Hire Top Freelance Functional Programming Developers

David Schoutens

Freelance Functional Programming Developer5.0 (84 reviews)

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!

Ashish Jaishwal (QA Test Automation)

**Automation Tools:** Selenium WebDriver with Core Java, Selenium with C#, Selenium with JS, Cypress,WebDriverIo, Playwright, Appium,Swtbot, etc **Languages:** Java, C#, Javascript, Python **Framework Used:** Page Object Model / Data Driven Framework/Keyword Framework, Cucumber(BDD), Jasmine, Robot framework, Specflow, Mocha **Mobile Automation:** Appium for Android and Ios Automation, WebDriverIo for Android automation only, etc **API and SQL Automation:** Java with JDBC, JS with mysql library, Cypress, postgres automation, etc **Unit Testing Framework:** TestNG, JUnit, NUnit **IDE Used:** Eclipse, IntelliJ, VSCode, Visual Studio IDE, Pycharm, etc **IDE automation:** Eclipse with swtbot, VSC with vsc-native-tester, IntelliJ with Java robot framework **Build Tool:** MAVEN, Gradle, Ant **Project / Defect Management Tool:** JIRA, Kanban,github, TestRail, ontestpad, Mantis, ASANA,Trello,BaseCamp,Redmine **Report:** TestNg Default, ReportNG, Extent Report, Allure Report& variousHTML reports **Version Control:** Git (Github, Gitlab, Bitbucket) **CI Tool:** Jenkins, Github Actions, Gitlab CI/CD **Software Testing/QA:** Regression Testing, Smoke Testing, Health Check, Functional Testing, Database Testing, Api Testing using Postman, Bug Life Cycle & Testing life cycle **TEST AUTOMATION** • Designed and implemented different automation frameworks from scratch like Page Objects framework, Keyword Driven framework, Data Driven framework and Hybrid framework for a number of projects • Have hands on experience on different flavors of Selenium like Selenium Web Driver with Java, C#, Python. • Have hands on variety of TDD & BDD testing frameworks like JUnit, TestNG, NUnit, XUnit, Mstest, Specflow, Cucumber, Pytest, Nose etc. • Have hands on experience on Cypress with TS or JS, Cypress for API Testing, Cypresss with Cucumber. • Have hands on experience with API Testing, with postman or programatically using REST Assured, RestSharp, Mocha-axios, etc. • Have hands on experience with IDE Automation like Eclipse with swtbot, VSCode with Vscode-extension-tester, Intellij with Robot framework • Have hands on experience with Mobile App testing with Appium & Java • Good Knowledge of different tools like Git, Jenkins, SQL, MySQL, etc **MANUAL TESTING** • Have a good knowledge of applications from various domain like, E-Commerce, AI based Job Portal, Telecom, Warehouse Management Domain, Content Processing application (OLIVE SOFTWARE), Health Care that makes me comfortable understanding the business and functional requirements of system. • CRM based application : Microsoft Dynamics 365, Magento, Salesforce • Extensively involved in preparing Test Scenarios & Test Cases from Requirement docs, Use Cases & KT's. • Defect reporting using various bug reporting tool and Involved in the defect review meetings. • Good exposure to Bug Life Cycle. • Accurate, efficient & methodical in handling assigned tasks. Possess excellent numerical, problem-solving & analytical abilities. • Have hands on writing End to End Scenarios/Business logic cases, Test plan, etc. and have performed Smoke Testing, Regression Testing, Comprehensive testing, Acceptance Testing.

Anayo Samson Oleru

I’m a Software Engineer with over 5 years of hands-on experience building scalable applications using JavaScript, TypeScript, ReactJS, React Native, and Node.js. I specialize in helping developers at all levels — from beginners to professionals — understand complex concepts clearly and confidently. As a mentor, I’ve completed successful mentorship sessions publicly and privately with several upcoming developers helping them land a job in tech, that contribution I am proud of. Whether you're debugging an issue, preparing for interviews, or learning full-stack development from scratch, I provide structured guidance tailored to your goals. I also assist with data structures, algorithms, design patterns, and mock interview preparation — ideal for those getting ready for software engineering roles or competitive programming challenges. My mission is to make sure every session delivers real value.

Petr Sima

Available in all timezones. Excelent English. I removed my old bio because it becomes outdated quickly. By now I've done enough to be able to say: I've really done a lot 🙂. I provide a full range of services to meet all your Swift needs.

