Hire the Best Test-Driven Development Specialists in California

I have over five years of experience in backend development and integration work. Within this time I have had multiple jobs where I worked diligently with diverse groups of people with different skills and needs. Helping companies create applications and API ecosystems to control the flow of data in their organization and make sure everything is running efficiently. I have a fluid understanding of the following topics and if I do not have an answer I will figure out a solution. Skills include but are not limited to: back end development using Java , integration work using Dell Boomi or Mulesoft, and test driven development to make sure your application works as intended.

Full-stack developer based in San Francisco (PST). I take founders from idea to a live, production app, fast, and with senior-level execution. In the past year I've shipped 5 products end-to-end: • ChekBack - a receipt-cashback app • PhotoOffice - an AI passport-photo service • ChessTourism - a chess-tournament platform • Pluto - a field-service management system for home-service companies • MotoSocial - a social network for motorcyclists Each one went from concept to deployment, including auth, payments, integrations, and infrastructure. Why clients work with me: • US-based, real-time overlap with your business hours • Native, clear English on calls and in writing • Senior delivery - I ship working software, not just plans • I stay with you until your app is published - I never leave you alone with your issues or concerns • Warranty after delivery - if something breaks on my work, I fix it, no extra charge Core stack: React, React Native, Next.js, TypeScript, Node.js, PostgreSQL. Also: Python (FastAPI/Django), Expo, Redis, AWS/Hetzner/Cloudflare, CI/CD, REST & GraphQL, CRM and third-party integrations. Best fit for: founders and startups who need an MVP or full product built right, the first time. Send me your idea and I'll reply with a rough scope and timeline. No charge.

Top-Rated QA Tester with 100% Job Success Score. I specialize in manual testing for websites and mobile apps — finding the bugs that automated tools miss. I deliver clear, organized bug reports with exact steps to reproduce, so your dev team can fix issues fast. Fast turnaround, thorough testing, zero fluff.

I’m a QA professional with 15+ years of experience in software testing, starting from manual QA, moving into automation, and now evolving into a QA Generalist in the era of AI. ##What I can help you with • Build or improve QA processes from scratch, helping teams move from chaos to structured and scalable quality practices • Implement and support AI-assisted testing workflows and CI/CD quality processes • Design and build QA orchestrations for AI systems, including experience with multi-agent architectures and AI-driven workflows • Evaluate and validate AI outputs, addressing hallucinations, bias, inconsistency, and performance risks • Ensure AI systems are reliable, safe, and aligned with business needs, using both automated checks and human-in-the-loop approaches to prevent production issues • Bring strong domain understanding into testing where AI alone is not enough • Design and optimize quality strategy, focusing on impact rather than just test execution • Be a reliable and friendly addition to any team, easy to work with and supportive of others:) ##How I work today (AI + QA) When I start a new project, I focus on understanding your product, your goals, and what quality means specifically for you: • I start by understanding your needs, expectations, priorities, and budget, as every project is different and it is important for me to align with your goals and pain points • I connect to your tools (Jira, Linear, or similar) and use AI tools like Claude Code to quickly understand the product, workflows, and requirements • I create initial test documentation (test cases, checklists, or test scenarios) using AI tools to speed up the process while keeping it structured and relevant • After test cases are prepared, I perform testing manually and/or automated using AI tools (mostly Playwright with AI support (Claude), but I am flexible depending on your needs) • I validate and audit AI-generated tests and outputs to ensure correctness and alignment with real product behavior • I integrate testing into CI/CD pipelines (GitHub Actions, Azure DevOps, Jenkins) with AI support •I perform additional testing when needed, including cross-browser, cross-platform, accessibility, performance, security testing, also using AI tools where applicable •I handle reporting using AI tools to provide clear and actionable insights •For routine QA actions, I also utilize AI tools, for example for bug creation, log analysis, and test data generation •Where needed I rely on my experience and apply human judgment to manually verify complex scenarios •I pay special attention to high-risk AI systems, making sure there is human oversight, good data quality, and proper risk evaluation. ##Tools & Technologies (most used) AI & GenAI Tools: Claude Code, OpenClaw, ChatGPT, Codex, CodeWhisperer, Amazon Q, SageMaker Test Automation: Playwright, Cypress, Selenium, Robot Framework, Rest Assured Performance Testing: JMeter, BlazeMeter, Taurus, JProfiler CI/CD & DevOps: GitHub Actions, Jenkins, Azure DevOps, AWS CodePipeline Cloud & AWS Services: AWS (S3, Glue, SageMaker, Device Farm), QuickSight API & Testing Tools: Postman, REST APIs Databases: MongoDB, PostgreSQL, MySQL, DynamoDB, SQL Server Programming & Scripting: Java, JavaScript Test Management & Collaboration: Jira, Linear Other: Linux, Git, Cross-browser and cross-platform testing tools I also can help with talent visa support for tech professionals, including EB-1/O-1 guidance, recommendation letters, expert opinion letters, and profile positioning.

