As a full-stack developer, I specialize in supporting startups and enterprises with web and mobile solutions. Here are the skills and expertise I bring to the table: ● Extensive development experience with advanced JavaScript frameworks such as ReactJS, Node.js, EmberJS, Bootstrap, and RequireJs. ● Proficiency in server-side languages like Java Spring Boot, with recent projects developed in a Microservice architecture. ● Customization of CSS frameworks like Bootstrap and Foundation using CSS preprocessors like SASS. ● Expertise in ReactJS framework, including the development of Single Page Applications (SPAs), state management with Redux and Flux, and creating custom reusable React component libraries. ● Integration of RESTful and SOAP web services for seamless communication between applications. ● Experience in creating Server-Side Rendered (SSR) apps using Next.js. ● Familiarity with various databases including MongoDB, NoSQL, MySQL, and Oracle. ● Integration of third-party APIs for authentication, maps, and payment gateways using ReactJS. ● Utilization of AWS services like Amplify and Pub/Sub in ReactJS applications. ● Extensive work with Flutter (iOS And Android Apps), having delivered 10+ mobile applications from scratch. ● Proficient in architectural patterns like BLOC, MVP, and MVVM. ● Integration expertise with in-app purchases, maps, Agora video calling SDK, websockets for multiplayer games, and chat functionalities. ● Familiarity with Firebase for application development and deployment on Play Store and App Store. ● Contributions to open source projects, specifically Flutter (iOS and Android Apps) and in-app purchase plugins. ● Plugin development experience, including day-night theme implementation Here are some notable achievements I take pride in: ● Developed a highly regarded Latin dictionary website for a renowned European publishing house. This website has been utilized by top universities worldwide. ● Provided extensive support to a UK-based digital marketing agency, contributing to the successful completion of multiple web and app projects. ● Achieved an impressive 58th rank out of 228,880 contestants in the TechGig CodeGladiator competition, showcasing my coding skills and problem-solving abilities. ● Secured the 77th rank out of 10,000 contestants in the Airtel Crack the Code competition hosted on HackerEarth, demonstrating proficiency in coding challenges. ● Globally ranked 57th in the TCS Codevita competition, a testament to my coding capabilities and competitiveness. I am eagerly looking forward to discussing your project requirements and how I can contribute to its success.

I am a certified AWS Developer with over 10 years of working experience with AWS Cloud, who specializes in server-less architectures such as ETL processes, serverless APIs, serverless websites. ETL processes: - various compute environments: from EMR, via Glue, Batch, to Lambda with focus to be config driven and as serverless as possible. - custom orchestration systems with Step Functions, Scheduled Events, On-demand, queueing and post processing - Python, PySpark, NodeJS (with Typescript) APIs: - as serverless as possible to reduce cost and development time, with ability to deploy whole API service as single Lambda function (NestJS, FastifyJS, ExpresJS, FastAPI, Flask) - Python, NodeJS (with Typescript) Serverless websites: - as serverless as possible for reports about system status, small intake forms, management tools, etc. - build whole websites with static generated content, server site rendering (NuxtJS), - Python, NodeJS (with Typescript) I prefer to use Serverless Framework as IaaC (infrastructure as a code) for deployment with a connection with GitHub Actions as a pipeline. Also, I have experience with and I am open to use other deployment tools such as: AWS CDK, SAM, Terraform, etc. I also have experience designing DynamoDB tables (one table design principle) and connecting them with Lambdas as data producers, and creating DynamoDB Streams with Lambdas as event processors (which could've been useful in your project). Let's talk about your project needs and use my 10 years of working experience with AWS. Tomasz

Interested in opportunities revolving around Alexa Skill development, IoT hardware design and software development, Serverless Computing and Amazon Web Services. Five published Alexa Skills. Five more skills in development or beta. Assisted in the development of AWS Certification Examinations by serving as a subject matter expert. Certifications: Amazon Solution Architect - Associate, Certified Amazon Developer - Associate Technical Proficiencies: Database Systems and Methods: MySQL 5.X, AWS DynamoDB CMS Platforms: WordPress, Joomla, Concrete5 Languages: PHP v7.x, HTML5, CSS3, Node JS, JavaScript, BASH, AWS CLI, ASK CLI, Alexa ISP, NodeMCU Libraries and Frameworks: jQuery, jQuery, AWS SDK, Alexa SDK IoT Devices: ESP8266MOD, ESP-12E, AtMega328, SPI ST7735S 128x160 TFT Displays, OLED 128x64 Displays Iot Protoboards: Ardiuino Uno, Adafruit Huzzah Other Experience and Skills: Electronic circuit design, electronic circuit CAD and circuit board fabrication. On Premise Tools: Full electronics bench with power supplies, signal generators and oscilloscopes. 300x180 CNC, 1500x1500 CNC. Full surface mount station including video scope reworks station and oven. Software Tools: Linux, Open Source. FreeCAD, KiCAD, VS Code, Inkscape.

