Leandro Siqueira

Leandro Siqueira

About

Detail

Independent Data Annotator | LLM Prompt Engineer | AI Code Trainer | Alignment Specialist
Muriaé, State of Minas Gerais, Brazil

Contact Leandro regarding: 

work
Full-time jobs
Starting at USD20/hour
Flexible work
Starting at USD25/hour

Timeline


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Job
school
Education

Résumé


Jobs verified_user 0% verified
  • A
    Prompt and Content Alignment Specialist for Generative AI
    Alignerr
    Jan 2025 - Current (6 months)
    • I work on linguistically grounded annotation tasks for generative AI systems, focusing on proactive message quality, personality alignment, and instructional clarity. I evaluate multilingual chatbot outputs (English and Portuguese) across tone, contextual relevance, stylistic precision, and personality fidelity. • I annotate proactive prompts based on conversational context, ensuring that outputs are safe, specific, and aligned with the bot’s intended persona. This includes classifying romantic or suggestive intent, identifying harmful or inappropriate language, and applying detailed labeling guidelines across user and AI interactions. • My work supports the development of trustworthy, culturally aware AI systems by aligning outputs wit
  • O
    Prompt Engineer / LLM Quality Rater
    Outlier
    Nov 2024 - Current (8 months)
    • I craft and evaluate complex tasks for generative AI models with a strong focus on code generation, logical reasoning, and instructional precision. I design prompts that challenge models across creative problem-solving, test case coverage, and step-by-step reasoning, using languages such as Python, Java, C#, and JavaScript. • I deliver structured golden responses that reflect best practices in clarity, correctness, and completeness. In addition to prompt engineering, I build full-stack test environments that mirror real-world developer workflows. This includes writing Dockerfiles, configuring automated test pipelines, and developing log parsers to extract structured outputs from execution logs, enabling thorough validation of model behav
  • E
    AWS Technical Trainer
    Escola da Nuvem
    Apr 2023 - Aug 2024 (1 year 5 months)
    • I led more than 200 learners through the AWS re/Start program, combining cloud instruction with career development support. To strengthen hands-on skills, I designed modular, scenario-based labs using EC2, S3, and Lambda, which increased practical performance by 40 percent. • I created individualized learning tracks based on each learner’s goals and launched a mentorship initiative that combined technical coaching with employability guidance. These efforts resulted in a 75 percent certification pass rate and 80 percent job placement within six months. • Additionally, I collaborated with AWS Educate to introduce real-world infrastructure scenarios, implemented CI/CD-based lab provisioning using CloudFormation, and produced reusable instr
  • J
    Backend and DevOps Engineer
    Joane Personalizados
    Nov 2022 - Mar 2023 (5 months)
    • I worked on scaling and optimizing a high-traffic CRM platform, focusing on backend performance, deployment automation, and system resilience. By optimizing SQL queries and implementing Redis caching strategies, I reduced page load times by 40 percent. • I also set up CI/CD pipelines using GitHub Actions, Azure DevOps, and Docker to streamline deployments. Additionally, I refactored Java backend components to improve stability and support a 20 percent increase in traffic without service degradation.
  • C
    Backend Engineer
    Centro Universitario FAMINAS
    Jun 2022 - Nov 2022 (6 months)
    • I developed and maintained RESTful APIs using PHP (Laravel) integrated with Microsoft SQL Server, supporting both academic and administrative systems. I improved query performance by 25 percent through indexing and strategic caching, resulting in faster data access across core services. • To strengthen security and compliance, I implemented role-based access control, enforced encrypted authentication protocols, and aligned system logic with internal privacy standards.
  • T
    Software Engineer – ERP and Automation
    Tarkus Tecnologia
    Oct 2020 - Apr 2022 (1 year 7 months)
    • I developed ERP modules for healthcare operations with a focus on automation, backend optimization, and usability. I improved scheduling performance by 25 percent by refactoring C# logic and optimizing database access. To streamline operations, I automated recurring tasks using Python and SQL scripts, reducing manual workload and improving system responsiveness. I also implemented a voice-control interface to simplify data entry and improve the overall user experience.
  • D
    Senior Technical Trainer
    DlteC do Brasil
    May 2015 - Oct 2022 (7 years 6 months)
    • I led more than 200 learners through the AWS re/Start program, combining cloud instruction with career development support. To strengthen hands-on skills, I designed modular, scenario-based labs using EC2, S3, and Lambda, which increased practical performance by 40 percent. • I created individualized learning tracks based on each learner’s goals and launched a mentorship initiative that combined technical coaching with employability guidance. These efforts resulted in a 75 percent certification pass rate and 80 percent job placement within six months. • Additionally, I collaborated with AWS Educate to introduce real-world infrastructure scenarios, implemented CI/CD-based lab provisioning using CloudFormation, and produced reusable instr
  • M
    Software Engineer – System Modernization and CI/CD
    Masterxp Solucoes Empresariais
    Feb 2015 - Apr 2020 (5 years 3 months)
    • I led the modernization of legacy enterprise systems by migrating core services to ASP.NET Core MVC. I developed C# automation tools that integrated HR and payroll systems via RESTful APIs, reducing manual errors by 40 percent and improving process reliability. • To increase deployment efficiency and system stability, I implemented CI/CD pipelines using Jenkins, Git, Docker, and Maven. These pipelines streamlined release workflows and reduced deployment time and rollback risk across multiple environments.
  • C
    Software Engineer – Web Systems and CI/CD
    CYCLONET Tecnologica Ltda
    Mar 2013 - Jan 2015 (1 year 11 months)
    • I developed high-throughput financial web applications by integrating scalable C#/.NET backends with responsive JavaScript frontends. To improve performance, I refactored stored procedures and optimized indexing strategies, reducing query times by 35 percent. • I also implemented CI/CD pipelines using Jenkins and automation tools to streamline deployment processes and increase release stability across environments.
Education verified_user 0% verified
  • Federal University of Rio de Janeiro
    Master of Business Administration in Software Engineering
    Federal University of Rio de Janeiro
    Mar 2015 - Aug 2016 (1 year 6 months)
  • U
    Bachelor’s Degree, Information Systems
    Universidade Salgado de Oliveira
    Feb 2010 - Jul 2014 (4 years 6 months)