Full Stack TypeScript Developer

Celestify Ltd.; West of England; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Remote work from anywhere

Learning & development budget

Flexible time-off

Job summary

Celestify Ltd. is seeking a Full Stack TypeScript Developer to own end-to-end features across web, mobile and AI-powered apps. You will work on frontend and backend (React, Next.js, Node.js) with a focus on type safety and scalable APIs.

In a fully remote, async-friendly team, you’ll design robust architectures and ship experiences using modern tools like Cloudflare Workers, Vercel, Drizzle, Postgres and OpenAI integrations.

Qualifications

• Deep TypeScript expertise on frontend and backend with strong type safety.
• Proven experience building scalable React apps with modern UI libraries.
• Designing clean, secure REST APIs with Express, Hono, or similar.
• Solid SQL knowledge and Postgres with ORM like Drizzle.
• Hands-on experience deploying serverless/cloud apps.
• Strong Git workflows and CI/CD automation.
• Excellent communication and ability to own features end-to-end.
• Self-motivated, collaborative and comfortable working asynchronously.
• Based in the UK or EU.

Skills

TypeScript

React

Node.js

REST APIs

Serverless / Cloud

Git & CI/CD

Client-server architecture

Communication with clients

Tools

Drizzle

PostgreSQL

Cloudflare Workers

Vercel

OpenAI API

Langchain

LlamaIndex

Docker

Job description

TypeScript React Next.js React Native Node.js Hono Postgres Drizzle Cloudflare Workers Vercel Git Docker OpenAI Langchain LlamaIndex

At Celestify, we build smart web, mobile, and AI-powered apps that help startups and businesses solve real problems. We're growing our small, fully-remote team and looking for a Full Stack TypeScript Developer who can own end-to-end features, architect scalable solutions, and drive quality across our products and client projects. If you thrive working across the stack with modern tools, writing clean and maintainable code, and enjoy collaborating directly with clients, this role is for you.

• TypeScript everywhere: backend (Node, Serverless) and frontend (React, Vite / Next.js)
• React Native for cross-platform mobile apps
• Postgres with modern ORMs such as Drizzle
• Serverless/cloud infrastructure: Cloudflare Workers, Vercel
• Git-based workflows, CI/CD pipelines, Docker containers
• AI integrations using Vercel AI SDK, OpenAI, Langchain, LlamaIndex, and similar APIs

What you bring - Must haves

• Deep TypeScript expertise on frontend and backend, with focus on type safety and robust architecture
• Proven experience building scalable React apps with Tailwind, AntD, Material, Chakra or similar UI libraries
• Designing clean, secure and scalable REST APIs with Express, Hono, or similar libraries
• Solid understanding of SQL and relational database design, preferably with Postgres and ORM frameworks such as Drizzle
• Hands-on experience deploying and maintaining serverless/cloud applications
• Strong command of Git workflows, CI/CD automation
• Exceptional communication skills; comfortable engaging regularly with clients to gather requirements and provide technical guidance
• Self-motivated with a demonstrated ability to own features or services end-to-end, from functional design through production support

Nice to haves

• React Native app development experience with focus on performance and UX
• Practical knowledge of AI integration, including OpenAI models and modern tooling such as Vercel AI SDK, Cloudflare Workers AI, Langchain, LlamaIndex, etc.
• Familiarity with workflow automation tools (Zapier, Make, n8n) and complex third-party API integrations (Slack, Microsoft Graph)
• Experience working asynchronously in distributed teams, showing discipline and strong remote collaboration habits
• Security-minded: understanding API security, authentication flows, and data privacy best practices
• Comfortable setting up and maintaining monitoring, logging, and alerting in cloud environments
• Experience working with Docker and containers in general
• Based in the UK or EU

You are...

• An excellent communicator who can translate technical concepts clearly to both clients and teammates
• Eager to explore new technologies, confident picking up unfamiliar npm packages or APIs and integrating them quickly
• A daily user of AI tools such as ChatGPT, Claude, Cursor, leveraging them to supercharge your productivity and creativity
• Experienced with "vibe coding", you understand the excitement and frustration, and you embrace the creative flow it brings
• Passionate about writing clean, maintainable, well-tested code that scales and lasts
• Curious, constantly learning, and always seeking ways to improve both yourself and the codebase
• Proactive in identifying problems early and solving them end-to-end without waiting for direction
• Collaborative and open to constructive feedback
• Motivated by working in a fast-paced, small team where your contributions have real impact

What we offer

• Remote work from anywhere
• Flexible async-friendly working hours so you can manage your own schedule
• A personal learning and development budget to support your growth
• Flexible time-off policy with a culture of trust and balance
• Paid software subscriptions, from Cursor and ChatGPT to anything else you need to do your best work
• Bonuses when you go above and beyond

After you apply, we will

• Schedule an informal chat to see if we're a good fit
• Ask you to complete a short, take-home coding test
• Invite you to a final technical interview to review the coding test
• Make you a job offer