{"id":2843047,"url":"https://alion.io/job/gramian-consulting-group-senior-software-engineer-node-js-kafka-2","title":"Senior Software Engineer (Node.js, Kafka)","company":{"id":5702,"name":"Gramian Consulting Group","domain":"gramianconsultinggroup.com","url":"https://alion.io/company/gramianconsultinggroup","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Paris, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":51000,"max_usd":86000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":173},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"JavaScript","optional":false},{"name":"MySQL","optional":false},{"name":"Node JS","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Redis","optional":false},{"name":"CI/CD","optional":true},{"name":"Docker","optional":true}],"status":"live","first_seen_at":"2026-10-19T09:52:14Z","employer_posted_date":"2026-10-19","last_verified_at":"2026-10-21T01:33:18Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"Gramian Consultancy is a boutique consultancy specializing in IT professional services and engineering talent solutions. With a strong background in software engineering and leadership, we help companies build high-performing teams by matching them with professionals who truly fit their needs.\nAbout the client\nOur client is a leading player in the online gaming and betting industry, operating one of the largest poker and sports betting platforms in Europe. Their platform serves hundreds of thousands of active users monthly and relies on highly scalable, real-time distributed systems designed to handle massive traffic volumes with high availability and low latency.\nThe company combines strong technical excellence with a fast-moving product environment and offers engineers the opportunity to work on complex distributed architecture challenges at scale.\nAbout the Role\nWe are looking for an experienced Senior Backend Engineer to join the Poker engineering team and contribute to the design, development, and optimization of highly scalable microservices powering a large-scale real-time gaming platform.\nYou will work on distributed, event-driven systems handling high-throughput traffic and real-time messaging workloads, while collaborating closely with infrastructure, frontend, data, and security teams.\nThis role is ideal for engineers passionate about backend architecture, scalability, distributed systems, and high-performance platforms.\nContract: PERMANENT - CDI\nModel: Onsite, 4 days week!\nLocation: Paris, France (75007)\nHiring Process: 4 interviews - HR screening, 2 Technical Interviews, Final Meeting and Offer Discussion\nNOTE: high preference for candidates who attended CPGE scientifiques - Classes Préparatoires aux Grandes Écoles scientifiques.\nKey Responsibilities\nDesign and evolve the architecture of distributed backend systems \nDevelop highly available and scalable microservices \nBuild and maintain APIs and data models \nWork on real-time event-driven systems with high throughput requirements \nImplement unit, integration, and end-to-end testing \nParticipate in code reviews and technical discussions \nDeploy and maintain services in AWS environments \nMonitor, troubleshoot, and optimize platform performance \nContribute to architecture and technical documentation \nCollaborate with Frontend, Data, Infrastructure, Security, and Product teams\nRequirements\nSignificant experience in developing back-end services on a high-traffic platform (10K+ req/s)\nSignificant experience with load balancing, high availability, scaling, caching, database, and storage issues\nProficiency in event-driven distributed architectures\nProficiency in Redis or Kafka (data structures, pub/sub, streams, pipelines)\nProficiency in relational databases (MySQL or PostgreSQL), modeling, optimization, transactions, and locks\nKnowledge of JavaScript and the Node.js ecosystem is desirable (microservices rely on Node.js)\nKnowledge of the cloud environment\nDevOps culture (CI/CD, Docker, Observability)\nMandatory academic background from CPGE scientifiques (Maths Sup / Maths Spé) \nBenefits\nPermanent full-time contract (CDI) \n4-day work week \nProfit-sharing and participation programs \nCompany restaurant \nOn-site gym facilities \nLong-term growth opportunities \nModern engineering culture focused on scalability and 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