# Rainier Ababao

> Engineering at Flow

Location: Austin, Texas, United States
Profile: https://flows.cv/rainier

Experience at early to late-stage startups, including a period of incredible growth at Abnormal Security. Now focused on the future of living, at Flow — flow.life

Passionate about the craft, our customers, and excited about the future.

## Work Experience
### Tech Lead @ Flow
Jan 2026 – Present

### Engineering @ Flow
Jan 2024 – Present
Joined Flow’s early engineering team (<10 → 70+). Work across multiple teams and functions designing foundational systems for Flow’s digital twin of real-world agreements that serves as the programmable layer for workflows across Flow’s digital twin of buildings, assets, and diverse lines of business (not just multifamily).

Conceived a declarative DSL for operating on Flow’s entity graph and contributed to the design of AI-native ontologies and primitives for agreements and other core entities.

Led technical design and validation strategy for complex migrations (involving async + event-driven data pipelines), and built reconciliation and verification tooling to ensure correctness of financial general ledger and contractual data.

Core interviewer for Flow’s code review loop, evaluating software design and engineering judgment. Conducted 40+ interviews and trained additional interviewers.

https://a16z.com/announcement/flow/

### Software Engineer - Tech Lead @ Abnormal AI
Jan 2022 – Jan 2023 | San Francisco, CA
Tech Lead for human-in-the-loop review and label generation products at Abnormal:
· Defining the roadmap and building the infrastructure + tooling that supports a world-class human feedback loop, resulting in superior threat detection efficacy for Abnormal’s customers and constant improvement of our ML systems over time
· Invested in growing new engineers at the company through both one-on-one and structured learning initiatives that I proposed and led

Used: Python (Django, Celery), JavaScript (React), Redis, SQL, Databricks, Terraform, Kubernetes, AWS

### Founding Engineer @ Sail
Jan 2021 – Jan 2021 | San Francisco, CA
(now defunct) Some folks had a “web3 gap year”; I had a browser gap year 🫡

First engineer hire for Chromium-based multiplayer browser. Owned changes to Chromium, devised and wrote related tooling for building and rebasing, designed and built new chrome.XX APIs to support multiplayer features, built desktop app update infrastructure, filmed demoes, did user research, helped hire engineers 2-4.

### Software Engineer @ Google
Jan 2019 – Jan 2020 | San Francisco, CA
Key contributor to user-facing products, such as Looker's Slack integration 💜 (https://cloud.google.com/blog/products/data-analytics/slack-integration):
· Wrote APIs for mapping custom Slack commands to Looker queries, frontend and backend for its App Home, link unfurling, linking multiple Slack workspace accounts to Looker accounts and installations.
· Added timing and retry metrics for calls to external services in a multi-tenant proxy service used for routing all Slack events to a Looker instance, and wrote the first draft of the service runbook.
· Added product analytics for the Slack integration and wrote the main document for describing user interaction types in our usage analytics store.
· Fixed bugs in Looker's viz render and delivery (scheduled dashboards, S3, email, webhook, etc.) pipeline.

Used: Kotlin (ktor), Ruby, TypeScript (React), Slack APIs (OAuth flow, Block Kit), Datadog

### Software Engineer @ Domino Data Lab
Jan 2018 – Jan 2019 | San Francisco, CA
Key contributor to user-facing product launches for enterprise MLOps platform:
· Got data scientist user code (notebooks/batch jobs/Flask apps) on Kubernetes, implemented full-stack features for Control Center (usage dashboard for DS leaders), Launchpad (Flask app deployment), and Experiment Manager (one-off DS job management).
· Worked with CTO to refactor user code logging infrastructure and pay off tech debt, spread domain-driven design practices and implementation.
· Led new engineer onboarding program by designing new processes and working with Head of Talent Development and eng managers.
· Helped sell the company to new grad candidates as the first new grad hire.

Used: Scala (Play), k8s APIs, TypeScript (React), styled-components, ramda, MongoDB, Redis

### Software Engineer Intern @ Medallia
Jan 2017 – Jan 2017 | Palo Alto, CA
Text Analytics team - Topic clustering API for customer reviews

### Software Engineer Intern @ Desktop Genetics
Jan 2016 – Jan 2016 | London, United Kingdom
Shopping cart for CRISPR/Cas9 oligo products

### Software Engineer Intern @ Clover Network Inc.
Jan 2016 – Jan 2016 | Sunnyvale, CA
Sped up a metrics ETL service by 500x by rewriting it from Python to Go and refactoring inefficient Java serialization/deserialization code

### Software Engineer Intern @ Bold Metrics Inc.
Jan 2015 – Jan 2015 | Austin, TX
• Improved developer dashboard with REST API demo, responsive UI, data visualization with d3.js
• Full-stack implementation of client management web app for sales team
• Wrote machine learning API regression tests in Python (model drift and integration testing) and increased unit test coverage
• Designed and developed size recommender demo displayed at major e-commerce trade show

Used: Python, Bash; Flask, Redis, MySQL, HTML5/CSS3, jQuery, d3.js; TravisCI, Git


## Education
### BS in Computer Science
The University of Texas at Austin


## Contact & Social
- LinkedIn: https://linkedin.com/in/rainier
- Website: https://angel.co/rainiera
- GitHub: https://github.com/rainiera
- Website: http://rainier.io

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Source: https://flows.cv/rainier
JSON Resume: https://flows.cv/rainier/resume.json
Last updated: 2026-03-22