Senior Frontend Engineer

Short summary (Job summary)

Were looking for a Senior Frontend Engineer with strong experience in (web) and React Native (mobile) to join Mokka Studios ).

You will design and build modern, scalable applications across web and mobile, integrating payments and DocuSign flows.

This is a full-remote role with a monthly compensation between USD 2,500 and 3,000, depending on experience and skills (ongoing working relationship, but as a freelancer).

Role & responsibilities

• Develop and maintain modern, responsive web interfaces using , TypeScript, TailwindCSS, SWR and Shadcn UI, based on Figma designs.
• Develop and maintain mobile applications using React Native, ensuring high performance and native-feeling UX on both iOS and Android.
• Ensure pixel-perfect implementation and adherence to the design system across web and mobile components.
• Define and evolve the frontend architecture for both web and mobile, choosing patterns and best practices for state management, performance and scalability.
• Design and implement navigation flows (routing, stacks, deep links) to provide consistent, smooth user journeys across platforms.
• Collaborate with backend engineers to design and consume APIs (REST/GraphQL): endpoints, contracts, validation, error handling, versioning and documentation.
• Integrate and maintain DocuSign workflows (templates, envelopes, signing flows, webhooks) within web and mobile applications.
• Integrate and maintain payment gateways such as Stripe (preferred) or other providers (Razorpay, Braintree, etc.), handling secure payments, webhooks and error scenarios.
• Work with Supabase (PostgreSQL, Storage) and Drizzle ORM to design and consume data models from the frontend.
• Implement robust authentication flows using BetterAuth (dbSession + cookies), ensuring security and a smooth user experience.
• Configure and maintain CI/CD pipelines (GitHub, Vercel and mobile build workflows), managing development, staging and production environments.
• Manage builds and releases of React Native apps to the Apple App Store and Google Play Store, including signing, provisioning and configuration.
• Own deployments on Vercel for web applications, ensuring reliability, scalability and traceability of releases.
• Write clean, testable and secure code, including unit and integration tests where appropriate.
• Perform code reviews, refactors and continuous improvements to keep the codebase healthy.
• Monitor and optimize performance, identifying and fixing bottlenecks and bugs before they impact users.
• Actively participate in Agile ceremonies (planning, estimations, retrospectives), helping define roadmap, milestones and sprint scope.
• Ensure technical and visual consistency across products, in close collaboration with designers, backend developers and project managers.

Preferred candidate profile (Must-Have Requirements)

• 5+ years of experience as a Frontend / Web Engineer.
• Strong hands-on experience with TypeScript and JavaScript (ES6+).
• Solid production experience with for modern web applications.
• Solid production experience with React Native for mobile apps (iOS and Android).
• Proven track record of shipping React Native apps to the App Store and Google Play (or equivalent app store release experience).
• Excellent knowledge of HTML5, CSS3, responsive design and modern CSS methodologies (TailwindCSS or similar utility-first frameworks).
• Experience with state management and data-fetching patterns (e.g. SWR, React Query or similar).
• Proven experience working with design systems and building reusable UI component libraries (Shadcn or equivalent).
• Strong experience integrating RESTful APIs and handling authentication, authorization and error states on the frontend.
• Proven, hands-on experience integrating DocuSign (or similar e-signature platforms) into production applications.
• Hands-on experience integrating payment gateways, preferably Stripe, but also other providers (Razorpay, Braintree, etc.).
• Experience with Supabase (PostgreSQL, Storage) and ORMs (preferably Drizzle) or similar backend-as-a-service stacks.
• Experience with authentication frameworks (ideally BetterAuth, or similar session/cookie-based solutions).
• Very good knowledge of Git and GitHub workflows (branching, PRs, code review, basic CI/CD).
• Experience with cloud hosting and deployment (Vercel or similar platforms).
• Familiarity with testing and validation tools (unit, integration, API testing).
• Experience working with Figma and collaborating closely with designers.
• Experience with issue tracking tools (Linear, Jira, etc.).
• Solid understanding of Agile methodologies and iterative development practices.
• Proven experience delivering projects from initial design all the way to production.
• Strong problem-solving skills and extreme attention to detail.
• Good communication skills in English, both written and spoken.