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Bruno Arndt

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Software Engineer III at Loggi
São Paulo, Brazil

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Jobs verified_user 0% verified
  • G2i Inc.
    AI Quality Analyst | LLM Evaluation & Validation | Test Design, Edge Cases, Response Ranking, AI QA
    G2i Inc.
    Sep 2025 - Jan 2026 (5 months)
    Worked as an AI Quality Analyst responsible for validating AI training tasks with a strong focus on quality assurance, testability, and evaluation rigor. Reviewed prompts and problem statements to ensure clarity, completeness, feasibility, and sufficient context, validating that tasks were objectively testable and included meaningful edge cases and evaluation criteria. Performed systematic comparative analysis of multiple human-generated responses, assessing correctness, reasoning depth, technical accuracy, and requirement coverage in order to rank and justify the highest-quality output. Applied consistent QA standards to detect ambiguity, under-specification, and logical gaps, and provided structured feedback to improve dataset reliability
  • Outlier
    Squad Leader
    Outlier
    Dec 2024 - Jul 2025 (8 months)
    Served as Squad Leader for a distributed team responsible for training and evaluating LLMs for code generation, with a primary focus on team leadership, quality consistency, and delivery execution. Led and mentored specialists across multiple programming languages (Python, JavaScript, TypeScript, Java, C, and C++), aligning individual contributions to shared quality standards and evaluation criteria. Established structured team processes including regular 1:1 coaching, daily standups, live collaborative reviews, and shared documentation to reduce ambiguity and improve reviewer calibration. Acted as the primary quality gate, monitoring output consistency, identifying systemic quality issues, and driving corrective actions at the team level.
  • Differential
    Sr. Backend Python
    Differential
    Sep 2024 - Sep 2025 (1 year 1 month)
    Led integration efforts between a custom Church Management System (CMS) and third-party services, solving critical challenges around synchronization reliability, data mapping complexity, and undocumented partner APIs. Designed and implemented robust APIs and event-driven pipelines using Python, Node.js, TypeScript, REST, and GraphQL, with a strong emphasis on fault tolerance and error handling. Leveraged Astro to orchestrate seamless data flows across services, enabling scalable and maintainable integrations. This work resulted in significant improvements in data consistency, faster onboarding of new integrations, and increased sync success rates. Deepened expertise in system integration patterns, resilient API design, and Astro architectur
  • Outlier
    AI Software Engineer
    Outlier
    Mar 2024 - Dec 2025 (1 year 10 months)
    Contributed as an AI Software Engineer with a strong focus on quality assurance and evaluation of AI-assisted code generation systems. Reviewed and validated AI outputs across complex, real-world engineering scenarios, identifying issues related to ambiguous prompts, logical inaccuracies, brittle solutions, and insufficient test coverage. Performed structured analysis of model behavior to detect recurring error patterns, assess robustness across edge cases, and evaluate output correctness across multiple programming languages, including Python, JavaScript, TypeScript, Java, and C/C++. Curated and refined high-quality engineering scenarios to improve evaluation reliability and model consistency. Designed and executed targeted evaluation expe
  • Loggi
    Software Engineer III
    Loggi
    Oct 2021 - Dec 2023 (2 years 3 months)
    Led the creation and adoption of a new Design System to address inconsistencies across apps, improve UI development speed, and ensure accessibility and data coherence. Collaborated closely with developers, designers, and product owners to standardize components using React, TypeScript, Storybook, MUI, and Figma. The system significantly accelerated delivery cycles, reduced frontend bugs, and strengthened design-dev alignment. Acted as a UX advocate across teams and mentored junior developers to elevate code quality and consistency. Before that, I led a cross-tribe initiative to redesign and unify the user experience across multiple app teams—streamlining navigation and consolidating outdated libraries. These efforts expanded my leadership i
  • Loggi
    Software Engineer II
    Loggi
    May 2020 - Oct 2021 (1 year 6 months)
    Served as the frontend lead in the squad responsible for rebuilding the signup and onboarding experience from the ground up, with a focus on improving conversion, reducing friction, ensuring compliance, and replacing legacy flows. Led the development using React, GraphQL, REST, and Python/Django, working closely with designers and backend engineers to deliver a UX-driven, scalable solution. This resulted in a higher signup rate, faster onboarding, reduced user drop-off, and improved maintainability. In parallel, I was responsible for maintaining and improving a legacy system built on React with Relay Classic and GraphQL, where I led efforts to reduce technical debt, stabilize performance, and modernize the codebase through targeted refactor
  • Loggi
    Trainee
    Loggi
    Feb 2020 - Apr 2020 (3 months)
    Worked as a fullstack developer in the squad focused on improving the delivery experience by optimizing communication, streamlining UX, and reducing operational errors. Contributed to both frontend and backend, enhancing the system to handle large datasets efficiently and improving test coverage—particularly around stress scenarios. Delivered UX improvements that led to faster deliveries, fewer user-facing issues, and higher satisfaction. Collaborated closely with designers, backend engineers, and operations to align tech with real-world delivery workflows. This role deepened my practical expertise in React, Python, and scalable app development.
