Open to opportunities

Alex User

@alexuser90

AI & API Engineer at Caliber building Agentic RAG infrastructure and data ingestion tools; previously contributed to Neurons’ API growth.

Portugal

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What I'm looking for

Looking for DevOps and Backend jobs with high degree of autonomy.

At Caliber, I build and maintain infrastructure and features for an AI Assistant based on Agentic RAG, including data ingestion tools for web scraping and search API integrations.

At Neurons, I contributed to the architecture and launch of version 2.0 of the public API. It provided the technical foundation for scaling from 7 to 20+ active enterprise clients and contributed to ARR growing from €250K to over €1M.

I also engineered a self-service API Sandbox and technical documentation at Neurons, helping new API users find implementation recipes and reducing support queries and onboarding time. I implemented infrastructure as code with Terraform and Docker on GCP, and designed data integrations using Airbyte.

I started in QA and SDET roles, building automated testing strategies and quality processes at companies including Productboard and Smartlook. My personal projects include töökratt, a RAG job search copilot that ingests listings and answers with citations, and DevOps work for the athme sports community app.

Experience

Work history, roles, and key accomplishments

Current

AI & API Engineer

Current

Caliber

Apr 2026 - Present (6 months)

Build and maintain infrastructure and features for an AI Assistant (Agentic RAG). Build data ingestion tools including web scraper and web search API integrations.

Python RAG Vector Databases Web Scraping Search APIs LangGraph AWS Terraform Docker Grafana PostgreSQL

Backend Engineer

Neurons

Nov 2023 - Mar 2026 (2 years 4 months)

Contributed to the architecture and launch of version 2.0 of the public API, providing the technical foundation to scale from 7 to 20+ active enterprise clients and contributing to a 400% increase in ARR. Engineered a self-service API Sandbox environment and comprehensive technical documentation, reducing technical support queries and slashing client onboarding time. Implemented Infrastructure as

Python Django fastAPI Pytest Docker TypeScript Terraform GCP PostgreSQL Postman Serverless Go Airbyte

Software Developer in Test (SDET)

Neurons

Sep 2022 - Oct 2023 (1 year 1 month)

Architected the initial automated testing strategy for both Frontend (TypeScript/Cypress) and Backend (Python/Pytest), ensuring test coverage for critical paths. Conducted Load Testing, identifying performance bottlenecks and introduced Contract Testing.

TypeScript Cypress Python Robot Framework Contract Testing Gitlab CI GitHub Actions Docker GCP Postman

Test Automation Engineer

Startup Development House

Apr 2022 - Aug 2022 (4 months)

Mentored the engineering team on automation tools and best practices. Built Cypress suites for OAuth and CAPTCHA flows; added Percy visual regression testing across platforms.

TypeScript Cypress Percy GitHub Actions

QA Engineer

Pento

Aug 2021 - Mar 2022 (7 months)

Bootstrapped QA from zero with Cypress and GitHub Actions, owning the E2E and visual/functional quality pipeline (Percy, TestRail).

Cypress GitHub Actions Percy TestRail

QA Engineer

EPAM

Apr 2021 - Aug 2021 (4 months)

Automated testing for a high-traffic E-commerce platform, covering accessibility (A11y) and visual regression with WebdriverIO and Applitools.

WebdriverIO Applitools Accessibility Testing Visual Regression Testing

Quality Engineer

Productboard

Nov 2018 - Mar 2021 (2 years 4 months)

Bootstrapped QA as the company's first Quality Engineer, establishing testing standards for a rapidly scaling engineering organisation. Built TypeScript/Cypress frameworks integrated into CircleCI and GitLab CI; managed Docker, Kubernetes, and AWS test environments. Pioneered Contract Testing for microservices; mentored junior QEs and evangelized quality practices across product teams.

JavaScript TypeScript Cypress Docker Kubernetes CircleCi Gitlab CI AWS Terraform Grafana Jira

Software Tester

Smartlook

Nov 2017 - Oct 2018 (11 months)

First dedicated tester: built quality processes and the company's first CI automation (Drone CI, Travis CI). Previously Customer Support (Jan–Oct 2017): technical first-line support and knowledge base.

Drone CI Travis CI Quality processes