I help SaaS startups scale on AWS securely while cutting infrastructure costs by 30-50%. If you are worried about your cloud spend or security posture, I provide the architectural roadmap to fix it. Why hire me? I bring the expertise of a Fractional CTO at a flexible engagement. While I have a history of hands-on execution (which keeps my skills sharp), my focus is now on high-level architecture, security audits, and scalability strategies that save you thousands in the long run. 1. Scalability: Designed systems handling 10k+ concurrent users. 2. Cost Optimization: Reduced monthly AWS bills for clients by implementing auto-scaling and spot instances. 3. Security: SOC2/HIPAA compliance readiness for fintech/healthtech.

Top Rated Plus | 100% Job Success Score Full Stack Development & Salesforce Architecture, From MVP to Production at Scale If your project demands a digital product that performs under real load, integrates cleanly with Salesforce, and won't require a costly rebuild in a year, you're in the right place. As a Full Stack Developer working alongside a certified Salesforce Developer, our team combines senior engineering (React, Node.js, Python) with 9x certified Salesforce architecture to deliver complete, production-ready business systems. We don't hand off separate pieces, we build the entire stack as one cohesive solution. Agency Snapshot 10+ years in production. 250+ projects shipped. 15,000+ development hours. As your Full Stack Developer, I own the full product lifecycle, from frontend UX and component architecture to backend services, cloud infrastructure, and real-time CRM synchronization handled by our Salesforce Developer. Every decision is made with your business goals, not just technical preferences, in mind. Typical client outcomes 45-65% faster load times and page rendering, even on legacy codebases that were actively bleeding users before the rebuild 30-50% fewer manual operations through targeted automation, replacing repetitive workflows with background jobs and smart triggers 40% faster reporting, data sync, and API response, through query optimization, caching layers, and efficient pipeline architecture 35-50% reduction in post-launch bugs and technical debt, since clean architecture at the start costs less than emergency fixes later Platforms built to handle 10x traffic growth without structural rewrites Core Services Full Stack Web, Mobile & SaaS Development As a Full Stack Developer I build React, TypeScript, JavaScript frontends with clean component architecture and optimized state management. Backends in Python (Django, FastAPI) and Node.js, with RESTful and GraphQL APIs designed for scale. SaaS platforms, fintech dashboards, transaction systems, admin panels, and SEO-optimized landing pages. Cross-platform mobile with React Native, sharing logic with your existing web ecosystem. AI/LLM integration: GPT-powered dashboards, intelligent UI flows, chatbots, and automated analytics. Salesforce Developer Services & Enterprise Integration Our Salesforce Developer handles custom Apex logic, advanced Flow automation, and high-performance Lightning Web Components. Secure REST/SOAP and OAuth2 integrations keep your Full Stack Developer-built web apps in real-time sync with Salesforce. Experience Cloud portals with custom frontend UX backed by Salesforce data. Large Data Volume (LDV) architecture: indexing, archiving, and sharing model configuration. DevOps, Security & Cloud Infrastructure Scalable, secure cloud environments on AWS, GCP, and Heroku. Automated CI/CD pipelines via Docker and GitHub Actions (web) and SFDX/Copado (Salesforce). How We Work Discovery: we define goals, user flows, and constraints before writing a line of code. Architecture: database models, API layers, and service boundaries designed upfront by your Full Stack Developer. Development: Full Stack Developer and Salesforce Developer teams work in sync; your CRM and web app behave as a single system. QA & Performance: stability, security compliance, and API uptime validated under peak load. Post-Launch: continuous optimization; most clients see 35-45% efficiency gains within 90 days. Production Track Record 99.98% API & integration uptime Up to 2.5x system throughput under traffic surges 52% reduction in manual data handling via automation Up to 40% savings on cloud infrastructure and technical debt Industries Healthcare, FinTech, SaaS & Enterprise B2B, eCommerce, AI, Data & EdTech. As a Full Stack Developer I have worked across all these industries with real production systems behind each one. SaaS is my primary focus with 40+ platforms shipped, from early-stage MVPs to enterprise systems with complex billing and multi-tenant architecture. In Healthcare I have delivered 20+ products focused on data privacy and compliance. FinTech accounts for 15+ projects including payment systems and transaction monitoring, several built alongside our Salesforce Developer for CRM-linked billing. B2B solutions account for 30+ dashboards, portals, and automation projects. EdTech accounts for 20+ builds, from LMS platforms to learning tools. I've also delivered 10+ eCommerce platforms, 10+ Logistics solutions, and 25+ Real Estate projects. Leadership & Ownership I lead our Full Stack Developer and Salesforce Developer team, handling project management myself so there's no gap between coding, CRM integration, and delivery. 55+ long-term clients. 100% Job Success Score. I take personal ownership of your architecture, no gaps between frontend, backend, and CRM. Ready to discuss your project? Let's schedule a short discovery call.

