Freelance Mern Stack Developer Jobs in Ohio (NOW HIRING)

Senior Application Developer (MERN/ GCP/ Technical Lead)Build the Future of Construction TechnologyFoundation Software is one of the fastest-growing construction software companies in the U.S. and a multi-year Northeast Ohio Top Workplace. We're seeking a Senior Application Developer who combines strong hands-on engineering skills with technical leadership, project ownership, and a passion for building modern cloud-native applications.This role focuses on the TypeScript-based MERN stack and Google Cloud Platform (GCP) while helping evolve our broader technology ecosystem.Development & ArchitectureDesign, build, and support scalable applications using MongoDB, Express.js, React, Node.js (TypeScript), APIs, and GCP.Develop modern web applications, microservices, integrations, and cloud-native solutions deployed via containers to Google Cloud Run, Cloud Functions, and Kubernetes.Lead solution design and contribute to architecture decisions.Drive modernization initiatives that improve scalability, reliability, security, and maintainability.Technical & Project LeadershipLead technical projects from design through deployment.Coordinate work across developers, product teams, and stakeholders.Facilitate architecture reviews, planning sessions, and technical decision-making.Identify and resolve technical risks, dependencies, and delivery challenges.Mentorship & CollaborationMentor developers through code reviews, coaching, and knowledge sharing.Promote engineering best practices including clean architecture, dependency injection, testing, performance, and code quality.Partner closely with Product, QA, DevOps, Architecture, and business teams.Troubleshoot complex production issues using the observability stack (Sentry, OpenTelemetry, structured logging) and drive continuous improvement.Required7+ years of software development experience.Proven experience leading software projects and influencing technical direction.Strong, current expertise with TypeScriptStrong expertise with:MongoDB (native Node.js driver; Mongoose a plus)jsReactjsHands-on experience with:Dependency injection / IoC containers (InversifyJS or similar)Redis-backed job queues (BullMQ or similar) and Google Cloud Tasks / Pub/SubAuth0 / OIDC / JWT-based authenticationSchema validation with ZodModern React tooling - Redux Toolkit, React Hook Form/Formik, and Material UI (MUI) or similar.Experience developing and deploying solutions in Google Cloud Platform (GCP), including Cloud Run, Cloud Functions, Cloud Tasks, Pub/Sub, and Secret Manager.Experience with Docker and Kubernetes for containerized service deployment.Experience building scalable web applications, APIs, microservices, and distributed systems.Experience mentoring developers and leading technical discussions.Strong communication, collaboration, and problem-solving skills.PreferredExperience as a Technical Lead, Lead Developer, or Project Lead.Experience with payments/card processing, PCI-DSS, or client-side field-level encryption.Experience with construction software, ERP systems, financial systems, or expense management solutions.Experience building or integrating expense management, AP, invoice processing, procurement, or purchasing applications.Experience with feature flag release managementExperience integrating LLMs / generative AI into production applications.Familiarity with equivalent technologies on the Azure / .NET / C# stack.Why Foundation?Influence architecture and technical direction.Lead impactful projects and mentor other developers.Work with modern TypeScript, React, and GCP technologies.Competitive compensation, strong benefits, and career growth opportunities.Award-winning culture with a collaborative, employee-focused environment. If you enjoy building modern cloud applications, leading technical initiatives, and mentoring others, we'd love to talk with you.