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Frontend Developer

Zellerfeld · Hamburg · Active · Personio

Job facts

Field	Value
Company	Zellerfeld
Title	Frontend Developer
Normalized title	-
Department / team	Software / Permanent Employee
Location	Hamburg
Work model	-
Employment type	Full Time
Salary	-
Status	active
ATS provider	Personio
Posted / first seen	2026-06-02 / 2026-06-03
Changed / last seen	2026-06-03 / 2026-06-06

Related slices

Page	What it contains	Open
Company jobs	Active postings from Zellerfeld.	Open
Company breakdowns	Role, location, ATS, and work model facets for this company.	Open
ATS provider jobs	Active postings observed through Personio.	Open
Provider filtered search	The same provider as a filtered job collection.	Open
Department jobs	Active postings in Software.	Open
Lifecycle events	Open, update, close, and reopen events for this posting.	Open
Original posting	Canonical source or apply URL captured from the ATS.	Open

Linked records

Company	Zellerfeld
Source	b1cbec90-c3ad-42de-b72c-a7521edd7996
ATS provider	Personio

Description

Your mission You’ll be part of a small team of software developers building the factory of tomorrow. Your job will be to refactor and optimize existing software and the development of new tools and services from footscan via production to the consumer. As a part of our development team, you will find solutions for problems you never heard of and extend your knowledge daily. What you'll do Drive frontend architecture across our three product surfaces, making decisions about patterns, boundaries, and shared infrastructure that hold up over time Own features end-to-end: from the design conversation through implementation, production rollout, and the inevitable debugging session when something behaves differently on the factory floor than it did in staging Lead on performance, scalability, and observability. Core Web Vitals on the consumer side, realtime responsiveness on the hardware-adjacent side, and the instrumentation that lets us know which is broken Apply frontend security rigor. Not just "we use auth tokens," but a working understanding of XSS, CSRF, CSP, dependency risk, and the everyday vulnerabilities that ship to production when nobody's watching Navigate ambiguity: translate vague product, hardware, or operational needs into technical direction, and know when to ship a fast solution versus invest in a durable one Collaborate directly with hardware engineers on the production-side UIs and with operations on scanning and in-store experiences. The feedback loop is short and the requirements are real Mentor other frontend developers, review code with intent, and help establish the engineering practices that scale with the team Your profile Senior-level React and TypeScript experience, with a track record of owning non-trivial frontend systems in production Demonstrated ability to make architectural decisions about patterns, abstractions, and where to draw the line between shared and bespoke Production debugging experience across the full path: browser, API contract, network, and infrastructure. You've been the person who actually found the problem Performance and scalability work on real systems. Not just Lighthouse scores, but render performance, bundle discipline, data-fetching strategy, and caching Frontend security awareness beyond auth-token plumbing. You understand the common attack surface and how to avoid expanding it Comfort with ambiguity and the judgment to make decisions when requirements aren't fully formed Nice to have Experience with realtime, hardware-adjacent, or kiosk/in-store frontends Manufacturing, production, or operational-tooling context 3D, WebGL, or product-visualization experience (Three.js, R3F) PWA and/or native (React Native, Capacitor) experience Background contributing to design systems or frontend platform work Background We care about what you can do, not where you learned it. Formal CS background, bootcamp, apprenticeship, serious open-source contributions, or a strong portfolio of shipped work, all valid signals. Why us? At Zellerfeld, you will find a multidisciplinary team of engineers, SW and HW specialists, entrepreneurs, designers, and students with a common passion. We embrace contrarian thinking, humility, pushing limits, and improving ourselves. We utilize a flat hierarchy, and we want your voice to be heard. We also care about bonding because we want to be a tight-knit community, so be prepared to spend quality time with everyone, including the CEO! As a company specializing in both hardware and software, we value close collaboration within our team. Therefore, we are seeking candidates who can join us at our office in Hamburg.

Full job record

Job ID	d0417081fd883dc9ad2bad979913b0fd8a41229d
Org ID	8ae2b7f6-dc93-460c-90c9-49a8dc134fec
Source ID	b1cbec90-c3ad-42de-b72c-a7521edd7996
Board ID	b1cbec90-c3ad-42de-b72c-a7521edd7996
Provider	personio
Provider Job Key	2655020
Title	Frontend Developer
Normalized Title	—
Status	active
Active	yes
Location Text	Hamburg
Department	Software
Team	Permanent Employee
Employment Type	full_time
Workplace Type	—
Remote Policy	—
Country	Hamburg
Region	—
City	—
Salary Raw	—
Salary Min	—
Salary Max	—
Salary Currency	—
Salary Period	—
Source URL	https://zellerfeld.jobs.personio.com/job/2655020?language=en
Apply URL	https://zellerfeld.jobs.personio.com/job/2655020?language=en
First Seen At	2026-06-03 12:36:26Z
Last Seen At	2026-06-06 07:51:55Z
Last Checked At	2026-06-06 07:51:55Z
Last Changed At	2026-06-03 12:36:26Z
Inactive At	—
Source Posted At	2026-06-02 15:57:15Z
Source Updated At	—
Raw Payload Uri	s3://job-postings-prod-raw-590183727216/raw/provider=personio/board=zellerfeld.com/date=2026-06-06/2026-06-06T07-51-54-958Z-928bb7128ac81473053ef4f0ed8a6308ea487f6745e0c405fa0225a176efc8b3.json

