Sebastian Sastre

Senior software Engineer at Telna. Previously Sulvo, StarterSquad, Codementor and Airflowing.

+55 (45) 98421-2515

Website | Blog | LinkedIn | GitHub
In the last 9 years successfully delivered remote full-stack software development work helping diverse teams in companies and startups scaling their products.


  • Senior Software Entineer

    Telna, 2019 - present
    Smalltalk, Rust, Golang, Python, bash, TDD, Docker, SvelteKit, NextJs, Tailwind
    • Started working in a full-time position for Telna. Working directly with the Principal Telecommunications Architect in the roaming software that drives many terabytes per day for mobile telecommunications.
    • Design and implemented Proposto, an MVP using SvelteKit and Tailwind for the frontend and Pharo Smalltalk for the backend.
  • Lead Software Engineer

    Sulvo, 2017 - 2018
    AWS, GCloud, JavaScript, Meteor, VueJS, NodeJS, MongoDB, Docker, Machine Learning
    • Working as a full-stack developer in a full-time position at Sulvo, a remote-first company acting on the digital advertising segment. Designed and developed their new ad server that flawlessly operates more than a billion transactions per month.
    • Scored 92% in ML course
  • Full-stack Software Engineer

    StartedSquad, 2015 - 2016
    Swift, ReactJS, Meteor, CircleCI, AngularJs
    • Published Apito app in the AppStore. A native iOS app developed in Swift and it’s admin dashboard in JavaScript.
    • Helped across 4 teams on frontend tasks.
  • Open Source Developer

    2014 - 2015
    Smalltalk, jQuery, JavaScript
    • Published flow-stack framework (MIT)
    • Published Mapless Object Persistence framework (MIT)
  • Independent consultant

    2013 - 2014
    Credit Card Processing, Smalltalk, Seaside, AngularJS, Design Thinking
    • Web app for the telecommunications industry.
    • Helped in a back-office frontend application for ZorgDomein in a team of 15-20 developers.
    • Helped Freiburg IT Systems to implement a back-office system for Pitztal’s CRM using Seaside.
    • Completed Design Thinking Lab from Stanford University and Human-Computer Interaction from San Diego University.
  • Flowing

    Smalltalk, Seaside, Object Oriented Database, jQuery, Marketing, UX/UI Design, Product Design, Business Development, MongoDB, Proprietary Frameworks, Public Speaking
    • SaaS MVP. Presenting MVP to the regional group of ad agancies.
    • Airflowing launch (RIP 2015). It was a milestone receiving praise from Guy Kawasaki, Seth Godin, Derek Sivers among others, specially from flowing’s own clients. Airflowing was a SaaS, Software as a Service, web application for end-to-end team management on medium/small business focused on services. Meant to help clients to have control of sales, operations and cashflow.
  • Galenial Startup

    2007 - 2008
    Smalltalk, Crystal Reports, Object Oriented Database, Non-boolean search
    • Developed the prototype of a product for medical practice management using Dolphin Smalltalk.
  • Independent consultant

    2003 - 2005
    Smalltalk, Crystal Reports, Object Oriented Database, MySQL, PostgresSQL
    • Web app for the telecommunications industry.
    • Developed a Windows based desktop e-commerce application for Cromosol S.A..
  • Project Leader

    TEING 1998 - 2000
    Smalltalk, Crystal Reports, PostgresSQL, Proprietary Hardware
    • The developed product was a control system to manage and control toll processing in a Road Concession Company.

Computer Languages

  • Smalltalk.
  • JavaScript.
  • Swift.
  • Rust.
  • Golang.
  • Python.


  • Fluent english.
  • Fluent portuguese.
  • Native spanish.