I help startups and product teams build fast, scalable, production-ready software — without technical debt slowing them down. With 12+ years of experience as a Senior Full Stack Developer, I specialize in solving the problems that delay launches and frustrate teams: unstable APIs, slow performance, brittle legacy systems, unclear architecture, and gaps between frontend and backend execution. Whether you're launching a new product, modernizing an existing platform, or scaling a backend to handle real-world traffic, I deliver clean and reliable implementations that reduce rework and help teams move faster with confidence. What I Deliver Best Backend Systems That Scale 🔹API design and implementation (REST) 🔹Performance optimization and troubleshooting 🔹Resilient services and clean architecture 🔹Microservices and event-driven systems Java Backend Development: Spring Framework, Spring Boot, Spring MVC Node.js Backend Development: ExpressJS, NestJS, NextJS (API routes), SailsJS Serverless Backend Development: AWS Lambda + API Gateway Cloud Architecture & Event-Driven Systems (AWS) 🔹 Queue-based processing using SQS 🔹 NoSQL storage and high-throughput reads/writes using DynamoDB 🔹 File storage and data pipelines using S3 🔹 Event routing using EventBridge 🔹 Compute workloads using EC2 when needed 🔹 Email and notification workflows using SES Frontend Application 🔹 Angular, React, and Next.js development 🔹 Modern UI frameworks (Tailwind, Mantine UI, Bootstrap) 🔹 Responsive, clean, and maintainable interfaces 🔹 Reusable components and scalable UI structure Databases 🔹 SQL: PostgreSQL, MySQL 🔹 Supabase (Auth, database, storage) 🔹 NoSQL: DynamoDB 🔹 Schema design, migrations, indexing, and performance tuning Secure, Connected Systems 🔹 Authentication and authorization (JWT, RBAC, Auth0, Supabase Auth) 🔹 Stripe integrations for payments and subscription workflows 🔹 Secure API integrations between internal and third-party services DevOps & Deployment Confidence 🔹 AWS deployments and cloud infrastructure support 🔹 Docker containerization 🔹 Vercel deployments 🔹 CI/CD automation using GitLab and Jenkins 🔹DevOps & Deployment Confidence I use GitHub Copilot and Cursor AI daily to improve development speed, strengthen test coverage, and catch edge cases early — while ensuring architecture and technical decisions remain thoughtful and well-designed. Why Clients Hire Me ✅ I deliver systems that stay reliable in production ✅ I turn complex requirements into clear, working features ✅ I write clean, maintainable code that scales with the product ✅ I communicate clearly, proactively, and transparently ✅ I can jump into existing codebases and improve them fast If you need a developer who can own features end-to-end, stabilize your backend, and help your team ship faster with confidence — let’s talk.

I am serving as a Full Stack developer and have worked on comprehensive applications for different market verticals in last 7 years. My core expertise has been delivering bespoke solutions that meet the client's requirements. Here's a quick brief about my technical skills: - MEAN/MERN Stack (Node.js, Express, Angular.JS, MongoDB, ReactJS). - RESTfull APIs and GraphQL. - Responsive Design. - Version Control - Git, SVN. - Photoshop, UI/UX, Graphics Designing. - Experience using third party APIs. - Developing jank free websites that load faster. I am capable of assisting my clients with entire development cycle starting from requirements gathering, application GUI, application front-end and back-end development. I have developed simple to complex web application using ReactJS, Angular, NodeJS, MongoDB, ExpressJS. As a full stack developer, am responsible for writing server-side web application logic and the front end part too. I develop back-end components, connect the application with the other (often third-party) web services, and integrate with the front end components of the application.

