{"id":2007746,"url":"https://alion.io/job/craftman-data-developpeur-front-end-ab-testing-hf","title":"Développeur Front-End A/B Testing (H/F)","company":{"id":3908437,"name":"Craftman Data","domain":"craftmandata.com","url":"https://alion.io/company/craftman-data","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Frontend","role_family":"Frontend","seniority":null,"employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Marseille, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":37000,"max_usd":76000,"period":"year","method":"role_country_seniority_unknown","sample_n":46},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"A/B Testing","optional":false},{"name":"JavaScript","optional":false},{"name":"Vue.js","optional":false}],"status":"live","first_seen_at":"2026-09-30T10:02:42Z","employer_posted_date":null,"last_verified_at":"2026-09-30T10:02:42Z","board_verified":false,"closed_at":null,"days_open":35,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":35},"description":"Pour un grand compte international du secteur transport & logistique, nous recherchons un(e) développeur(se) Front-End expert(e) en expérimentation et campagnes marketing digitales, au sein d'une équipe e-commerce dédiée à l'optimisation du parcours client (conversion et engagement).\nMission : 3 mois, démarrage octobre 2026. Présence sur site à Marseille 2 jours par semaine.\nVos missions :\nConcevoir et développer des variantes de tests A/B (bannières, popups, intégrations dynamiques) en JavaScript vanilla\n\nConfigurer et déployer les campagnes dans AB Tasty (segmentation, ciblage, répartition du trafic, tracking d'événements)\n\nManipuler le DOM de façon performante et non intrusive, compatibilité avec l'existant (Vue.js)\n\nOptimiser les performances (MutationObserver, debouncing/throttling, cache, nettoyage mémoire)\n\nDévelopper des fonctionnalités multilingues avec détection automatique de la langue\n\nAnalyser les résultats des tests (significativité statistique) et proposer des améliorations\n\nDocumenter (README en anglais) et maintenir les campagnes, compatibilité cross-browser\n\nProfil recherché\nProfil confirmé ou senior. Vous justifiez d'une expérience significative en développement front-end orienté expérimentation / CRO, avec une maîtrise avancée d'AB Tasty et du JavaScript vanilla. Rigoureux(se), autonome et force de proposition, vous savez argumenter vos recommandations auprès des équipes marketing et produit. Anglais courant indispensable.\nContrat : CDI ou CDD, poste salarié uniquement (pas de freelance ni de sous-traitance).","description_format":"text","description_chars":1554,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-07T12:33:56Z"}],"visa":[],"liveness":{"score":3,"band":"cold","label":"Long shot","p_open":0.6,"p_active":0.147,"p_room":0.35,"age_days":34,"expected_fill_days":5,"reasons":["seen:34","velocity","win:tail"],"computed_at":"2026-11-04T06:34:25Z"},"pay":null,"html_url":"https://alion.io/job/craftman-data-developpeur-front-end-ab-testing-hf","json_url":"https://alion.io/job/craftman-data-developpeur-front-end-ab-testing-hf.json","meta":{"generated_at":"2026-11-04T15:59:26Z","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":24466,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-05T00:00:00Z"}},"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":3908437},"rest":"https://alion.io/mcp/rest/get_company?id=3908437"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcraftman-data-developpeur-front-end-ab-testing-hf"},{"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%2Fcraftman-data-developpeur-front-end-ab-testing-hf"},{"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%2Fcraftman-data-developpeur-front-end-ab-testing-hf"},{"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/craftman-data-developpeur-front-end-ab-testing-hf\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcraftman-data-developpeur-front-end-ab-testing-hf"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":2007746}},{"tool":"search_jobs","arguments":{"company":"craftmandata.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":2007746},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. Docs: https://alion.io/developers"}}