Bruno Santos

Lead Software Engineer Backend Specialist Technical Leader

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bruno@quack5.com GitHub

GitHub

quack5.com

Brazil

Professional Summary

Seasoned software engineer with 18+ years of experience designing, building, and scaling backend systems for high‑impact products. I combine deep technical expertise in Elixir, Ruby, and distributed architectures with a leadership style rooted in trust, clarity, and shared ownership.

I thrive at the intersection of craftsmanship, mentorship, and measurable results—delivering systems that perform, teams that grow, and solutions that make a difference. Driven by curiosity, collaboration, and the belief that the best software is built by empowered teams.

Skills

Languages & Frameworks: Elixir, Phoenix, LiveView, Ruby, Ruby on Rails, TypeScript, React, GraphQL
Databases & Data Stores: PostgreSQL, MySQL, Redis, Elasticsearch, Neo4j
DevOps & Infrastructure: Docker, Kubernetes, AWS, Google Cloud Platform (GCP), Terraform
Messaging & Queueing: RabbitMQ
Practices & Methodologies: TDD, CI/CD, Scrum, Kanban, Pair Programming
Other: API design, Microservices architecture, Distributed systems, Performance optimization

Professional Experience

Senior Software Engineer - Calmwave

Nov 2025 - Current

Led a read-model migration from Commanded projections to in-memory GenServers for latency-critical paths, reducing read times while simplifying query-side architecture.
Led patient identity migration from surrogate IDs to synthetic IDs, designing matching logic across HL7 identifiers and demographics to unify records from heterogeneous systems.
Drove BI modernization by replacing Snowflake-based reporting with an internal Phoenix LiveView dashboard, improving data access speed and reducing analytical handoff overhead.
Led team-wide AI adoption by defining engineering standards, guardrails, and safe workflows
Partnered with data science to build Python modules and robust Elixir/Python interfaces for the Algorithm Engine.

Lead Software Engineer - Shopnomix

Jul 2024 - Oct 2025

Architected a high-performance ad bidding platform using Elixir and Phoenix LiveView, supporting real-time tracking and optimization for thousands of concurrent bids.
Designed PostgreSQL data models that improved query efficiency by **40%**, enabling faster and more accurate ad placement decisions.
Led a company-wide adoption of TDD, reducing production defects by **35%** and shortening deployment cycles.
Mentored engineers, fostering a culture of quality, open communication, and continuous learning.

Senior Software Engineer - Allovue, Inc.

Mar 2022 - Aug 2024

Spearheaded the development of a state-funded educational finance portal, enabling transparency and efficiency in public school budgeting.
Modernized and expanded the core of existing school finance products, improving performance and scalability for thousands of end-users.
Championed Elixir/Phoenix adoption to enhance maintainability and speed of feature delivery.
Collaborated closely with product and design teams to align technical direction with user needs.

Senior Software Engineer - Remote Technology, Inc.

Aug 2021 - Mar 2022

Built custom HR platform integrations with robust bidirectional data synchronization via APIs and webhooks.
Improved system reliability and reduced integration errors through proactive monitoring and automated testing.
Enhanced developer experience by refining CI/CD workflows.

Senior Software Engineer - Foxbox Digital

Jun 2020 - Jul 2021

Designed and delivered ecommerce solutions integrating Elixir/Phoenix, Ruby on Rails, React, and ElasticSearch with platforms like Shopify and Salesforce.
Developed ecommerce analytics systems integrating BigQuery, Google Sheets, and multiple data pipelines.
Contributed to architecture decisions across multiple projects, ensuring scalability and maintainability.
Interviewed backend candidates and mentored team members.

Time off to recharge and focus

Jan 2020 - May 2020

Senior Software Engineer - XING GmbH & Co. KG

Oct 2018 - Dec 2019

Delivered new features for Ruby on Rails applications while guiding Elixir adoption for greenfield projects.
Designed APIs in close collaboration with frontend teams, improving API usability and consistency.
Worked within cross-functional teams to deliver value using Scrum and Kanban.

Backend Team Lead - Wunder Carpool

Feb 2017 - Sep 2018

Managed a team of backend engineers, conducting 1:1s, mentoring, and guiding technical decisions.
Planned and shipped features with a focus on scalability and maintainability.
Migrated portions of the system to a graph database, improving data modeling capabilities.
Managed and mentored a team of 7 engineers, improving team productivity through effective coaching and process optimizations.
Led migration of a legacy Ruby API to Elixir microservices, reducing system downtime by 40% and improving API response times by 70%.
Directed migration of key data services to Neo4j, enhancing query performance by 50% and significantly simplifying data structures.
Streamlined feature planning and execution processes, reducing feature delivery timelines by 20%.
Collaborated closely with mobile and frontend teams to enhance integration processes, decreasing integration errors by over 30%.

Senior Software Engineer - TIDY Homekeeping

Mar 2016 - Jan 2017

Worked on the backend building an API using Ruby on Rails, PostgreSQL, Redis, Sidekiq and Docker, which supported multiple web and mobile applications
Built a small PoC using Elixir and Phoenix

Software Engineer - Quimbik, Inc.

Aug 2012 - Feb 2016

Developed several websites using Ruby on Rails, MySQL and Javascript
Built REST APIs with Ruby on Rails that were consumed by mobile apps
Helped in projects with other technologies such as Objective-C, Groovy/Grails, and Java

Earlier Experience

Senior PHP Developer - FPP EDU-Media, Inc. (2010 - 2012)
Web Developer - WAD Soluções para Internet (2008 - 2010)
Delphi Developer - BWN Aplicativos (2007 - 2008)