React Native Developer

• Proficiency in Angular (v8+) and TypeScript.
• Strong knowledge of HTML5, CSS3, and JavaScript/ES6+.
• Hands-on experience with RxJS for reactive programming.
• Experience with state management libraries like NgRx or similar.
• Familiarity with RESTful APIs and JSON data structures.
• Understanding of authentication and authorization mechanisms (OAuth, JWT).
• Experience with Angular CLI for project setup and management.
• Proficiency in browser developer tools for debugging.
• Strong experience with Jasmine, Karma, or other testing frameworks.
• Familiarity with build tools like Webpack or Vite.
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Skills Required:

• Deep expertise in modern frontend frameworks - React, Next.js, Vue, or Svelte.
• Proficiency in *TypeScript, JavaScript (ES6+), and functional programming patterns.
• Experience in state management (Zustand, Redux Toolkit, Recoil, Jotai) and component-driven architecture.
• Strong understanding of UI/UX best practices, design systems, and responsive design.
• Expertise in performance optimization, code splitting, and progressive rendering.
• Familiarity with WebAssembly (WASM), WebGL, and Three.js for high-performance or 3D interfaces.
• Understanding of API integration, GraphQL, and real-time systems (WebSockets, SSE, gRPC).
• Experience with frontend DevOps pipelines - Vite, Turborepo, CI/CD, and containerized builds (Docker).
• Familiarity with AI-assisted tools such as GitHub Copilot, Cursor, V0 by Vercel, Galileo AI, and Figma’s AI features.
• Awareness of AI-driven frontend experiences - text-to-UI systems, multimodal chat UIs, and LLM-based interface personalization.
• Bonus: Exposure to AR/VR frameworks, Unreal Web Integration, or Edge-rendered UIs (Cloudflare Workers, Deno Deploy).

Who We Are Looking For:

Upsurge Labs builds experiences that bridge humans and machines, robotics dashboards, biotech data portals, AI film interfaces, and creative tools that define the next generation of interaction.

We’re looking for a Senior Frontend Engineer who doesn’t just write code, they design experiences that move at the speed of imagination.

You should be:

• Smartworking, organized, and driven to engineer interfaces that feel alive.
• A craftsman obsessed with precision, animation, and design integrity.
• Someone who can think like a designer, structure like an architect, and execute like an engineer.
• Capable of thriving in ambiguity, where the problem isn’t defined.
• Ready for a challenging, fast-paced environment where quality matters and ‘good enough’ isn’t enough.

At Upsurge Labs, you’ll shape the visual soul of the technologies that shape the future.

We are looking for a great JavaScript developer who is proficient with React.js. Your primary focus will be on developing user interface components and implementing them following well-known React.js workflows (such as Flux or Redux). You will ensure that these components and the overall application are robust and easy to maintain. You will coordinate with the rest of the team working on different layers of the infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important.

• Developing new user-facing features using React.js

• Building reusable components and front-end libraries for future use

• Translating designs and wireframes into high quality code

• Optimizing components for maximum performance across a vast array of web-capable devices and browsers

Core responsibilities

•      Collaborate with product teams to more accurately define new features

•      Collaborate with UX in the building of a design system/component library

•      Ensure high performance of all systems developed

•      Aware of the relationship between development and business with a strong sense of ownership

•      Employ the latest techniques such as agile software development

•      Good knowledge of highly scalable server-side development

•      Basic working knowledge of Unix/Linux

•      Excellent problem solving and coding skills in Javascript (Angular/React)

•      Strong interpersonal, communication and analytical skills

•      Should have the ability to express their design ideas and thoughts

Job Brief

•      JavaScript and Typescript expertise with Angular Framework

.    Must have Monorepo experience with Nx from initial setup to CI/CD and maintenance. 

•      Experience with libraries such as bootstrap, Ag-grid, formly, observables, and ngrx

•      You enjoy working with new technologies, and are curious and energetic

•      Experience working with REST APIs

•       Good understanding about authentication and security

•      Create and maintain various unit and integration tests

•      You enjoy working in a creative and agile environment that moves fast

•      Ability and interest in providing mentorship to junior members of the team

•      Write high quality code and Conduct code reviews

•      Being resourceful and detail-oriented, along with being an outside the box thinker!

