Hire the Best Test-Driven Development Specialists
in the United States

Safeguard digital identities by designing and implementing robust Single Sign-On solutions, automating identity onboarding and offboarding, and enforcing least-privilege access controls across complex environments. Clients benefit from scalable, resilient, and highly secure IT solutions delivered through deep technical expertise, industry-leading information security best practices, and disciplined Agile execution—ensuring strong system performance while reducing operational and security risk. Solutions to Help You Succeed with Your IAM & Cloud Operations ✔ Identity Platforms That Scale With Confidence Benefit from enterprise-grade identity solutions proven to support 35M+ users, ensuring reliability in high-volume environments. ✔ Accelerated and Secure Cloud Adoption Reduce risk and complexity through deep Microsoft Azure architecture and engineering expertise, enabling faster modernization without compromising security. ✔ Solutions Informed by Global Best Practices Leverage international consulting experience to meet diverse compliance, and operational requirements. ✔ Faster Delivery With Lower Project Risk Achieve valued outcomes sooner through SAFe®-aligned Agile delivery, designed to adapt as requirements evolve. ✔ A Transparent, Trusted Technology Partner Gain a responsive partner committed to clear communication, accountability, and long-term success—not just project completion. Let’s connect to explore how we can secure your digital identities and accelerate innovation. We look forward to working with you.

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.

Hey, I am a Software QA Engineer with 3+ years of hands-on experience testing web and mobile applications across multiple domains. I have worked across the full software testing life cycle from analyzing requirements and writing detailed test plans to executing test cases, managing defects, and supporting production releases. Whether I am testing a complex end-to-end business workflow, validating API responses, or performing cross-browser and mobile compatibility checks, I bring a structured and detail-oriented approach to every project. What I can help you with: -Test planning and QA documentation -Functional, regression, smoke, and exploratory testing -API testing using Postman and Swagger -Mobile testing on Android and iOS (real devices and simulators) -UI/UX and cross-browser validation -SQL-based backend data verification -Defect tracking and reporting using JIRA -End-to-end business workflow testing -UAT support and production release validation Why work with me: -Full STLC ownership — from requirement review and test design through UAT support and go-live validation -Cross-functional collaborator — experienced working alongside developers, product managers, and UX designers in Agile/Scrum teams -Web and mobile covered — tested on real Android and iOS devices as well as simulators -Thorough documentation — every test case, defect report, and QA process clearly written for full traceability -Fast onboarding — I adapt quickly to new systems, workflows, and project environments If you need a reliable QA professional who communicates clearly, documents thoroughly, and takes quality seriously from day one, let's talk. I am ready to help you reduce release risk and ship software your users can trust.

As a Senior Lead Engineer with 15 years of experience in Automation, Performance QA, and enterprise software quality, I specialize in testing AI-powered, SaaS, web, mobile, and financial platforms for reliability, accuracy, scalability, and user experience. I have built and led high-performing QA teams, designed scalable automation frameworks using Selenium, Playwright, Cypress, and API testing tools, and implemented shift-left QA strategies that reduced defect leakage to under 5%. My expertise now extends into AI product quality, including AI chatbot testing, prompt validation, AI output evaluation, hallucination checks, transcription workflow testing, generated-content validation, API testing, regression testing, and end-to-end validation of AI-enabled user flows. I focus on testing not only whether the software works, but whether the AI behavior is accurate, consistent, explainable, and useful for real users. I bring strong experience in functional, API, integration, performance, and regression testing, along with CI/CD pipeline integration and structured defect reporting. If your AI product needs a QA professional who can combine traditional software testing discipline with AI-focused validation, I can help improve release confidence, reduce risk, and deliver a more reliable user experience. Let’s discuss how I can help elevate the quality of your AI-powered product.

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. *****************

Hi, I’m Mike, a Senior Frontend Engineer with 10+ years of experience building scalable, high-performance web applications using React, Next.js, and Angular. I work with SaaS companies, startups, and enterprise teams to turn designs into fast, maintainable, and user-friendly interfaces that scale with real business needs. Core Expertise & Technologies Frontend Development - JavaScript (ES6+), TypeScript, HTML5, CSS3 - React, Next.js, Angular, Gatsby - Component-driven architecture and design systems - Responsive and accessible UI development - Styling & Collaboration - Styled-components, CSS Modules, Tailwind, Bootstrap - Git, GitHub / GitLab, agile team workflows - Code Quality & Performance - I focus on clean, modular, and maintainable code with strong attention to performance, accessibility, and long-term scalability. - Test-Driven Development using Jest, Mocha, and Sinon - End-to-end testing with Selenium and Protractor - Cross-browser and cross-device validation - AI & LLM Integration Experience In addition to frontend development, I have hands-on experience integrating AI and LLM features into production web applications, including: - Chat and support interfaces using OpenAI / GPT APIs - Context-aware UIs for summarization, classification, and content generation - Secure prompt handling, token optimization, and function calling - AI-assisted workflows and internal tooling I focus on practical, secure, and performant AI integrations that improve real user experiences. What I Bring to the Table - Modern, scalable React and Next.js frontends - Pixel-perfect implementation from design specs - Performance and UX improvements - Clear communication and reliable delivery - Frontend development with optional AI integration expertise Clients looking for a senior React or Angular developer, especially with AI integration experience, will find my skill set well suited to modern web applications. Let’s connect and discuss how I can help bring your product to life. Mike Taatgen