Hire the Best Open Source Developers in Seattle, WA

I'm a software developer experienced in working remotely and building full stack, responsive, modern web applications. I've worked at a successful startup that went public (Surf Air Mobility), a FAANG company (AWS), and independently as a freelancer and for myself (see Upwork history; and I developed and maintain Documatic, a small-business web app extending Google Docs). I'm also active in open-source development; I own and maintain an open-source web app called Cost Sharing for YNAB (costsharingforynab.com, github.com/chelseaSchmidt/cost-sharing-for-ynab), and I'm a primary contributor to a web app called War of the Ring Community (waroftheringcommunity.net, github.com/sirrus233/wotr-community-website). I'm fluent in the TypeScript + React + Node stack, but I also have experience in Java, Python, and Haskell. Additionally, I have experience using GraphQL, working with SQL and NoSQL databases, containerization with Docker, and using cloud services for hosting and deployment (Google Cloud Platform and AWS).

I’m a senior full-stack web and app developer with over 25 years of experience helping startups and global enterprises build scalable, reliable, and high-performing software. I focus on clean architecture, strong communication, and delivering real business results. I specialize in React, TypeScript, Node.js, and AWS, building end-to-end solutions that are fast, secure, and easy to maintain. I also integrate AI and automation into development workflows to boost productivity and accelerate innovation. Over the years, I’ve worked with leading organizations including Expedia Group, Redox, PicMonkey, and Siris Medical, delivering projects that improved scalability, performance, and user experience. My background also includes leadership roles — mentoring developers, guiding architecture decisions, and aligning engineering strategy with business goals. Core strengths include: Full-stack development (React, Node.js, Express, TypeScript) Cloud infrastructure (AWS EC2, S3, RDS, Docker) DevOps & automation (ElasticSearch, Kafka, CI/CD) Team mentorship & technical leadership AI-assisted development & system optimization I approach every project as a partnership — understanding your goals, designing solutions that scale, and delivering them with precision. Whether you need a rapid MVP, a complex enterprise system, or long-term development support, I bring both the technical depth and the practical experience to make it happen. Let’s build something exceptional together. 📍 Based in Seattle, WA | Available for remote work

If your iOS app isn’t actively maintained, it’s already at risk. I help businesses keep their iOS apps stable, compliant, and running reliably through every iOS update — without the stress of crashes, App Store rejections, or production issues. Most apps work well at launch. Problems come later: iOS updates introduce breaking changes Bugs surface in production App Store approvals become unpredictable No one is responsible for long-term stability That’s where I come in. 🔧 What I Do I focus on keeping existing iOS apps healthy and operational: Fix crashes, bugs, and performance issues Ensure compatibility with the latest iOS versions Handle App Store submissions and rejections Provide ongoing maintenance so your app stays reliable 🧱 Core Services iOS App Maintenance & Stability Ongoing updates for new iOS releases Crash monitoring and bug resolution Prevent issues before they impact users App Health Audits Identify risks and technical debt Separate true app defects from iOS limitations Provide clear, actionable recommendations Resolve urgent production issues Fix rejected apps and submission blockers Stabilize apps that are no longer maintained App Rescues 📈 Experience 20+ years in software engineering Delivered a 99% crash-free production app (American Association of Orthodontists) Extensive experience diagnosing real-world iOS behavior Trusted across healthcare and private sector applications 🤝 When to Reach Out Your app is crashing or unstable You’re preparing for App Store submission You haven’t updated your app in months You need someone to take ownership of maintenance If that sounds familiar, feel free to reach out — I’m happy to take a look.

I'm a developer, cartographer and designer experienced in creating web maps and applications for small to medium-sized companies. From right-sized implementations custom branding to tailored interactions and user flows that integrate with the rest of your online presence. * Proficient in ArcGIS Pro, ArcGIS Online, ArcGIS Enterprise * Geospatial Data Sourcing (or bring your own) * Data Management / ETL (R, SQL, Python) * Geospatial analysis in ArcGIS, QGIS, Python, R * Cloud Services Management / Architecture (ArcGIS, AWS, Azure, Cloudflare, GCP, Github, Serverless Solutions) * Front-End Development (HTML, CSS, JavaScript, React, TypeScript, Maplibre, Mapbox, Leaflet) * Cartographic Services (Figma, Custom Stylesheets, Custom Icons / Sprites) * Full Project Management (Discovery to Hand-off) * Teaching & Curriculum Design Regular communication and sign-off at every step, let me know what you need and we'll get you there.

github.com/jonlin14/ I've been a web developer professionally for 5+ years working with JavaScript and PHP. Looking to work freelance to expand my project base - Experienced with the full development cycle of a website. - Looking mainly for smaller projects

If you’re selling a high-ticket offer - whether that’s a service, coaching program, agency package, or a tech/SaaS product - you don’t just need “more calls.” You need someone who can book qualified meetings, run sharp discovery, and close deals without overpromising what your team can deliver. That’s where I come in as a High-Ticket Sales Closer & SDR with a Full Stack / MLOps engineering background. The kinds of problems I solve Most clients I work with are agencies, founders, and service businesses who are dealing with some mix of: A pipeline full of unqualified leads and not enough sales-ready conversations. Prospects dropping after discovery calls because the closer can’t connect the offer to the prospect’s real business problem. A gap between what sales promises and what delivery can realistically do, which hurts referrals, upsells, and long-term revenue. Whether your offer is tech-heavy (SaaS, AI, platforms) or more traditional (consulting, marketing services, education, operations), I focus on clear messaging, strong discovery, and confident closing. What I actually do High-ticket closing & SDR Outbound and inbound SDR, prospecting, cold outreach, qualifying, discovery, demos, objection handling, follow-up, and appointment setting. Comfortable on Zoom and phone, running structured calls that feel consultative, not pushy. Experienced with CRM workflows, pipeline management, lead nurturing, and conversion optimization for both tech and non-tech offers. Full Stack / MLOps engineering muscle (my edge, not your requirement) 10+ years building production systems with .NET, C#, JavaScript/TypeScript, cloud-native microservices, REST APIs, and event-driven architectures. Hands-on with Azure ML, Kubernetes, Docker, CI/CD for ML, model deployment, and monitoring — I’ve worked on real-time decisioning platforms and large-scale systems. In practice, this means I can comfortably handle technical questions when your offer is complex, and still communicate in plain language when your audience is not technical. Why clients hire me I treat every call as a diagnostic, not a script reading. I can translate features into benefits and business outcomes for both tech and non-tech buyers. I understand how to keep expectations realistic, so operations, delivery, or coaching teams aren’t stuck cleaning up broken promises. If you’re running a high-ticket offer and want someone who can sell with confidence, protect your reputation, and speak fluently to both business and technical buyers, send me a message and let’s talk about your pipeline, your targets, and where you’re losing deals today.