•      Experience being a great team player, who work collaborative, and brings a positive attitude

Fulfil’s software engineers develop the next-generation technologies that change how millions of customer orders are fulfilled by merchants. Our products need to handle information at a massive scale. We're looking for engineers who bring fresh ideas from all areas into our technology.

As a Front End software engineer, you will work on the ReactJS powered user interface used by Fulfil merchants to manage their back-office operations. This is mission critical software and your primary focus will be on developing user interface components and implementing them following well-known React.js workflows. You will ensure that these components and the overall application are robust and easy to maintain. In this role, you will be collaborating closely with the rest of the team working on different layers of infrastructure in an international environment. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality are important.

What You’ll Do:

• Collaborate with a small yet extraordinarily talented team of engineers to implement front-end technologies
• Develop new user-facing features using React.js and React Native
• Work closely with the Design and Product teams to translate complex technical workflows into delightful user experiences
• Define how Fulfil builds user interfaces and ensure that we’re utilizing and keeping up with modern web standards
• Continually test, measure, and iterate on the results of your work in the spirit of continuous improvement
• Write clean, reusable, and well-tested front-end code
• Help to bridge the responsibilities of the Product and Engineering teams, spending time with both on the way to launching new products
• Architect efficient and reusable front-end abstractions and systems that drive complex web applications
• Create reliable and type-safe applications with Typescript
• Build and contribute to open source projects
• Build reusable components and front-end libraries for future use
• Optimize components for maximum performance across a vast array of web-capable devices and browsers

We’re Looking for Someone With:

• 5+ years of experience as a front end engineer
• Experience in building large-scale web applications in a fast-moving team environment
• A strong understanding of UX and UI design standards
• The perfectionist’s touch on a pragmatist’s deadline: you strive for pixel-perfection and intuitive functionality
• Strong proficiency in JavaScript (2-4 Years of experience), including DOM manipulation and the JavaScript object model
• Thorough understanding of React.js and its core principles, with experience in popular React.js workflows
• Experience with common front-end development tools such as Babel, Webpack, NPM, etc
• Experience with popular testing frameworks, like Jest, Cypress, and Testing Library.
• The ability to bring any design to life with HTML and CSS, with cross browser compatibility and accessibility
• Smarts, humility, communication skills, and equal willingness to teach and learn
• Familiarity with RESTful and GraphQL APIs
• Knowledge of modern authorization mechanisms, such as JSON Web Token
• Experience in developing large client side JavaScript applications
• Familiarity with code versioning tools like GIT
• Experience with Javascript testing tools and test automation

Nice to Haves:

• Prior experience at a growth stage Internet/Software company
• Demonstrated work beyond the front-end, experienced in integrating with a wide array of back-end technologies and services (e.g. experience with Python, AngularJS)
• Experience developing large client-side applications and optimizing them for performance
• You can straddle client and server development, creating APIs that drive web apps
• You understand the intricacies of timezones
• Web optimization, performance tools, and load testing
• You maintain or contribute to an open-source project

We are looking for a React Native developer interested in building performant mobile apps on both the iOS and Android platforms. You will be responsible for architecting and building these applications, as well as coordinating with the teams responsible for other layers of the product infrastructure. Building a product is a highly collaborative effort, and as such, a strong team player with a commitment to perfection is required.

• Build pixel-perfect, buttery smooth UIs across both mobile platforms.
• Leverage native APIs for deep integrations with both platforms.
• Diagnose and fix bugs and performance bottlenecks for performance that feels native.
• Reach out to the open source community to encourage and help implement mission-critical software fixes—React Native moves fast and often breaks things.
• Maintain code and write automated tests to ensure the product is of the highest quality.
• Transition existing React web apps to React Native.

• Experience, preferably with web applications and not websites
• Experience with HTML5, CSS3, JQuery & Javascript
• Experience with JSON data structures