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Full-stack software craftsman and technical leader with over 15 years of experience. Equally adept at system design, programming, technical leadership, mentorship, and business collaboration. Have a wide breadth of technical experience, but specialize in backend API development, relational databases, and web applications. Passionate about simplicity and efficiency. I have worked at over a dozen companies large and small, in a handful of different domains. Also participated in hundreds of interviews, about half-and-half as the interviewer and the interviewee. I have given dozens of talks and training sessions on a variety of topics, mostly focusing on distributed systems, caching, and testing. My top skills are Java, SQL, testing, and refactoring. I have experience with formal academic and professional mentorship, and would love to help you skill up, solve a problem, or just nerd out with you today!
I'm a Staff Software Engineer at Instacart (Previously Microsoft and Blablacar), I'm an experienced Java and mobile developer with 8+ years professional experience, primarily in Java and Android development and I also have experience writing backend applications with Clojure and a little bit of Haskell. My Work on Github : https://github.com/chemouna My specialties are creating mobile application, debugging, software design, refactoring legacy code, creating unit and functional tests, automating builds and deployments specially for mobile apps. I am a professional engineer with a master's degree in Computer Engineering. I love functional programming whether with Haskell or Clojure and also have a lot of experience developing Android apps.
I enjoy helping projects of all kinds to move forward, solving a wide variety of problems, and producing well-tested code that is clean and thoughtful and that keeps paths open for future extension. Though most of my recent years have been spent building within the Elixir and Phoenix/LiveView ecosystem, I also have many years of experience with Ruby on Rails. I use a Lean perspective when planning a project and writing code, keeping a reasonable balance between short-term and long-term and between perfection and achievable greatness, as I explore the solution space iteratively. I have made a special study of software development productivity analysis and improvement, so I have insights and techniques to contribute from that domain. Over many years I have built internal and external B2B and B2C Full-Stack Web apps and Backend APIs for small companies, startups, and large organizations in the Advertising, Marketing, Education, Meal Kit, Health and Fitness, Accounting, Finance, Government, and International HR spaces. Along with that experience, my thinking was also shaped by the degrees I earned in Chemical Engineering and Computer Science, which formed an outlook that combines an engineer’s calculated pragmatism with the rigor of theoretical explorations and known methods, including significant exposure to Statistics, Data Mining, and Numerical Methods. While meticulous with my time and productivity, I value calm thinking, deep work, and a methodical process that also takes intuitive leaps and assesses a range of options, to drive delivery of projects and features. That ethos is reflected in my ongoing Phoenix LiveView (PETAL) side project, Peak Pace, which captures my research into techniques that go beyond typical Kanban and resource capacity management, to model and effectively optimize the productivity and predictability of business and team processes using BPMN, simulations, and queuing theory. Those same analytical tools are also valuable when diagnosing software application performance. I’m a U.S. citizen living for now in Portugal, and I have good conversational ability in German.
I’m Michael Kohl, generally known as citizen428 online. I started programming in BASIC on my Commodore 64 and am lucky enough that I could turn my hobby into a career: over the years I worked as systems engineer, software developer, penetration tester, CTO and IT journalist. I’m currently self-employed, so if you have an interesting project to talk about, please contact me at citizen428 at omg dot lol. I’m also very interested in community building. I previously ran the Lambdaheads functional programming user group in Vienna, and am currently involved in Bangkok.rb, RubyConf Thailand, as well as PyCon Thailand.
Have experience in Backend -> Java/Go Data -> Spark/Flink/Kafka/Hive
I am a seasoned developer specializing in developing high performance, scalable data processing pipelines and machine learning solutions. I have experience in working in variety of environments (ranging from large from small startups to large enterprise companies), roles (from teaching curriculum curator, through front-line developer to solution architect) and domains.
