{"id":1744928,"url":"https://alion.io/job/sinch-sr-software-engineer-6","title":"Sr Software Engineer","company":{"id":33778,"name":"Sinch","domain":"sinch.com","url":"https://alion.io/company/sinch","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Oracle","truth_index":{"grade":"A","score":100,"open_postings":38,"ghost_share":0,"stale_share":0.132,"repost_share":0.026,"time_to_fill_p50_days":5,"computed_at":"2026-10-26T05:57:25Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Madrid, Spain","Sweden"],"countries":["ES","SE"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":70000,"max":90000,"currency":"EUR","period":"year","gross":null,"usd_annual":101082},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"etcd","optional":false},{"name":"Function Calling","optional":false},{"name":"GCP","optional":false},{"name":"LLM","optional":false},{"name":"LLM Guardrails","optional":false},{"name":"Node JS","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"Redis","optional":false},{"name":"State Management","optional":false},{"name":"TypeScript","optional":false},{"name":"WebSockets","optional":false},{"name":"Docker","optional":true},{"name":"JavaScript","optional":true},{"name":"Kubernetes","optional":true},{"name":"NLP","optional":true}],"status":"live","first_seen_at":"2026-10-02T14:53:54Z","employer_posted_date":"2026-10-20","last_verified_at":"2026-10-26T13:59:26Z","board_verified":true,"closed_at":null,"days_open":24,"trust":{"level":"ok","repost_count":1,"flags":[],"days_open":23},"description":"Description\nSinch is pioneering the way the world communicates. More than 150,000 businesses - including Google, Uber, PayPal, Visa, Tinder, and many others - rely on Sinch’s Customer Communications Cloud to power engaging customer experiences through mobile messaging, voice, and email.\nWhether you need to verify users or craft omnichannel campaigns, Sinch makes it easy. Our AI-infused Super Network, APIs, and applications ensure you can connect with your customers reliably and securely, at every step of their journey.\nAt Sinch we “Dream Big”, “Win Together”, “Keep it simple”, and “Make it Happen”. These values are our foundation!\nThe Role\nOur Intelligence team owns the AI at the core of Sinch’s conversational products: the systems that decide what a conversation means and where it goes next, and the assistants our customers use to configure those products. We build and operate the intelligence layer behind Agentic Orchestration - conversation routing through intent classification, retrieval-augmented generation and runtime conversation understanding, plus product assistants and copilots. We own these from first prototype through production, and they carry real conversations at real volume.\nAs a Senior Software Engineer, you will sit with our AI engineers and own the backend where the product meets the platform: durable orchestration, service boundaries, state, and how the system behaves once it is live. You will join a team of six - three senior AI engineers and an MLOps/DevOps engineer, led by our Tech Lead & Engineering Manager and our Product Manager. As you grow into the domain, you will also take on AI engineering work alongside the team. We use AI on purpose across discovery, development, review and incidents, and you will help shape that way of working. This is a hybrid role with expectations to work from our Madrid office every quarter.\nWhat You Will Do\nShape how our conversation-routing and product-assistant services plug into the rest of Sinch: Agentic Orchestration, neighbouring product APIs, and identity.\nBuild the backend behind those services: APIs, persistence, and orchestration of multi-step AI workloads - durable workflows, retries, and state that survive a process restart.\nLead code reviews, technical discussions, and knowledge-sharing sessions.\nMentor and be mentored by other engineers, and help keep a culture rooted in the team’s values.\nCarry production through on-call rotations and incident response.\nInvest in system health: test coverage, technical debt, and how we operate.\nHelp evolve how the team builds with AI: the tools, guardrails, and shared practices.\n\nWhat We Are Looking For\n5+ years of professional software engineering experience.\nStrong proficiency in Python and Node.js/TypeScript.\nExperience with real-time systems: streaming APIs (SSE or WebSocket) and event-driven architectures.\nHands-on experience with distributed systems and microservices, including state management across replicas (e.g. etcd, Redis).\nExperience building RESTful APIs and event-driven systems, ideally with Kafka.\nHands-on experience with durable workflow orchestration, ideally Temporal (long-running workflows, activities, retries, concurrency across workers).\nSolid experience with complex cloud infrastructure, ideally GCP and/or AWS.\nWorking knowledge of MongoDB or similar document databases.\nStrong system design fundamentals: scalability, latency, failover, and trade-offs.\nProduction experience with AI, LLMs, or agents, and a working grasp of AI engineering concepts (RAG, tool use, agent patterns, evaluation, guardrails, LLM observability), with the willingness to go deeper.\nActive use of AI in your own engineering work, with full accountability for what you ship.\nClear communication in English, written and spoken, and comfort working in a distributed, cross-functional team.\n\nNice to have\nExperience with conversational AI, chatbot or voicebot platforms, or NLP/NLU pipelines.\nExperience with Docker and Kubernetes.\nFamiliarity with identity management (OAuth/OIDC).\nExperience in a CPaaS, scale-up, or fast-growth product company.\n\nOUR HIRING PROCESS\nWe are committed to ensuring a recruitment process that is fair, objective, consistent, and inclusive. Our approach includes structured, competency-based interviews designed to evaluate your skills, experience, and qualifications relevant to the role. At times, we may include a data-driven assessment to enhance our hiring success and identify candidates likely to excel.\nWe believe in a two-way process and encourage you to ask questions throughout the journey. If this role isn’t what you’re looking for, please explore the other opportunities listed on our career page: https://www.sinch.com/careers/. No matter who you are, we hope you find an exciting path forward - hopefully with us!\nThe pay range for this role per year is 70,000 - 90,000 Euros depending on skills and experience.\ned on our career page:https://www.sinch.com/careers/. 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