{"id":471736,"url":"https://alion.io/job/sinch-sr-software-engineer","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":43,"ghost_share":0,"stale_share":0.116,"repost_share":0,"time_to_fill_p50_days":4,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Spain"],"countries":["ES"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":60000,"max":80000,"currency":"EUR","period":"year","gross":null,"usd_annual":88969},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Amazon EKS","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Claude Code","optional":false},{"name":"Copilot","optional":false},{"name":"Cursor","optional":false},{"name":"Docker","optional":false},{"name":"DynamoDB","optional":false},{"name":"Go","optional":false},{"name":"Java","optional":false},{"name":"Kubernetes","optional":false},{"name":"WhatsApp","optional":false}],"status":"live","first_seen_at":"2026-07-16T00:00:00Z","employer_posted_date":"2026-07-16","last_verified_at":"2026-10-17T19:52:51Z","board_verified":true,"closed_at":null,"days_open":93,"trust":{"level":"stale","repost_count":1,"flags":["stale"],"days_open":93},"description":"ABOUT SINCH\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. Whether 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. At Sinch we \"Dream Big\", \"Win Together\", \"Keep it simple\", and \"Make it Happen\". These values are our foundation!\nDESCRIPTION\nWe are building the next generation of conversational AI infrastructure. As a Senior Software Engineer on the Context Storage team, you will design, build, and own the core data platform that captures, persists, and serves conversational context to AI agents operating across SMS, WhatsApp, and voice at scale.\nThis is a zero to one opportunity to build a new platform from the ground up, working closely with all the teams belonging to the AI Agents domain. You will work on complex problems with high autonomy as part of a small senior team with significant impact. You will collaborate with Engineering Managers, Tech Leads, Product Managers, Domain Architects and cross-functional teams.\nTech stack: Go, Kafka, DynamoDB, AWS, Kubernetes\nYou will:\nDesign and build the event-driven pipelines that capture conversational and interaction events across channels and persist them into durable, queryable stores\nOwn the data model and storage architecture that represents conversational context in DynamoDB, designed for fast, consistent, and cost-efficient access by AI agents\nDesign system architecture and create technical proposals covering event ingestion, schema/table design, single-table vs. multi-table strategies, and read/write access patterns on DynamoDB\nBuild event sourcing / CQRS-style systems that reconcile high-throughput event streams via Kafka with strongly consistent context reads\nWrite production-grade Go services, including clean, maintainable code with tests and documentation; build systems that are observable, debuggable, and resilient\nOwn the full lifecycle of the systems you build: design, deployment, monitoring, and on-call responsibilities\nFollow a build-ship-run approach\nDesign APIs and data contracts that let AI agent platform teams retrieve relevant context efficiently, addressing challenges like data freshness, TTL/retention, partition key design, hot partitions, and query latency at scale\nOptimise DynamoDB capacity modes, indexing (GSIs/LSIs), and access patterns for cost, throughput, and latency as event volume and agent concurrency grow\nContribute to engineering excellence through architecture discussions, code reviews, and standards definition\nMentor team members and share knowledge\nCollaborate across teams with product and technical stakeholders, providing technical guidance on trade-offs between consistency, availability, and performance\n\nREQUIREMENTS\nYou should have:\n5-8+ years of professional software engineering experience.\n\nStrong backend and platform skills including distributed systems, microservices, event-driven architectures, event-sourcing systems and cloud-native design on AWS\n\nExperience with Kafka or other event-streaming platforms\n\nSolid backend engineering experience in Golang (preferred)/Java/Node; willingness to learn other languages/technologies as needed\n\nSolid experience with data modelling and persistence at scale, ideally with DynamoDB or equivalent NoSQL experience\n\nExperience integrating with LLMs and vector databases in a backend or platform context\n\nExperience with AWS and operations including core AWS services (DynamoDB, EKS, etc.), Docker, Kubernetes, CI/CD, infrastructure as code, and monitoring\n\nAbility to explain architectural trade-offs clearly, especially around storage, consistency, and throughput\n\nStrong engineering fundamentals including clean code, testing strategies, debugging production systems, and building reliable, long-lasting systems\n\nExperience using AI coding tools such as Copilot, Claude Code, Cursor, or similar, with an understanding of their benefits, risks, and best practices\n\nAbility to work autonomously, define scope, and deliver solutions independently; strong decision-making on prioritisation\n\nStrong communication skills with both technical and non-technical stakeholders\n\nFluency in English\n\nIt's a plus if you also have:\nExperience building platforms from scratch\nBackground in CPaaS or communication platform\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!\nSalary\nThe annual salary for this position in Spain is between €60,000 - €80,000. 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