Christopher Sahnwaldt

Software Engineer

Damián Rafael Lattenero

# 👋 Hi, I’m Damián **Senior Software Engineer** with 10+ years turning ideas into _real, working code_ — using **Kotlin**, **Java**, **Python**, **Haskell**, **JavaScript**, and **SQL**. --- ### 🚀 But here’s what really matters: I know how overwhelming programming can feel — and I’m *really* good at making it make sense. Whether you're: - A **beginner** who thinks `if` statements are witchcraft, - In **university or bootcamp** and your code feels like a tragic love story, - Or a **pro** getting roasted by a bug that mocks your debugger — **I’m here to help.** --- ## 🧠 How I Can Help ### **📍 Starting from zero?** - Learn **Python, Java, Kotlin, or Haskell** — no overwhelm, no nonsense. - Understand **core concepts**: variables, loops, functions — *and why they matter*. - Build **real projects**, not just toy examples. - Stop copy-pasting code you don’t understand — I’ll help you _actually get it_. --- ### **🎓 In school or bootcamp?** - Tackle **assignments** with clear explanations — not just magic answers. - Design class hierarchies that *actually make sense*. - Debug weird, soul-crushing errors. - Start **thinking like a developer**, not just surviving syntax. --- ### **💼 Already coding professionally?** - Write **meaningful tests** (JUnit, Mockito, pytest — no excuses). - Migrate from **Java → Kotlin** or **OOP → FP** — _without the pain_. - Work confidently with **Spring Boot, GraphQL, PostgreSQL, MySQL**. - Refactor legacy code for **clarity, speed, and sanity**. - Finally grasp **functional programming** — yes, *even monads* (no PhD needed). --- ## 🎯 My Teaching Style - **No ego, no jargon** → Ask anything. I’ll meet you where you are. - **"Why" over "what"** → I’ll help you _understand_, not just repeat. - **Adaptable & fun** → If cat memes help you learn, I’ll bring the cats. 🐱 --- ## ✅ Bottom line? Whether you’re stuck, starting out, or leveling up — **we’ll make progress, one clear concept at a time.**

Dan Cook

I have a long-standing passion for coding, and have received great feedback as tutor & mentor over 10+ years as a Software Engineer. I have an expert mastery of Javascript, Typescript, C#, GIT, CSS, HTML, and have implemented solutions at all levels of the tech stack. I feel strongly that software is built for people, and not the other way around: I strive to provide solutions that meet people where they are. As a programming language enthusiast, I have explored many languages & paradigms, both in terms of practical use and underlying mechanisms. This has given me a uniquely strong ability to: implement solutions that closely match human mental models; understand solutions apart from their coded form; spot incidental complexity in code; deconstruct and re-implement complex code-bases (e.g. when migrating legacy software). As a tutor and mentor, these experiences enable me explain things in human terms, and empathize with the gap between technology and the human mind. My favorite experience as both a software engineer and mentor, is that spark of discovery or understanding while walking someone (or vice versa) through a problem or explanation. Other interests: Piano, Stargazing, Hiking, Camping, Yoga, Mindfulness, Reading, Origami, Retro gaming, Sci-fi, Horror, Dad jokes, Playing with my kids & my dogs.

Sven Pedersen

Senior data-focused polyglot software engineer. Built several business intelligence systems + predictive analytics; used NLP + machine learning for metadata enrichment, has linguistic and cultural training, built payment processing systems, used various relational SQL databases and NoSQL. Specialties: Java, Clojure, Ruby, Python, Perl, text processing, data transformation + metadata enrichment, linguistics, automation (including DevOps), pattern recognition and machine learning. Also worked on PHP, Node.js, Backbone, AngularJS, iOS apps, and several other systems

Ahmed Tarek Hasan Saleh

I’m a Senior Software Design Engineer at ASML with over 15 years of experience designing, documenting, and delivering enterprise-grade .NET solutions. What truly drives me is turning complex technical concepts into something simple, reusable, and shareable — whether through mentoring teammates, architecting scalable systems, or writing for my technical blog Development Simply Put. Over the years, I’ve been recognized for bridging engineering excellence with clarity — from developing productivity tools and mentoring engineers, to publishing articles that have been referenced by Microsoft MVPs. 💡 On my blog, I simplify software design patterns, concepts, and engineering principles so others can code smarter and faster. If you believe great software is built on great understanding — let’s connect. Website: https://DevelopmentSimplyPut.com Blog: https://DevelopmentSimplyPut.com/blog LinkedIn: https://www.linkedin.com/in/atarekhasan **Responsibilities:** ✔ Analyzing requirements and breaking them down into stories and tasks. ✔ Tasks sizing and estimation. ✔ Designing business and technical solutions. ✔ Applying best practices, design principles, and concepts (OOP, Design Patterns, SOLID, DRY, KISS). ✔ Implementing tasks into code, optimized for speed and scalability, and troubleshooting issues. ✔ Performing code reviews. ✔ Mentoring/Coaching new team members. ✔ Preparing/Presenting appealing presentations. ✔ Building Confluence Spaces and Wiki for business and technical topics. ✔ Developing productivity tools. **Achievements:** ⭐ Speak Arabic (Native or bilingual proficiency), English (Professional working proficiency). ⭐ Certified knowledge of problem solving, algorithms and data structures. ⭐ Strong communication skills. ⭐ Acknowledged mentor. ⭐ Technical writer/blogger. Check my blogging achievements (https://bit.ly/BloggingAchievements). ⭐ Own Technical Articles are used as reference by Microsoft MVP (https://bit.ly/ReferencedByMVP). ⭐ Awarded Recognition Certificates by management and colleagues.

Arup Rakshit

I am a freelance web developer working out of India. My weapons of choices are : HTML, CSS, Javascript, SQL, Ruby, Ruby on Rails, React JS. I literally spend as much hours as possible every day on coding.