{"id":2942864,"url":"https://alion.io/job/seedtag-senior-software-engineer","title":"Senior Software Engineer","company":{"id":53828,"name":"Seedtag","domain":"seedtag.com","url":"https://alion.io/company/seedtag","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Teamtailor","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["Madrid, Spain","Barcelona, Spain","Hamburg, Germany","London, United Kingdom","Milan, Italy","Paris, France"],"countries":["ES","DE","GB","IT","FR"],"hiring_countries":["DE","FR","GB","BE","IT","NL","ES"],"hiring_countries_total":7,"salary":null,"salary_estimate":{"min_usd":59000,"max_usd":122000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":14},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Embeddings","optional":false},{"name":"Go","optional":false},{"name":"LLM","optional":false},{"name":"Node JS","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"TypeScript","optional":false},{"name":"Computer Vision","optional":true},{"name":"JavaScript","optional":true},{"name":"Machine Learning","optional":true},{"name":"Terraform","optional":true}],"status":"live","first_seen_at":"2026-10-20T13:24:14Z","employer_posted_date":"2026-10-20","last_verified_at":"2026-10-21T13:45:32Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"We’re looking for a Senior Software Engineer to join our tech team and help build the future of neuro-contextual advertising at global scale.\nWho We Are\nAt Seedtag, our mission is to transform advertising by proving that effectiveness and user privacy can truly coexist.\nAs the leading Neuro-Contextual Advertising Company, we combine Artificial Intelligence, Natural Language Processing, Computer Vision, and neuroscience to understand not only what content is about, but how it makes people feel and what they intend to do next.\nOur proprietary AI, Liz, enables brands to connect with audiences across the open web and Connected TV without cookies or user tracking. Founded in 2014 by two ex-Googlers, Seedtag has grown to 500+ Seedtaggers in 17 countries, backed by €250M in funding, and operates today as a global ad-tech leader.\nIf you enjoy solving complex engineering challenges and building AI-driven systems at scale, you’ll feel right at home here.\nYour Challenge\nAs our Senior Software Engineer, you will join our five-person Contextualization Platform team, building the technology that understands content across the open web, Connected TV (CTV), and in-app environments. You'll develop high-performance backend systems and turn AI innovations into production solutions that power contextual advertising at scale.\nBackend Development: Design, build, and maintain high-throughput, low-latency services using Golang, supporting an RTB ecosystem handling over 500K queries per second.\n\nAI & ML Integration: Transform Data Science experiments, LLM capabilities, and AI-driven ideas into reliable production systems.\n\nScalable Architecture: Develop APIs, services, and data pipelines that process large volumes of contextual data efficiently.\n\nInnovation & Experimentation: Prototype, test, and iterate on new approaches to contextual understanding across OpenWeb, CTV, and in-app environments.\n\nPlatform Evolution: Contribute to architectural decisions and continuously improve system performance, reliability, and scalability.\n\nCross-Functional Collaboration: Work closely with Data Scientists, AI teams, and Product Managers to deliver solutions with measurable business impact.\n\nEngineering Excellence: Write clean, maintainable code while balancing quality, speed, and evolving business priorities.\n\nOur Core Values\nOutcome over Output\nWe measure success by impact and value, not by volume of features or lines of code.\nFailure Is Allowed, Learning Is a Must\nExperimentation is key to innovation. We test early, iterate often, and learn fast.\nWe Are All Scouts\nWe take ownership and leave things better than we found them.\nWe Are Data-Driven\nData informs our decisions and helps us continuously improve our systems and results.\nTech Stack\nYou'll work with technologies supporting Seedtag's scalable backend systems and AI-powered capabilities.\nOur stack includes:\nCore Language: Go / Golang.\n\nAdditional Languages: Python, Node.js, TypeScript.\n\nArchitecture: Distributed systems, microservices, high-throughput and low-latency services, APIs.\n\nAI & Machine Learning: LLM APIs, embeddings, RAG, ML model integration.\n\nInfrastructure & Observability: Cloud infrastructure, monitoring, Infrastructure as Code (e.g. Terraform).\n\nDomain: OpenWeb, CTV, in-app contextualisation, RTB.\n\nWhat You’ll Need to Succeed\nStrong hands-on Golang experience, building and maintaining backend services in production.\n\nSolid understanding of distributed systems, particularly high-throughput or low-latency architectures.\n\nHands-on experience with LLM APIs, embeddings, or RAG, alongside a strong interest in AI technologies.\n\nExperience with cloud infrastructure, observability, and production system monitoring.\n\nFamiliarity with Infrastructure as Code principles and tools.\n\nStrong problem-solving skills and a pragmatic approach to delivering reliable, maintainable software.\n\nAbility to work autonomously, adapt to changing priorities, and collaborate effectively with technical and non-technical stakeholders.\n\nIt Would Be a Plus If You\nHave experience with Python, Node.js, or TypeScript.\n\nHave worked in AdTech, particularly with RTB, OpenRTB, or CTV.\n\nHave experience processing large-scale data or building real-time advertising systems.\n\nWhy Join Seedtag?\nA key moment of growth with real ownership and global impact.\n\nFlexible work model with 100% remote or hybrid options.\n(Remote contracts available in Spain, Italy, UK, Belgium, Netherlands, France, and Germany.)\n\nContinuous learning through a learning platform and optional language classes.\n\nA supportive, trust-based culture that values well-being.\n\nTeam activities and opportunities to connect beyond work.\n\nAdditional Perks\nHome office setup budget up to €1,000\n\nPaid trips to our HQ in Madrid\n\nMacBook Pro M3\n\nReady to Join the Seedtag Adventure?\nAt Seedtag, we create an environment where everyone can thrive. If you need accommodations during the hiring process, let us know and we’ll ensure a positive experience.\nSend us your CV and let’s build the future of neuro-contextual advertising together.","description_format":"text","description_chars":5067,"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":["Apple Macbook","Continuous learning","Flexible schedule","Home office"],"hiring_locations":[{"name":"Germany","iso":"DE","kind":"country"},{"name":"France","iso":"FR","kind":"country"},{"name":"United Kingdom","iso":"GB","kind":"country"},{"name":"Belgium","iso":"BE","kind":"country"},{"name":"Italy","iso":"IT","kind":"country"},{"name":"Netherlands","iso":"NL","kind":"country"},{"name":"Spain","iso":"ES","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Artificial Intelligence","Advertising"],"lifecycle":[{"event":"open","at":"2026-10-20T17:53:16Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":0,"expected_fill_days":45,"reasons":["conf:7","velocity","win:early"],"computed_at":"2026-10-21T05:46:15Z"},"pay":null,"html_url":"https://alion.io/job/seedtag-senior-software-engineer","json_url":"https://alion.io/job/seedtag-senior-software-engineer.json","meta":{"generated_at":"2026-10-22T00:33:45Z","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":825,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-23T00:00:00Z"}},"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":53828},"rest":"https://alion.io/mcp/rest/get_company?id=53828"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fseedtag-senior-software-engineer"},{"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%2Fseedtag-senior-software-engineer"},{"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%2Fseedtag-senior-software-engineer"},{"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/seedtag-senior-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fseedtag-senior-software-engineer"}]}