CRM : SALESFORCE, HUBSPOT, MONDAY.COM,, ZOHO, KONNEKTIVE, SUITE, JOBNIMBUS AND OTHER OPEN SOURCE CRM. Odoo ERP Microsoft SQL SSIS ETL Developer : MS SQL Server, SSDT, SQL Agent Jobs, Linked Servers and SSIS. Full Stack Skills At A Glance: • LAMP, MEAN, MERN, NERD, Django, RoR Stack • PHP, Python, ASP.NET, Node.js, Ruby, JavaScript ES6-8, TypeScript • Laravel, Symfony, CodeIgnitor, Yii • MySQL, MongoDB, DynamoDB, PostgreSQL, MSSQL, Firebase, Parse Server • Angular, React JS, Vue.js, MeteorJS, ExtJS • React Native, Redis, Redux, Redux-Saga, GraphQL • Next.js, Nuxt.js, GatsbyJS, Jekyll and Hugo. • HTML5, CSS3, jQuery, Ajax, Bootstrap, Semantic UI • Responsive Design, REST API • Cordova, Ionic, PhoneGap, Xamarin, Electron • Phaser, LimeJS, ThreeJS, WebGL, Cocos2D, Unity3D • Facebook, Twitter, Google, YouTube API • Trello, Pivotal, Jira Scrum&Kanban, Confluence, Asana • Git, SVN, Github, Gitlab, Bitbucket

I help startups and growing businesses build, improve, and scale modern web applications. With 6+ years of experience in full-stack development, I specialize in building reliable backend systems, scalable APIs, cloud infrastructure, and production-ready applications. While my strongest expertise is backend engineering, I also work across the full stack to deliver complete solutions when needed. Clients typically work with me when they need someone who can quickly understand an existing codebase, solve difficult technical problems, and move features to production with confidence. 🚀 Core Expertise 🟢 Frontend • React.js • Next.js • TypeScript • JavaScript • HTML / CSS • Tailwind CSS 🔵 Backend • Node.js • NestJS • Express.js • Fastify • REST APIs • GraphQL • Authentication & Authorization • Webhooks & Third-party Integrations 🟣 Cloud & Infrastructure • AWS (S3, EC2, Lambda, RDS, CloudWatch) • Azure (VM, Blob Storage, Functions, Service Bus) • Docker • CI/CD Pipelines • Production Deployments 🟠 Databases • PostgreSQL • MySQL • MongoDB • Redis • Prisma ORM 💡 What I Usually Help Clients With ✅ Full stack web application development ✅ Backend architecture and API development ✅ SaaS platform development ✅ Payment and subscription integrations ✅ Database design and optimization ✅ Cloud deployment and infrastructure ✅ Debugging and production issue resolution ✅ Performance optimization ✅ Refactoring and modernization of existing systems ✅ Long-term product development 🤝 What You Can Expect Working With Me 🎯 Clear and proactive communication 🎯 Clean and maintainable code 🎯 Fast understanding of existing systems 🎯 Practical engineering decisions 🎯 Ownership mindset and reliable delivery I focus on building software that is scalable, maintainable, and aligned with business goals—not overengineering. Whether you need to build something from scratch, improve an existing application, or solve complex technical challenges, I’d be happy to help. Let’s discuss your project.