Event Fields

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  "source_hash": "961bee60c00e7c1fd29a8da5fc8de5bdd23d52a8da3d79dc49683192ce7571d0",
  "last_changed_at": "2026-06-03T12:36:26.079Z",
  "active_status": "active"
}

Parsed Structured

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  "location": {
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    "city": null,
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    "country": "Hamburg",
    "is_remote": false,
    "confidence": 0.8
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  "launch_scope": {
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Extensions

{}

Native Structured

{
  "id": "2655020",
  "name": "Frontend Developer",
  "office": "Hamburg",
  "keywords": [],
  "schedule": "full-time",
  "createdAt": "2026-06-02T15:57:15+00:00",
  "seniority": "experienced",
  "department": "Software",
  "occupation": "software_and_web_development",
  "subcompany": null,
  "employmentType": "permanent",
  "jobDescriptions": [
    {
      "name": "Your mission",
      "value": "<p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">You’ll be part of a small team of software developers building the factory of tomorrow. Your job will be to refactor and optimize existing software and the development of new tools and services from footscan via production to the consumer. As a part of our development team, you will find solutions for problems you never heard of and extend your knowledge daily.</span></p>"
    },
    {
      "name": "What you'll do",
      "value": "<ul style=\"margin-top:0;margin-bottom:0;\"><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Drive frontend architecture across our three product surfaces, making decisions about patterns, boundaries, and shared infrastructure that hold up over time</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Own features end-to-end: from the design conversation through implementation, production rollout, and the inevitable debugging session when something behaves differently on the factory floor than it did in staging</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Lead on performance, scalability, and observability. Core Web Vitals on the consumer side, realtime responsiveness on the hardware-adjacent side, and the instrumentation that lets us know which is broken</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Apply frontend security rigor. Not just \"we use auth tokens,\" but a working understanding of XSS, CSRF, CSP, dependency risk, and the everyday vulnerabilities that ship to production when nobody's watching</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Navigate ambiguity: translate vague product, hardware, or operational needs into technical direction, and know when to ship a fast solution versus invest in a durable one</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Collaborate directly with hardware engineers on the production-side UIs and with operations on scanning and in-store experiences. The feedback loop is short and the requirements are real</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Mentor other frontend developers, review code with intent, and help establish the engineering practices that scale with the team</span></p></li></ul>"
    },
    {
      "name": "Your profile",
      "value": "<ul style=\"margin-top:0;margin-bottom:0;\"><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Senior-level React and TypeScript experience, with a track record of owning non-trivial frontend systems in production</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Demonstrated ability to make architectural decisions about patterns, abstractions, and where to draw the line between shared and bespoke</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Production debugging experience across the full path: browser, API contract, network, and infrastructure. You've been the person who actually found the problem</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Performance and scalability work on real systems. Not just Lighthouse scores, but render performance, bundle discipline, data-fetching strategy, and caching</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Frontend security awareness beyond auth-token plumbing. You understand the common attack surface and how to avoid expanding it</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Comfort with ambiguity and the judgment to make decisions when requirements aren't fully formed</span></p></li></ul><br><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:700;font-style:normal;text-decoration:none;\">Nice to have</span></p><ul style=\"margin-top:0;margin-bottom:0;\"><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Experience with realtime, hardware-adjacent, or kiosk/in-store frontends</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Manufacturing, production, or operational-tooling context</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">3D, WebGL, or product-visualization experience (Three.js, R3F)</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">PWA and/or native (React Native, Capacitor) experience</span></p></li><li style=\"list-style-type:disc;font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\"><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">Background contributing to design systems or frontend platform work</span></p></li></ul><br><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:700;font-style:normal;text-decoration:none;\">Background</span></p><br><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">We care about what you can do, not where you learned it. Formal CS background, bootcamp, apprenticeship, serious open-source contributions, or a strong portfolio of shipped work, all valid signals.</span></p>"
    },
    {
      "name": "Why us?",
      "value": "<p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">At Zellerfeld, you will find a multidisciplinary team of engineers, SW and HW specialists, entrepreneurs, designers, and students with a common passion. We embrace contrarian thinking, humility, pushing limits, and improving ourselves. We utilize a flat hierarchy, and we want your voice to be heard. We also care about bonding because we want to be a tight-knit community, so be prepared to spend quality time with everyone, including the CEO!</span></p><br><p style=\"line-height:1.38;text-align:justify;margin-top:0pt;margin-bottom:0pt;\"><span style=\"font-size:11pt;font-family:Arial, sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;text-decoration:none;\">As a company specializing in both hardware and software, we value close collaboration within our team. Therefore, we are seeking candidates who can join us at our office in Hamburg. </span></p>"
    }
  ],
  "occupationCategory": "it_software",
  "recruitingCategory": "Permanent Employee"
}

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