage the full SDLC to advance Scout APM's performance monitoring platform. Developers process and transform massive datasets using Pandas and GraphQL APIs while introducing cutting-edge technologies like DuckDB with WebAssembly (WASM) to optimize browser data rendering speed. Engineers drive strategic architectural design, lead technical guidance, and implement automated E2E testing using Playwright within CI/CD pipelines. Operating in Agile workflows with test-driven development (TDD), the team executes thorough code reviews, manual QA assessments, and rapid issue resolution. By maintaining robust SQL and database strategies, our engineers ensure top-tier performance, clean architecture, and minimal defects.
Enterprise Software
Architecture
Integrations
Business & Expert Solutions
Information Technology
+11

Preferred tools

View the preferred tools and apps used by Sergio T. to assess compatibility and alignment.

Bitbucket
Bitbucket
Jira
Jira
Oracle PL/SQL
Oracle PL/SQL
Slack
Slack
Google Drive
Google Drive
G Suite
G Suite
Git
Git
Github
Github
Gitlab
Gitlab

Career highlights

Discover Sergio T.’s professional journey, including employment history, certifications, and educational background.

Senior Software Engineer
Senior Software Engineer
First Factory⸺2020 - pressent
Engineers manage the full SDLC to build multi-service AI control platforms. Developers design pre-execution guardrails, answer verification pipelines, Python/TypeScript SDKs, and event-driven architectures. Operating in Agile with TDD, the team manages AWS CI/CD pipelines, SQL schemas, and API integrations to deliver high quality with minimal defects.
Software Engineer
Software Engineer
Midware⸺2019 - 2019
Develop scripts using TypeScript for Oracle’s NetSuite platform.

Testimonials

Director of Engineering @ First Factory

First Factory

Verified Testimonial

“Sergio is one of the clearest communicators I’ve worked with: direct, easy to follow, and good about keeping people in the loop without being asked. He takes an unusual amount of ownership over his work, moving on things well before anyone has to assign them. He’s also one of the best code reviewers I’ve worked with, the kind whose comments improve both the code and the person who wrote it. On top of that, he brings deep Python knowledge.“

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