{"id":3825239,"url":"https://alion.io/job/sinch-principal-software-engineer-2","title":"Principal 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":28,"ghost_share":0,"stale_share":0.179,"repost_share":0.036,"time_to_fill_p50_days":6,"computed_at":"2026-11-07T05:47:08Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":null,"work_mode":"on_site","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":90000,"max":130000,"currency":"EUR","period":"year","gross":null,"usd_annual":145948},"salary_estimate":null,"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Java","optional":false},{"name":"LLM","optional":false},{"name":"TypeScript","optional":false},{"name":"Vertex AI Agent Builder","optional":false},{"name":"AWS","optional":true},{"name":"GCP","optional":true}],"status":"live","first_seen_at":"2026-11-05T08:08:04Z","employer_posted_date":"2026-11-05","last_verified_at":"2026-11-07T05:59:49Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Principal Engineer / Domain Architect - Agentic Orchestration\nAbout 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.\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\nThe Agentic Orchestration domain builds the conversational AI and agentic layer of the Sinch portfolio: AI agents, reusable intelligenceand MLcapabilities, the Agentic Orchestration Platform, the Chatlayer agent builder, and the Context Store. Its job is to turn services that customers integrate by hand today into one coherent product that orchestrates conversations across channels, applications, and agents.\nWe are looking for a Principal Engineer to be the Domain Architect for this work. You will work across five teams of roughly 35 engineers in Spain, Belgium, Sweden, Germany, and Brazil, alongside the domain's product, design, and engineering leadership. You report to the Engineering Lead for the domain.\nThis is a hands-on role. Expect to spend about half your time writing code, mostly paired with engineers on the teams, in their codebases. The rest goes to architecture, cross-domain work, and building shared understanding of where the system is going and why.\nYou will have a large say in the technical future of conversations at Sinch.\nHow We Work\nPrinciples first. Coherence and quality come from a small set of principles that we hold to. You will help write them, defend them, and change them when they stop serving us.\n\nPairing is the default. We pair and mob/ensemble to design, build, and spread knowledge. Architecture happens at the keyboard with the people who will own it.\n\nExperimental with AI tooling. Agentic coding tools are changing how software is built faster than anyone has settled practices for. We try things, measure what happens, and keep what works.\n\nVisual and shared. Diagrams, models, and maps are how we build shared understanding between engineers, product, design, and stakeholders. If it can't be drawn, it probably isn't understood yet.\n\nResponsibilities\nMake sure the teams building Agentic Orchestration are asking the right questions; share and debate the architecture with them, then pair with them to build it.\n\nOwn the domain's architecture: its boundaries, contracts, data flows, and the decisions behind them. Record decisions and their trade-offs so they can be revisited.\n\nLead cross-domain initiatives. Work with principal engineers and architects across Sinch to solve, or propose solutions to, the hardest technical problems facing a large and complex company.\n\nSet the direction for agentic engineering principles and practices in the domain and lead their adoption, from how we use AI coding tools to how we design, test, and operate agent-based systems.\n\nMake and explain trade-offs under uncertainty: build vs buy, consolidation onto shared Sinch platform capability, deterministic vs agentic designs, speed vs operability.\n\nCreate the diagrams, models, and narratives that let engineers, product managers, designers, and leadership reason about the system together.\n\nGrow technical leadership in the teams: coach tech leads and senior engineers, and raise the quality of design discussion across the domain.\n\nRequirements\n10+ years building software, including significant time as a principal, staff, or architect-level engineer on distributed production systems.\n\nDemonstrated commitment to engineering principles that keep a system coherent and of high quality, and a record of getting teams to adopt them.\n\nExtensive pair or mob programming, and the belief that it is a primary way to design and build software, not an occasional practice.\n\nActive, hands-on use of AI-based development tools (coding agents, LLM-assisted workflows) and an experimental mindset about where they help and where they don't.\n\nDeep understanding of complexity and complex systems: emergent behaviour, feedback loops, coupling, and how sociotechnical structure shapes architecture.\n\nSound judgment on tradeoffs in uncertain environments, and the ability to explain the reasoning to both engineers and non-engineers.\n\nStrong visual thinker: you use diagrams and models to build shared understanding across engineers, stakeholders, and everyone involved in making the software.\n\nPolyglot: deep expertise in at least two languages, ideally including Java or another JVM language. Our systems are built mainly in Java and Go, with some TypeScript, and you can become productive in an unfamiliar language quickly.\n\nStrong understanding of how LLMs and agents work, and how to design reliable systems around them.\n\nAble to influence without authority across teams, domains, and seniority levels.\n\nClear communicator in English.\n\nNice to Have\nExperience with Temporal or similar workflow orchestration platforms .\n\nExperience building conversational AI, LLM-based agents, or agent orchestration systems.\n\nExperience with messaging, voice, or other communications platforms at scale.\n\nFamiliarity with event-driven architectures and cloud-native infrastructure on AWS or GCP.\n\nExperience with platform consolidation or migration across several products.\n\nExperience with domain-driven design, architecture decision records, or C4-style modelling.\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!\n\nThe salary range for this role is €90,000-€130,000 per year, depending on your skills, experience and the impact you bring.","description_format":"text","description_chars":6533,"description_truncated":false,"requirements":{"experience_years_min":10,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Unified Communications","Contact Center Software"],"lifecycle":[{"event":"open","at":"2026-11-05T18:16:19Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":1,"expected_fill_days":6,"reasons":["conf:4","velocity","win:early"],"computed_at":"2026-11-07T05:47:08Z"},"pay":{"stated_usd_annual":145948,"is_top_pay":false},"html_url":"https://alion.io/job/sinch-principal-software-engineer-2","json_url":"https://alion.io/job/sinch-principal-software-engineer-2.json","meta":{"generated_at":"2026-11-07T14:31:35Z","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":18771,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-08T00:00:00Z"}},"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":33778},"rest":"https://alion.io/mcp/rest/get_company?id=33778"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fsinch-principal-software-engineer-2"},{"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%2Fsinch-principal-software-engineer-2"},{"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%2Fsinch-principal-software-engineer-2"},{"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/sinch-principal-software-engineer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsinch-principal-software-engineer-2"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3825239}},{"tool":"search_jobs","arguments":{"company":"sinch.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3825239},"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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