Engineering Manager, Frontend (Maternity Cover)

Cleeng; Poznań; Remote; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Flexible working hours

100 % paid sick leave

Events, celebrations

International team in Amsterdam, Pozna

SaaS products with global clients

Ownership culture

AI at the heart of our innovation

Job summary

Cleeng is seeking an experienced Frontend Engineer to join a remote-first, agile team working across Amsterdam, Poznan, Manila, and NYC. You’ll own features end-to-end, stay hands-on in React and TypeScript, and mentor others while shaping how we run our agent harness for frontend work.

You will lead the code quality and security of changes, driving CI gates and clear documentation. English proficiency is essential.

Qualifications

• Agentic development as your primary workflow with Claude Code/OpenCode on production code.
• Configured harness: agent instructions, subagents, MCP servers, tool permissions, CI checks for agent output.
• 6+ years building production frontend applications with deep React and advanced TypeScript.
• Critical review of generated code—knowing when to accept, correct or reject, and why.
• Node.js and BFF patterns, REST API design, automated testing with Playwright and Jest.
• Technical leadership without needing a manager title: mentoring, setting standards, owning a codebase area, leading a squad through decisions.
• Ownership of features from ticket to production, with a quality and reliability mindset.
• Clear written communication and autonomy in a remote-first, agile team; English at C1

Responsibilities

• Ship code yourself — stay hands-on in React and TypeScript, take real tickets, and drive them with agents rather than supervising from a distance.
• Own the agent harness for frontend — Claude Code and OpenCode configuration, agent instruction files, subagents, MCP servers, hooks and permissions.
• Raise the team's agentic ceiling — pair, demo, and improve the docs, conventions, tests and tooling agents work from, so the whole squad ships faster and not only you.
• Stay the engineer in the loop — you own correctness, design quality and security of what the group merges, whoever or whatever wrote the first draft.
• Hold delivery for the frontend scope of your squad: sprint commitments, estimates, and the trade-off calls between speed and quality.
• Run the group day to day — 1:1s, standups, unblocking. Light-touch and temporary by design; you are not being hired to write process
• Own what you ship: launch with dashboards and alerts, monitor, and take part in the operational health of your squad's domain
• Take a structured handover from our Lead Frontend Engineer before the leave starts, and hand it back cleanly on her return

Skills

React

TypeScript

Frontend

Code review

Mentoring

Agile

REST API

CI/CD

Tools

Next.js

AWS

Playwright

Jest

Job description

• Agentic development as your primary workflow: daily, fluent use of Claude Code, OpenCode or an equivalent harness on production code, including multi-step tasks and parallel sessions
• Evidence you have configured the harness, not only used it: agent instructions, subagents, MCP servers, tool permissions, CI checks for agent output
• 6+ years building production frontend applications, with deep React and advanced TypeScript
• Critical review of generated code — knowing when to accept, correct or reject, and why
• Node.js and BFF patterns, REST API design, automated testing with Playwright and Jest
• Technical leadership without needing a manager title behind you: mentoring, setting standards, owning a codebase area, leading a squad through decisions
• Ownership of features from ticket to production, with a quality and reliability mindset
• Clear written communication and autonomy in a remote-first, agile team; English at C1

Requirements

• Agentic development as your primary workflow: daily, fluent use of Claude Code, OpenCode or an equivalent harness on production code, including multi-step tasks and parallel sessions
• Evidence you have configured the harness, not only used it: agent instructions, subagents, MCP servers, tool permissions, CI checks for agent output
• 6+ years building production frontend applications, with deep React and advanced TypeScript
• Critical review of generated code — knowing when to accept, correct or reject, and why
• Node.js and BFF patterns, REST API design, automated testing with Playwright and Jest
• Technical leadership without needing a manager title behind you: mentoring, setting standards, owning a codebase area, leading a squad through decisions
• Ownership of features from ticket to production, with a quality and reliability mindset
• Clear written communication and autonomy in a remote-first, agile team; English at C1

Nice to have

• Experience with Next.js and server-side rendering
• Familiarity with AWS or other cloud environments
• Experience in subscription, billing or payments domains

Responsibilities

• Ship code yourself — stay hands-on in React and TypeScript, take real tickets, and drive them with agents rather than supervising from a distance
• Own the agent harness for frontend — Claude Code and OpenCode configuration, agent instruction files, subagents, MCP servers, hooks and permissions. Treat "the agent could not figure this out" as a signal about our codebase and context, not only about the agent
• Raise the team's agentic ceiling — pair, demo, and improve the docs, conventions, tests and tooling agents work from, so the whole squad ships faster and not only you
• Stay the engineer in the loop — you own correctness, design quality and security of what the group merges, whoever or whatever wrote the first draft. Set the review bar for agent-written code and back it with CI gates
• Hold delivery for the frontend scope of your squad: sprint commitments, estimates, and the trade-off calls between speed and quality
• Run the group day to day — 1:1s, standups, unblocking. Light-touch and temporary by design; you are not being hired to write process
• Own what you ship: launch with dashboards and alerts, monitor, and take part in the operational health of your squad's domain
• Take a structured handover from our Lead Frontend Engineer before the leave starts, and hand it back cleanly on her return

Benefits

• Flexible working hours and form of employment;
• 100 % paid sick leave within the agreed limits;
• Events, celebrations
• Work with an international team of well - rounded experts in Amsterdam (HQ), Poznan, Manila, NYC. 16 nationalities and counting!
• Work on unique, market-leading, SaaS products, with clients all over the world: Europe, Asia, Americas;
• Work closely with people who value diversity, hard work, friendly relationships and love their jobs, and get all together to the next level!
• Join a company where engineering and business teams work as true partners, shaping the future of subscriber management technology
• Be part of a culture that values ownership, impact, and learning, with AI at the heart of our innovation strategy