  • C
    Company Owner
    Jun 2018 - Jun 2022 (4 years 1 month)
    Worked as a fullstack developer at a leading Brazilian health education company, where I was responsible for developing and maintaining the public website (PHP, WordPress, MySQL), internal systems (CRM, ERP), and learning platforms. Tackled challenges like poor UX, manual processes, and lack of integration by designing APIs, modernizing backend architecture using PHP and Zend Framework, and building user-friendly interfaces with React. Delivered improvements that boosted system stability, reduced manual overhead, and increased both customer satisfaction and course sales. Gained deep experience in PHP backend architecture, API design, platform integrations, and leadership across cross-functional teams.
  • Universidade de São Paulo
    PhD scholarship
    Universidade de São Paulo
    Feb 2017 - Sep 2017 (8 months)
    PhD scholarship
  • U
    Scholarship
    UFSCar - Alumni
    Sep 2015 - Mar 2016 (7 months)
    Masters scholarship
  • S
    Scholarship
    Jul 2015 - Dec 2015 (6 months)
    Scholarship received to teach Software Engineering for undergrad students.
  • New Way
    Freelancer
    New Way
    Apr 2011 - Jun 2014 (3 years 3 months)
    Worked as a fullstack developer and software engineer serving local businesses across legal, food, and dental sectors. Delivered custom web applications using PHP with Zend Framework, jQuery, and Ext JS, backed by MySQL and PostgreSQL. Helped clients modernize outdated systems, streamline inefficient workflows, and implement complex business logic—resulting in more efficient operations and reduced manual tasks. Also managed the company's Linux server infrastructure, including setup, backups, security, updates, and deployment pipelines. Gained deep hands-on experience in backend and frontend architecture, server administration, and direct client communication in a Scrum-based environment.
  • Lecom
    Internship
    Lecom
    Mar 2009 - Oct 2009 (8 months)
    Developed and maintained government systems for Bauru’s city hall, focusing on modernizing outdated, manual processes. Built new backend tools using Delphi and Firebird, and maintained legacy platforms developed in Visual Basic 6, SQL Server, PHP, and jQuery. Helped improve system performance and digitize key workflows, contributing to more efficient internal operations. This role strengthened my skills in backend development, legacy modernization, and foundational system design within public sector constraints.
  • C
    Internship
    Colégio Técnico Industrial "Isaac Portal Roldán"
    Feb 2009 - Apr 2011 (2 years 3 months)
    Designed and developed a custom online grade and class council system from scratch using PHP, PostgreSQL, Ext JS, and jQuery. Tackled a fully manual, paper-based grading process with no digital backup by building a scalable, user-friendly platform that automated grade entry, streamlined reporting, and improved data reliability. Worked as a solo developer, owning the entire solution—from backend logic to frontend UX design. This project not only brought major time savings to educators and administrators but also sharpened my skills in PHP, JavaScript, UX, and technical leadership.
  • Correios
    Internship
    Correios
    Jan 2008 - Dec 2008 (1 year)
    I was responsible to develop a system to organize old fisical files. Also, I create some spreadsheets to organize defaulting customers.
Education verified_user 0% verified
  • University of South Florida
    doctor, Communication Sciences and Disorders
    University of South Florida
    Jan 2018 - Jan 2019 (1 year 1 month)
  • USP - Universidade de São Paulo
    doctor, Doctor of Philosophy - PhD Distúrbios da Comunicação
    USP - Universidade de São Paulo
    Jan 2016 - Jan 2020 (4 years 1 month)
  • U
    master, Master of Computer Applications (MCA) Computer Software Engineering
    UFSCar - Alumni
    Jan 2013 - Jan 2016 (3 years 1 month)
  • Universidade Estadual Paulista Júlio de Mesquita Filho
    bachelor, Bacharelado Sistemas de Informação
    Universidade Estadual Paulista Júlio de Mesquita Filho
    Jan 2009 - Jan 2012 (3 years 1 month)
  • C
    Técnico Informática
    Colégio Técnico Isaac Portal Roldán
    Jan 2006 - Jan 2008 (2 years 1 month)
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