Senior Frontend Developer (React / Next.js)

About the role
We’re looking for a strong Senior Frontend Developer to join our product development team and work on complex web applications across FinTech, Web3, marketplaces, SaaS platforms, and data-heavy admin systems.

This role has a clear growth path toward Frontend Team Lead. We’re looking for someone who is not only strong technically but also comfortable taking ownership, communicating directly with clients, and explaining technical decisions through their business impact.

As you grow into the Lead role, you’ll work directly with CTOs, founders, and C-level stakeholders, participate in architectural and scope discussions, mentor developers, and help establish frontend engineering standards.

What you’ll do
Design frontend architecture: component structure, state management strategy, and scalability principles
Build key product flows: authentication, onboarding, user accounts, payments, wallets, transaction history, dashboards, and admin panels
Work with React, Next.js, TypeScript, and JavaScript
Configure SSR/CSR for performance-sensitive and high-traffic applications
Work with REST APIs, asynchronous flows, WebSockets / SSE
Conduct code reviews, maintain quality standards, and reduce technical debt
Collaborate closely with Design, QA, Backend, and Product teams
Participate in task estimation and sprint planning
Mentor developers and contribute to technical decision-making

What we’re looking for
5+ years of commercial frontend development experience
Strong React, Next.js, TypeScript, JavaScript ES6+
Redux Toolkit / Context API, React Hooks, React Query or equivalents
Styled Components / Sass / CSS Modules
Responsive and cross-browser development
REST APIs, async flows, WebSockets / SSE
Jest and understanding of E2E testing with Cypress / Playwright
Git, code review culture, Jira or similar tools
Experience with payment integrations or financial data
Experience mentoring developers and reviewing code
Experience communicating directly with clients without a PM as the only communication layer

Communication is important
You should be comfortable communicating directly with clients and gradually taking more ownership on the business side.

We expect:
English B2+, confident spoken communication
Ability to participate in client calls independently
Ability to communicate with CTOs, founders, and C-level stakeholders in a structured and clear way
Ability to explain technical decisions, risks, trade-offs, and technical debt in business terms
Confidence to challenge a poor idea or unrealistic scope respectfully and without creating conflict
Clear written communication and documentation
Calm communication in discussions and ability to defend technical decisions when needed

AI-assisted development experience is required
We actively rely on AI in our engineering workflow, so we’re looking for hands-on experience, not just familiarity with the tools.

You should have:
Daily experience with Claude Code, Cursor, Codex, or similar agentic tools
Experience preparing context for agents: project rules, CLAUDE.md / cursor rules, MCP integrations, task decomposition
Ability to critically review AI-generated code and identify hallucinations, unsafe patterns, and unnecessary abstractions
Understanding of where AI saves engineering time and where it can create technical debt
Ability to build an effective AI-assisted workflow and potentially help the team adopt it
Ability to explain how AI-assisted development affects project timelines and cost

Growth to Frontend Team Lead
As you grow into the Lead role, your responsibilities will gradually include:
Direct client communication and calls with CTOs / founders
Presenting and defending architectural decisions, scope, and estimates
Translating business requirements into technical solutions and explaining technical risks in business language
Mentoring and onboarding developers
Establishing engineering standards and code review guidelines
Technical coordination between our team and the client’s engineers
Participation in technical interviews and candidate evaluation
Project estimation and occasional presale support

Nice to have:
Web3: WalletConnect, ethers.js / viem, wallets, smart contracts
Telegram Mini Apps
Node.js / Express / MongoDB
Storybook, design systems, UI kits
Previous Team Lead / Tech Lead experience
Presale and project estimation experience