{"id":448056,"url":"https://alion.io/job/contentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk","title":"Senior JavaScript Engineer (m/f/d) – Focus on Web Performance & SDK","company":{"id":173231,"name":"contentpass","domain":"contentpass.net","url":"https://alion.io/company/contentpass","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Personio","truth_index":null},"role":"Frontend","role_family":"Frontend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Berlin, Germany"],"countries":["DE"],"hiring_countries":["DE"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":60000,"max_usd":125000,"period":"year","method":"role_seniority_country_cell","sample_n":14},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[],"status":"live","first_seen_at":"2025-12-22T11:11:17Z","employer_posted_date":"2025-12-22","last_verified_at":"2026-10-27T00:41:51Z","board_verified":true,"closed_at":null,"days_open":308,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":307},"description":"The Mission\nWe are an established, profitable company in the privacy and adtech space - helping publishers and media houses across Europe offer cross-publisher monetization models. Our technology powers multiple billion page impressions every month, and we’re scaling fast into new markets. We combine the best of both worlds: the stability of a profitable business and the agility and ownership mindset of a startup. Every team member has a visible impact and we encourage you to shape not just our products but also our culture.\nWe are looking for a Senior Software Engineer to take ownership of our SDK - the core component integrated into partner websites. This SDK manages communication with CMPs (Consent Management Platforms) and our stack, ensuring privacy compliance, performance, and reliability at scale. You’ll be responsible for evolving the SDK into a high-performance, secure, and extensible framework that can:\nIntegrate with additional CMPs\nUnlock access to premium content models\nPotentially detect and block 3rd-party requests, ads, and trackers \nThis role is ideal for an engineer who thrives at the intersection of web performance, browser internals, and privacy technology - someone who takes pride in writing elegant, efficient, and secure TypeScript code.\nWhat You'll Do\nOwn the design, development, and evolution of our web SDK used across publisher integrations.\nEnsure high performance, reliability and scalability for billions of monthly impressions.\nWork closely with the whole engineering and product teams to extend SDK functionality for new CMPs and features.\nDebug complex browser and integration issues across different environments.\nChampion best practices for security, maintainability and developer experience.\nCollaborate cross-functionally with other engineers and stakeholders to ship improvements quickly.\nYour profile\nRequired Skills & Experience5+ years of professional software engineering experience.\nDeep understanding of JavaScript/TypeScript and modern web APIs.\nStrong experience debugging in complex, cross-browser environments.\nSolid understanding of browser networking, cookies, privacy and security mechanisms.\nExperience building SDKs, libraries or embeddable scripts at scale.\nExcellent communication skills and ownership mindset - you ship and iterate fast.\nYou care about understanding how things work and improving them, not just completing tasks.\nStrong English communication skills in written and verbal communication - you thrive in explaining technical challenges to your peers.\nMindsetIntrinsic motivation - you care about why, not just what.\nCuriosity and eagerness to learn - you stay up-to-date with technology trends and share it with the team.\nOwnership mentality - you take responsibility and follow through.\nPragmatic problem-solver - you value clarity, simplicity, and maintainability.\nProduct-focused thinking - you consider the real-world context and user impact behind the code.\nNice-to-HaveFamiliarity with privacy tech, adtech, or CMP integrations.\nExperience with APIs and caching layers.\nFamiliarity with Node.js and modern CI/CD environments.\nInterest in performance profiling, browser automation or content blocking.\nWhy us?\nWhy You’ll Love Working HereImpact: Your work directly affects billions of web requests monthly and that makes you proud.\nOwnership: Take the lead on a mission-critical SDK with real autonomy.\nFlexibility: Remote-first culture, flexible working hours and async-friendly communication.\nGrowth: Be part of a profitable, scaling company entering new markets.\nEquity Upside: Participate in our beneficiary share program.\n Culture: A collaborative, fast-moving team where new ideas are encouraged and deployed fast.","description_format":"text","description_chars":3715,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"Germany","iso":"DE","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-09-06T08:05:16Z"},{"event":"open","at":"2026-09-19T21:40:00Z"}],"visa":[],"liveness":{"score":5,"band":"cold","label":"Long shot","p_open":1,"p_active":0.188,"p_room":0.28,"age_days":307,"expected_fill_days":35,"reasons":["conf:5","win:tail","crowd:"],"computed_at":"2026-10-26T05:57:25Z"},"pay":null,"html_url":"https://alion.io/job/contentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk","json_url":"https://alion.io/job/contentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk.json","meta":{"generated_at":"2026-10-27T02:32:18Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":1781,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-28T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":173231},"rest":"https://alion.io/mcp/rest/get_company?id=173231"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcontentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fcontentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fcontentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/contentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcontentpass-senior-javascript-engineer-mfd-focus-on-web-performance-sdk"}]}