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Lucas Penz

Senior Full Stack Engineer

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About Me

Experienced Full Stack Software Engineer with over 11 years in software development and 2 years teaching Computer Science. Proven leader in designing scalable, high-performance systems and fostering cross-team collaboration to deliver secure and reliable solutions. Adept at developing enterprise-scale applications, APIs, and robust architectures using Ruby on Rails, PostgreSQL, and JavaScript. Skilled in cloud technologies (AWS, Azure, GCP), with a strong focus on automation, performance optimization, and mentoring teams to achieve technical excellence.

Latest Projects

E-commerce

eCommerce Application, MIU (2020): Created e-commerce site in collaboration with one other team member. Stack: Angular, Node.js, Express, MongoDB

Source Code
Agendacard

AgendaCard (2019): Developed responsive web app to accommodate client-driven appointment scheduling for businesses such as hair salons. Stack: Ruby On Rails, MySQL, Javascript, Bootstrap, AWS, Redis, Sidekiq, Capistrano, MomentJS, Fullcalendar.io.

Source Code

Work Experience

Senior Software Engineer - Apple via TEKSystems (4/2022 - 9/2024)

Leading multinational technology company specializing in consumer electronics, software, and online services. In 2021, it generated $365.8 billion in revenue and, as of June 2022, is the world's largest company by market capitalization.

  • Improved cross-team communication by 25% through a new requirement gathering template.
  • Developed large-scale project to support major new physical processes in warehouses.
  • Developed a robust API for external teams/parties.
  • Enhanced report's performance through SQL tuning.
  • Fixed critical production bugs.
  • Implemented background job priority through Sidekiq.
  • Mentored new engineers and executed code reviews on GitHub.

Staff Software Engineer - Line 5 LLC (7/2021 - 4/2022)

Financial company which provides loans for customers to buy their car extended warranty.

  • Developed testing processes including communications and task templates which improved efficiency by 30%.
  • Led meeting with Product Owner and Development Team.
  • Led the development of a new payment page.
  • Managed application deploy and servers on Amazon EC2, S3.
  • Mentored junior developers, enhancing code quality and team productivity through regular code reviews and collaborative pair programming sessions.

Senior Software Engineer - Line 5 LLC (11/2020 - 7/2021)

Financial company which provides loans for customers to buy their car extended warranty.

  • Enhanced direct sales revenue by 25% through the development of self-service software utilizing Vue.js for direct customer transactions.
  • Oversaw the entire software development lifecycle, encompassing automated testing and deployment through Heroku.
  • Enhanced the performance of several queries, resulting in a significant increase of up to 100 times faster execution time.

Professor - Federal Technological University of Parana (8/2017 - 7/2019)

Nationally renowned university with 13 campuses.

  • Planned and delivered IT courses.
  • Created hands-on Agile Development course, using Ruby on Rails, GIT/Github, PostgreSQL, Ubuntu, and Bootstrap, resulting in student projects such as classes, blog, and a sales website.
  • Taught Project Management Course using PMBOK guidelines to address all 10 areas of PMBOK 5.
  • Developed curriculum and delivered Software Development Course, including topics such as quality, testing, and methodologies.
  • Educated students in Java Concurrency / Multithreading & Java Socket.

Staff Software Engineer - German Tech Systems (1/2016 - 3/2018)

Software company providing business systems support, accounting, tax, and stock management.

  • Implemented process changes that resulted in a 60% reduction in errors. These changes included more efficient code review and internal communication protocols.
  • Led meetings with Product Owner and Development Team.
  • Orchestrated a knowledge sharing session with the team to elucidate error handling, debugging techniques, and principles of writing clean code. This initiative resulted in a significant reduction of bugs, with a notable 50% decrease.
  • A significant 50% improvement in response time was achieved through effective management of the PostgreSQL database. This was accomplished by optimizing memory and buffer parameters.
  • Managed Nginx applications and servers on Amazon Web Services (AWS), including EC2 instances and S3 storage.

Software Engineer - German Tech Systems (11/2014 - 12/2015)

  • Reduced required man-hours.
  • Reduced memory requirements of tax calculation process (from 1.2 GB to 200 MB) by implementing a pipe processing model.
  • System-user interface enhancement through menu reorganization and provision of supplementary feedback messages, including progress bars and error messages.

Software Engineer - Oderco (4/2014 - 10/2014)

Computer equipment / electronics distributor.

  • Maximized security, permissions, maintenance, and performance by upgrading all internal support tools in conventional development model in PHP by CakePHP 1.3 framework, as well as Front-end Bootstrap 2.3.2 and jQuery that improved interface and usability in addition to maintenance and performance.

Software Engineer - Assis Gurgacz Foundation (12/2009 - 2/2012)

Institute of higher learning with 2,000 students.

  • Built, maintained, and updated website for the institution.
  • Created PHP software programs, such as Reserving, Event Controlling, and Evaluation Systems.
  • Developed multiple operations, using Debian, MySQL, Apache, and Postfix.

My GitHub