I am a result driven Cloud DevOps and DevSecOps Engineer with over 15 years of experience and till the date I have developed a deep understanding of cloud computing and DevOps methodologies. I am proficient in working with Cloud platforms such as: -𝐀𝐖𝐒, 𝐀𝐳𝐮𝐫𝐞, 𝐆𝐂𝐏, 𝐚𝐧𝐝 𝐎𝐫𝐚𝐜𝐥𝐞 𝐂𝐥𝐨𝐮𝐝. Adding onn I have also experienced other cloud platforms such as -𝐈𝐁𝐌 𝐂𝐥𝐨𝐮𝐝, 𝐀𝐥𝐢𝐛𝐚𝐛𝐚 𝐂𝐥𝐨𝐮𝐝, 𝐚𝐧𝐝 𝐃𝐢𝐠𝐢𝐭𝐚𝐥𝐎𝐜𝐞𝐚𝐧. In my previous projects I have experienced various Infrastructure-As-Code tools such as- 𝐓𝐞𝐫𝐫𝐚𝐟𝐨𝐫𝐦 𝐚𝐧𝐝 𝐂𝐥𝐨𝐮𝐝𝐅𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧. And I have deployed various serverless architectures using- 𝐀𝐖𝐒 𝐋𝐚𝐦𝐛𝐝𝐚, 𝐀𝐳𝐮𝐫𝐞 𝐅𝐮𝐧𝐜𝐭𝐢𝐨𝐧𝐬, 𝐚𝐧𝐝 𝐆𝐨𝐨𝐠𝐥𝐞 𝐂𝐥𝐨𝐮𝐝 𝐅𝐮𝐧𝐜𝐭𝐢𝐨𝐧𝐬. Adding onn I have expertise in network and security technologies such as- 𝐕𝐢𝐫𝐭𝐮𝐚𝐥 𝐏𝐫𝐢𝐯𝐚𝐭𝐞 𝐂𝐥𝐨𝐮𝐝𝐬 (𝐕𝐏𝐂𝐬), 𝐅𝐢𝐫𝐞𝐰𝐚𝐥𝐥𝐬, 𝐕𝐏𝐍𝐬, 𝐚𝐧𝐝 𝐈𝐝𝐞𝐧𝐭𝐢𝐭𝐲 𝐚𝐧𝐝 𝐀𝐜𝐜𝐞𝐬𝐬 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 (𝐈𝐀𝐌) 𝐬𝐞𝐫𝐯𝐢𝐜𝐞𝐬. Over the years, I have worked on a variety of projects and I have expertise in deploying and managing containerized applications using- 𝐊𝐮𝐛𝐞𝐫𝐧𝐞𝐭𝐞𝐬 𝐚𝐧𝐝 𝐃𝐨𝐜𝐤𝐞𝐫. Adding onn I’ve also experienced other container orchestration tools such as- 𝐍𝐨𝐦𝐚𝐝, 𝐌𝐞𝐬𝐨𝐬, 𝐚𝐧𝐝 𝐒𝐰𝐚𝐫𝐦. Previously I have built and managed various secure infrastructure using- 𝐂𝐈/𝐂𝐃 𝐭𝐨𝐨𝐥𝐬 𝐬𝐮𝐜𝐡 𝐚𝐬- 𝐉𝐞𝐧𝐤𝐢𝐧𝐬, 𝐂𝐢𝐫𝐜𝐥𝐞𝐂𝐈, 𝐚𝐧𝐝 𝐆𝐢𝐭𝐋𝐚𝐛. 𝐂𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐚𝐭𝐢𝐨𝐧 𝐦𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 𝐭𝐨𝐨𝐥𝐬 𝐬𝐮𝐜𝐡 𝐚𝐬 𝐀𝐧𝐬𝐢𝐛𝐥𝐞, 𝐏𝐮𝐩𝐩𝐞𝐭, 𝐚𝐧𝐝 𝐂𝐡𝐞𝐟. 𝐂𝐥𝐨𝐮𝐝 𝐝𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 𝐬𝐮𝐜𝐡 𝐚𝐬- 𝐀𝐦𝐚𝐳𝐨𝐧 𝐑𝐃𝐒, 𝐀𝐳𝐮𝐫𝐞 𝐒𝐐𝐋 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞, 𝐆𝐨𝐨𝐠𝐥𝐞 𝐂𝐥𝐨𝐮𝐝 𝐒𝐐𝐋, 𝐚𝐧𝐝 𝐎𝐫𝐚𝐜𝐥𝐞 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐂𝐥𝐨𝐮𝐝 𝐒𝐞𝐫𝐯𝐢𝐜𝐞. 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 𝐦𝐨𝐧𝐢𝐭𝐨𝐫𝐢𝐧𝐠 𝐚𝐧𝐝 𝐥𝐨𝐠𝐠𝐢𝐧𝐠 𝐬𝐮𝐜𝐡 𝐚𝐬- 𝐍𝐚𝐠𝐢𝐨𝐬, 𝐏𝐫𝐨𝐦𝐞𝐭𝐡𝐞𝐮𝐬, 𝐄𝐋𝐊, 𝐒𝐩𝐥𝐮𝐧𝐤. Adding onn I’ve experienced other monitoring and logging tools such as Zabbix, Grafana, Graylog, and Fluentd. + Also I’m familiar with Agile Methodologies: • Git • Scrum • Jira / Kanban • Slack