⭐ Top 3% of QA Freelancers on Upwork Platform ⭐ Top Rated Plus since 2018 I’m a highly-detailed Software Quality Assurance Tester, with over 12+ years of hands-on experience testing web, mobile, and desktop applications. I'm passionate about testing, finding solutions, and helping companies create rock-solid reliable digital products free of bugs 🐞🐞🐞. My specialties include: • Mobile/Web Application Testing • Manual testing • Mobile App Testing • Detailed Test Plan & Test Case Development • Back-end Database & API Testing: PostMan • JIRA Available Physical Testing Devices =========================== Apple: iPhone XR, iPhone 12 Pro, iPad, Macbook Air, Macbook Pro Android: Android - Samsung Galaxy Desktop: Windows Desktop, Windows Laptop, OS X - Mac BrowserStack Account with instant access to 3000+ desktop browsers and real mobile devices Project Management and Defect Tracking Tools ================================== JIRA, Trello, SharePoint, Bugzilla, Asana, Notion, Confluence,

I am a Los Angeles-based Professional with 17+ years of work experience where I took roles of Full Stack Developer, Project Manager, Solutions Architect, Team Lead, DevOps Engineer, Project Consultant, Cloud Consultant, Cloud Architect, etc. I have a rich portfolio of Web and Mobile Apps(both iOS and Android). ***************** I have led Projects for well-known companies like Sony Pictures, Paramount Pictures, 20th Century Fox, Prince Cruise Line(PCL), Masimo, and Creative Artist Agency. ***************** As a Full Stack Developer/Team Lead/Project Manager/Solutions Architect I have extensive experience with a Web application, Mobile Applications, Desktop Application Development, UI/UX Design, Tech Support, Cloud Architect, and Consulting Projects involving technologies like Wordpress, PHP, Java, Python, C#, Javascript, React, Angular, Node.js, Express.js, Shopify, Swift, Objective-C, React Native, AWS, GCP, Microsoft Azure, etc. - Build and develop the project team to ensure maximum performance, providing purpose, direction, and motivation. - Lead projects from requirements definition through deployment, identifying schedules, scopes, budget estimations, and project implementation plans, including risk mitigation. - To coordinate internal and external resources, ensuring projects remain within scope, schedule, and defined budgets, in collaboration with project staff from various functional departments. - Analyze project progress and, when necessary, adapt scope, timelines, and costs to ensure that the project team adheres to project requirements. - Establish and maintain relationships with appropriate client stakeholders, providing day-to-day contact on project status and changes As DevOps/Cloud Engineer I have extensive experience in designing, implementing, and maintaining complex Cloud-based infrastructure with a focus on security, scalability, and high availability. AWS Services: Deployment Automation: Proficient in automating deployment processes using AWS CloudFormation, Terraform, and Ansible to reduce errors and improve speed. Continuous Integration and Delivery: Skilled in setting up CI/CD pipelines using AWS CodePipeline, AWS CodeBuild, and Jenkins for automated build, test, and deployment processes. Monitoring and Alerting: Capable of setting up monitoring systems using AWS CloudWatch, Prometheus, and Grafana to identify performance issues proactively. Security and Compliance: Knowledgeable in implementing security best practices and automated compliance checks using AWS Config and AWS Security Hub. Cost Optimization: Experienced in optimizing AWS spending using tools like AWS Cost Explorer, AWS Budgets, reserved instances, spot instances, and auto-scaling. Microsoft Azure Services: DevOps Strategies: Proficient in designing and implementing effective DevOps strategies using Microsoft Azure for continuous integration, delivery, and deployment. Infrastructure Provisioning and Configuration: Experienced in provisioning and configuring Azure infrastructure using tools like Azure Resource Manager (ARM) templates and Terraform. Continuous Integration and Continuous Deployment (CI/CD): Skilled in establishing CI/CD pipelines using Azure DevOps for automated build, test, and deployment processes. Automation and Orchestration: Capable of automating tasks and processes using PowerShell, Azure CLI, Azure Automation, and Azure Logic Apps to streamline operations. GCP Services: Deployment Automation: Proficient in automating deployment processes using tools like Google Cloud Deployment Manager and Terraform to ensure consistency and reliability. Continuous Integration and Delivery: Skilled in setting up CI/CD pipelines using Cloud Build and Jenkins on GCP for automated testing, building, and deployment of applications. Monitoring and Alerting: Capable of implementing monitoring and alerting systems using Stackdriver Monitoring and Stackdriver Logging to identify and resolve issues promptly. Security and Compliance: Knowledgeable in implementing security controls and compliance standards using GCP Identity and Access Management (IAM) and Security Command Center. Cost Optimization: Experienced in optimizing costs on GCP using tools like Cost Explorer and Budgets, as well as utilizing features like sustained use discounts and preemptible VMs to minimize expenses. *****************