{"id":144600,"url":"https://alion.io/job/aircall-senior-backend-software-engineer-python","title":"Senior Backend Software Engineer - Python","company":{"id":52973,"name":"Aircall","domain":"aircall.io","url":"https://alion.io/company/aircall","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":100,"open_postings":4,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":45,"computed_at":"2026-10-16T05:45:00Z"}},"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":["Madrid, Spain"],"countries":["ES"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":57000,"max_usd":122000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":25},"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"AWS","optional":false},{"name":"Clean Architecture","optional":false},{"name":"GCP","optional":false},{"name":"LLM","optional":false},{"name":"Python","optional":false},{"name":"Voice Agents","optional":false},{"name":"WhatsApp","optional":false},{"name":"Celery","optional":true},{"name":"FastAPI","optional":true},{"name":"JavaScript","optional":true},{"name":"Kubernetes","optional":true},{"name":"Next.js","optional":true},{"name":"PostgreSQL","optional":true},{"name":"React.js","optional":true},{"name":"Tailwind CSS","optional":true}],"status":"live","first_seen_at":"2026-07-17T08:45:47Z","employer_posted_date":"2026-09-14","last_verified_at":"2026-10-16T13:40:28Z","board_verified":true,"closed_at":null,"days_open":91,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":91},"description":"Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We’re redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace.\nOur momentum comes from a simple idea: help teams work smarter, not harder. Aircall’s AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence.\nAircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We’ve built a product customers love and a business that’s scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines.\nAt Aircall, you’ll join a company in motion. We’re ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth.\nHow we work at Aircall: We’re customer-obsessed, data-driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you’ll feel at home here.\nThe Role\nWe’re looking for a strong Senior Python Engineer who’s eager to go beyond traditional backend development.\nThis role is for someone ambitious-someone who takes pride in building things well, but knows how to move fast in a startup environment. You strike the right balance between clean architecture and pragmatism, between perfection and progress.\nYou’re energized by hard technical problems-distributed systems, AI orchestration, architectural trade-offs, performance, and scalability. You can go deep when needed, but you’re equally focused on shipping, learning, and iterating quickly.\nYou’re curious by nature, committed to continuous improvement, and excited to bring the most effective modern approaches-whether agentic patterns or AI-augmented development workflows-into real-world production.\nThis isn’t just another engineering role. It’s an opportunity to help build the intelligence layer behind a next-generation autonomous Sales OS.\nKey Responsibilities:\nDesign and implement production-grade Python services with clean architecture and strong engineering discipline. \nArchitect scalable, distributed systems using Domain-Driven Design (DDD) principles. \nIntegrate with external SaaS systems (CRMs, dialers, meeting tools, OAuth providers). Optimize performance, latency, cost, and reliability of AI-driven systems. \n\nBuild and orchestrate LLM-powered agents (planning, reasoning, tool usage, memory). \nDevelop internal frameworks to manage: Agent coordination \nTool execution \nMemory layers \nEvent-driven workflows \n\nWork closely with AI engineers, product, and founders to transform complex sales workflows into autonomous processes. \nUse AI coding assistants effectively and experiment with AI-augmented development workflows. \nQualifications:\n7+ years of strong backend engineering experience. \nAdvanced Python expertise (async, typing, architecture patterns, testing)\nExperience designing scalable distributed systems. \nYou design thoughtful, well-architected systems and write clean, high-quality code, with a focus on performance and long-term maintainability.\nExperience with GCP (preferred) or AWS. \nMindset: You’re energized by building systems that can reason and take action-not just generate responses.\nYou actively leverage AI coding assistants and are driven to push the boundaries of AI-augmented engineering.\nYou thrive in fast-paced startup environments where ownership is real and impact is immediate.\nStrong communication skills are essential-you’ll collaborate closely with Product, Design, and Business stakeholders, and stay deeply connected to our users and the problems they’re trying to solve.\nFluency in English is required; Spanish is a plus.\nTech Stack\nBackend: Python, FastAPI, Celery, PostgreSQL, uv (package-manager) \nFrontend: NextJS, Tailwind \nDevOps: Google Cloud, Kubernetes \nWhy join us?\nKey moment to join Aircall in terms of growth and opportunities\nOur people matter, work-life balance is important at Aircall\nFast-learning environment, entrepreneurial and strong team spirit\n45+ Nationalities: cosmopolite & multi-cultural mindset\nCompetitive salary package & benefits\nDE&I Statement: \nAt Aircall, we believe diversity, equity and inclusion - irrespective of origins, identity, background and orientations - are core to our journey. \nWe pride ourselves on promoting active inclusion within our business to foster a strong sense of belonging for all. We’re working to create a place filled with diverse people who can enrich and learn from one another. We’re committed to ensuring that everyone not only has a seat at the table but is valued and respected at it by providing equal opportunities to develop and thrive. \nWe will constantly challenge ourselves to make sure that we live up to our ambitions around diversity, equity and inclusion, and keep this conversation open. Above all else, we understand and acknowledge that we have work to do and much to learn.\nWant to know more about candidate privacy? Find our Candidate Privacy Notice here.\nWe may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. 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