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Web developer with advanced experience working on large-scale Javascript apps. Specialized in rendering and DOM performance. Personal site - [https://chrisdolphin.dev](https://chrisdolphin.dev/)
I've been teaching programming since 2018 to people of different ages. I'm specialized mostly in teaching how to start programming from scratch: basics of programming languages + basics of computer science. But I always have in mind a long-term perspective for my students and try to develop useful skills just from the start of our work.
Senior data engineer specializing in financial data infrastructure, large-scale pipeline architecture, and cloud data systems on AWS/GCP/Snowflake. I build and fix data pipelines that handle real stakes — regulatory reporting, trading infrastructure, high-volume financial data — and I have a track record of measurable improvements: full data loads from 3 weeks to 6 hours, ingest times from 45 minutes to 3, query runtimes improved 500%. Recent work: 🏦 Lead data engineer at MSRB (US federal regulator, $4T municipal bond market): 30 ETL pipelines supporting $9B+ in daily trades, pricing data availability increased 800% across 2.7M securities 📦 Data infrastructure at Trafigura: serverless pipelines processing ~500GB of multi-domain financial, industrial, and geopolitical data 📑 Greenfield SEC filing pipeline: 20 years of filings across 4,000+ companies, structured for LLM querying ⚙️ DataPraxis: container-based ingestion platform (GCE/Docker/Kubernetes) reducing ingest time from 45 minutes to 3 🌍 Catalist: Productionizing machine learning models at 1,000,000x scale and implemented Cloudera colocation -> BigQuery transtion MS Applied Mathematics & Statistics, Johns Hopkins University.
I am no longer taking new students for mentoring sessions. However, you are welcome to ask me questions of any depth in chat and I'll answer as I can. I am an assembly language expert, having mentored recently in MIPS, LC-3&4, MARIE, PEP/8&9, others. I will explain the concepts and fundamentals that you need to know. For example: how the processor works; how assembly language works; analogies for higher level languages concepts in assembly language; methodology for problem solving. While I do explanations, I don't do homework, assignments, projects, tests, quizzes, exams (practice or otherwise) or freelance. The help I offer is about concepts: knowledge of how processors work, how assembly language works, how we accomplish the same thing in assembly as in other languages, and how programmers look at problems. So, ask me something about what you want to learn: what you don't know or what you are confused about that will help you in making progress on your assignment/project or upcoming test.
AI Model Engineer, Operating System Developer, Principal Cloud & Infrastructure Architect with decades of hands-on engineering experience and 10+ years designing, modernizing, securing, and operating production AWS environments. I specialize in complex environments where **architecture, reliability, security, and hands-on troubleshooting** intersect. My work has included transforming single-server applications into highly available cloud platforms, designing Infrastructure as Code and CI/CD systems, leading zero-downtime migrations, operating mission-critical SaaS infrastructure, and supporting organizations through significant growth and ownership transitions. Many times I have served as a medium or long term technical consultant and infrastructure owner, working directly with executives, Product, Engineering, QA/Support, and business stakeholders while remaining hands-on with AWS, Linux, automation, security, and production incidents. More recently, I have applied the same production-first approach to AI infrastructure and agentic systems, building secure cloud environments and AI-enabled operational workflows rather than isolated prototypes.
Staff-level Software Architect and Forward Deployed Engineer with 12+ years building distributed systems and AI-native engineering platforms. Embedded across 35+ enterprise clients at current firm — scoping per-client requirements, coordinating 10+ engineers on features and integrations, and owning incident response end-to-end on a multi-tenant platform. Established AI-native engineering standards adopted org-wide: context files, PII safety hooks, and LLM-orchestrated release automation — cutting triage costs ~$4,600/yr and release prep by 5–7x. Track record includes a 99% latency reduction (40m → 3s) and cross-team API contract ownership. Comfortable operating in ambiguous, fast-moving environments across fintech, food-tech, aviation, and e-commerce — translating domain problems into working software without waiting for perfect requirements. You may go through some of my projects here : **[https://abhishakegupta91.github.io/](https://abhishakegupta91.github.io/)**
I'm Matei, a full-stack developer with over 10 years of experience, specializing in JavaScript, React, and Node.js. I help developers at all levels overcome challenges, from debugging complex issues to understanding core concepts. My approach is patient and tailored to your needs, ensuring you gain confidence and clarity in your coding journey. Format: - regular (long term) or one-time - for any level (beginner/intermediate/advanced) - personalized take-home tasks & resources - 45-90min sessions, up to 6hrs/day on request Availability: - 4:00-18:00 UTC on workdays - irregular on weekends - last minute or late night sessions on request (email matei@copot.eu) Technologies: - JavaScript: ESNext, NodeJS/Deno, TypeScript, React, Vue, NodeMCU, & more - Front-end Web Dev: HTML5, CSS3, responsive design, PWAs, SPAs, & more - Back-end Web Dev: Express/NextJS APIs, Python, AWS, Docker, SQL, PHP, & more - App Dev: Mac/Linux & Android, Electron, Expo, Python, Stripe, UX, & more - others: always curious about other technologies, e.g. haskell, ruby, WASM, WebGL... = Why me? I'm typically paid €100/hr by top companies, so the lower rate here means you're getting top-tier expertise at an accessible price. I enjoy mentoring because it brings variety and a more collaborative and relaxed dynamic. I have a proven track record of guiding learners from zero experience to landing high-paying jobs. My teaching adapts to your pace and goals: you'll always get honest, actionable advice, including what's realistic and what's not. If you're serious about growing your skills or career in tech, I'd be glad to support your journey.
I have a PhD in Computer Science and I have extensive experience in scientific computing. I have deep expertise in C & Matlab, and I am also very proficient with PHP, MySQL, Linux, Apache, Excel, and so on. I have completed many projects involving computational modelling, statistical analysis, experimental data analysis, and innovative algorithm design & implementation.
iOS developer, technical consultant and mentor with post-graduate teaching qualifications and Managing Director at FutureSonic Ltd, a software development agency specialising in audio technology for mobile devices. David is an expert in audio and music technology (DSP, audio signal processing, filters, effects, audio engineering etc.) and is featured mentor for Codementor and Udemy's iOS and Swift course.
I have been delivering technical training courses for over 7 years on a variety of subjects - I can help by giving full courses, pair programming to help you learn or if you have a specific problem you're trying to solve I'll work with you through it to help you resolve it and understand the solution. Outside of CodeMentor I am a Lead Engineer based in London & SF - I have experience working in large corporations & startups across Java, iOS, JavaScript & Web Technologies. ** If you belong to a group that is underrepresented in tech, and money is an issue, please ask me about reduced rates. **
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