{"id":1399527,"url":"https://alion.io/job/prosapient-search-ai-retrieval-lead","title":"Search & AI Retrieval Lead","company":{"id":685515,"name":"proSapient","domain":"prosapient.com","url":"https://alion.io/company/prosapient","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":null},"role":"AI/ML","role_family":"AI/ML","seniority":"lead","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":["London, United Kingdom"],"countries":["GB"],"hiring_countries":["GB"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":95000,"max_usd":189000,"period":"year","method":"role_seniority_country_cell","sample_n":31},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Embeddings","optional":false},{"name":"Feature Store","optional":false},{"name":"GCP","optional":false},{"name":"Gemini","optional":false},{"name":"Google BigQuery","optional":false},{"name":"Knowledge Graph","optional":false},{"name":"LLM","optional":false},{"name":"OpenAI","optional":false},{"name":"Python","optional":false},{"name":"Recommender Systems","optional":false},{"name":"Semantic Search","optional":false}],"status":"live","first_seen_at":"2026-09-28T14:46:15Z","employer_posted_date":"2026-09-28","last_verified_at":"2026-11-11T21:13:28Z","board_verified":true,"closed_at":null,"days_open":44,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":44},"description":"Every day, somewhere in the world, important decisions are made. Whether it is a private equity company deciding to invest millions into a business or a large corporation implementing a new strategic direction, these decisions impact employees, customers, and other stakeholders.\nConsulting and private equity firms come to proSapient when they need to discover knowledge to help them make great decisions and succeed in their goals. It is our mission to support them in their discovery of knowledge.\nWe help our clients find industry experts who can provide their knowledge via interview or survey: we curate this knowledge in a market-leading software platform; and we help clients surface knowledge they already have through expansive knowledge management.\nAs our Search & AI Retrieval Lead, you’ll define how structured data, semantic understanding, and intelligent systems come together to power discovery across our platform. From knowledge graphs to LLM-driven enrichment and recommendation systems, you’ll be at the forefront of building something genuinely cutting-edge - with real impact on how our users experience and navigate information.\nWe can accommodate remote working for this role.\nThe key duties of this role will include:\nSearch Architecture Strategy:\nEvaluate and define the future search stack (technology selection is part of the role). \nDesign a scalable, cloud-native search architecture from first principles. \nDecide between and combine approaches such as: \nKeyword search \nVector search \nHybrid retrieval \nGraph-based retrieval \nLLM re-ranking \nDesign indexing, data modeling, and ranking strategies. \nDefine measurable relevance and quality frameworks. \nKnowledge Graph & Intelligent Retrieval:\nDesign and implement a Knowledge Graph architecture modelling entities and relationships. \nDefine graph schema, linking strategies, and enrichment workflows. \nCombine graph-based signals with semantic search and ranking models. \nBuild extraction pipelines on top of frontier models (OpenAI, Gemini). \nDevelop modern recommendation systems leveraging structured + unstructured data. \nData & Cloud Infrastructure (GCP-first):\nArchitect retrieval pipelines on Google Cloud Platform (GCP). \nDesign data pipelines and feature stores using BigQuery or alternative analytical systems. \nEnsure scalability, observability, and cost efficiency. \nBuild production-grade systems, not experiments. \nRequirements\n5+ years building and scaling production search or retrieval systems. \nStrong experience designing search architectures, not just operating them. \nExperience evaluating and selecting search technologies. \nExperience with semantic search and embeddings-based retrieval. \nExperience building pipelines on top of frontier LLMs (OpenAI, Gemini). \nStrong Python skills. \nExperience leading technical initiatives in mid-sized teams. \nExperience working with cloud-native systems (preferably GCP). \nBenefits\nTenure Gifts - Vouchers, extra holiday and sabbaticals for each year of employment. \nHealth insurance through Vitality \nEmployee Assistance Programme - Access to a health and wellbeing service that offers personalised advice and support from specialist teams. \nEnhanced Maternity & Paternity pay. \nAnnual Leave - 25 days + bank holidays which includes a week's closure over the Christmas period to fully reset. \nMyMindPal app - Online support for mental fitness that helps people to stress less and enjoy life more \nCorporate Events - From quarterly gatherings to our annual winter & Summer parties, we love to celebrate, collaborate and have fun together! \nWe are committed to building an inclusive workplace - did you know that marginalized groups are less likely to apply to jobs unless they meet every requirement listed? If you are interested in the above role, but don’t necessarily tick every box, we encourage you to apply anyway - this role could still be a great match! Take a look at our diversity statement here.","description_format":"text","description_chars":3949,"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":["Annual leave","Equity","Health insurance"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Market Research"],"lifecycle":[{"event":"open","at":"2026-09-28T14:46:15Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"adverts_offering_sponsorship_24m":0,"sanctioned_now":false,"evidence":"Licensed UK visa sponsor (Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker","cap_exempt":false,"checked_at":"2026-11-11T07:38:50+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":{"score":45,"band":"ok","label":"Likely open","p_open":1,"p_active":0.816,"p_room":0.55,"age_days":43,"expected_fill_days":36,"reasons":["conf:0","win:tail"],"computed_at":"2026-11-11T05:49:22Z"},"pay":null,"html_url":"https://alion.io/job/prosapient-search-ai-retrieval-lead","json_url":"https://alion.io/job/prosapient-search-ai-retrieval-lead.json","meta":{"generated_at":"2026-11-11T23:29:34Z","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":46758,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-12T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"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":685515},"rest":"https://alion.io/mcp/rest/get_company?id=685515"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fprosapient-search-ai-retrieval-lead"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"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%2Fprosapient-search-ai-retrieval-lead"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"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%2Fprosapient-search-ai-retrieval-lead"},{"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/prosapient-search-ai-retrieval-lead\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fprosapient-search-ai-retrieval-lead"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":1399527}},{"tool":"search_jobs","arguments":{"company":"prosapient.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":1399527},"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. 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