I teach Operating Systems to CS students and guide fellow professionals through legacy codebase maintenance, practical software architecture, and new language/framework learning skills. For students, I offer two types of sessions - one is a lecture-style session where I can go over course notes/slides on a particular topics and offer additional explanations and examples to improve your understanding of the material. Another type is an assignment take-up session where I can go over a past assignment and guide you through steps to solving it. For working professionals, I offer the following options: * Focused problem-solving sessions - if you have a particular issue that you're stuck with in a project you're working on, I can pair with you over Zoom screen-sharing * Code review - if you cannot understand how to work with part of your codebase or if you'd like a second opinion on work that you've just completed, I can pair with you over Zoom and do a live code review and/or prepare ahead of time and go over my findings on a call * Long-term mentorship - if you would like to learn some more fundamental skills or pick up a framework/design pattern/best practices, I can develop a custom-tailored learning plan that fits your skill level and schedule and offer regular teaching sessions with optional take-home exercises A bit about me --- I am a tech founder and a senior polyglot/full-stack developer, with a passion for teaching and mentorship. In a bit of spare time from my work, I am looking to help fellow software developers get more comfortable with our craft and exercise my teaching skills while I'm at it. So far, I've done a wide range of work - web app front-end and back-end, data pipelines at scale, DevOps/infrastructure, mobile (quite a bit of iOS and previously some Android) and some security. I have a reasonable taste for UI design and user experience, despite that not being my primary specialization. The industries I've worked in so far were heavily concentrated around finance/banking/FinTech and GovTech, although I've also been a founding developer at a couple of B2C startups and learned a lot throughout that experience. My personal research interests include operating systems and programming language theory. As cliche as it sounds, I try to learn something new all the time and I consider this of vital importance to my professional skillset. I always prioritize systems understanding and learning how to learn over memorizing APIs - and it's a philosophy that I try to share with my students as well. Teamwork and constant exchange of expertise with my peers is a close second most important value to me. A software product can be almost meaningless without a team that welcomes learning from failures, encourages curiosity and fosters true human friendships, and empathy both towards each other and towards the customers of the software we create. New client intake process --- 1. Intro/triage call [free of charge] [15 min] - this is a Zoom video call where I try to understand your background, the problem you're looking to solve and whether I believe we'd be a good fit for a productive mentor/mentee relationship. 2. Supplemental terms acceptance - as an independent contractor and not an employee of Arc, I ask my clients to accept a few additional terms that make session time measurement, scheduling and work product acceptance more precise, and further clarify the extent of our mentorship relationship. 3. Creation of Freelance Job/Scheduled Session on Codementor - if you haven't done that yet, I will ask you to create and assign me a freelance job and/or a scheduled session with a precise description of the topics we would be covering. For certain sessions, preliminary preparation may be required - if that is the case, we would discuss the details and estimated time ahead of time and a Freelance Job would be required to cover the effort of the preparation. Availability --- Please take a look at my Codementor calendar to plan intro calls and sessions. Generally, I am available between 3:30pm and 8pm Eastern Time (New York/Toronto), Monday to Saturday, but I try to schedule all of my teaching engagements between 6pm and 8pm whenever possible. *IMPORTANT: Urgent sessions are unfortunately not available at this time.* I am currently working through Codementor as a mentor, and unable to work as an on-call freelance developer. Please also note that I cannot provide consultations over chat - in my experience, it's generally more time-consuming for everyone, and copy-pasting code over chat can get messy. For those reasons, I only work through Zoom video calls with screen sharing. If you have any questions about the process or would like to book a call, I am happy to chat on Codementor - I should be usually available Monday-Saturday, 1pm - 8pm Eastern Time, subject to my other engagements. While I try to respond as soon as I can, I may take up to one business day or longer depending on how busy my schedule might get.
Personally I am passionate about programming languages in general, enjoying clear understanding about the way they work. I can help you to learn programming languages, including unconventional ones, like Lisp, Erlang, Prolog, Haskell or Scheme. I also can help you with academic topics such as Lambda Calculus, Finite Automata (Finite State Machine), Push-Down Automata, Finite State Transducers and others. I enjoy explaining complicated things in a simple way. My past production experience mostly comprises from three things: - backend development with Ruby on Rails on various small and average-size projects - work on Flussonic video streaming server at Erlyvideo company using Erlang - frontend development using React, JavaScript and also a wide range of other languages and technologies.
I have a Master's of Science Degree in Computer Science, and I have industry experience in Software Development. I understand programming on both a theoretical level and a practical level. I have knowledge of various topics such as Functional Programming, Object-Oriented Programming, and Web Development. I have experience programming with many languages such as JavaScript, Scala, Java, C++, and C. I would like to pass on some of my knowledge to others.
I emphasize value added, ROI and communication. If my skills could help your business, your team or you yourself then we should work together.
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