{"id":2119787,"url":"https://alion.io/job/preply-senior-ii-back-end-engineer-3","title":"Senior II Back-End Engineer","company":{"id":181313,"name":"Preply","domain":"preply.com","url":"https://alion.io/company/preply","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":80,"open_postings":51,"ghost_share":0,"stale_share":0.98,"repost_share":0,"time_to_fill_p50_days":16,"computed_at":"2026-10-21T05:46:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Barcelona, Spain"],"countries":["ES"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":52000,"max_usd":111000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":30},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"A/B Testing","optional":false},{"name":"AI Agents","optional":false},{"name":"Django","optional":false},{"name":"Edge AI","optional":false},{"name":"Go","optional":false},{"name":"Java","optional":false},{"name":"Node JS","optional":false},{"name":"PHP","optional":false},{"name":"Python","optional":false},{"name":"Ruby","optional":false},{"name":"Scala","optional":false},{"name":"C#","optional":true},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2025-09-05T14:08:46Z","employer_posted_date":"2025-09-05","last_verified_at":"2026-10-21T04:40:39Z","board_verified":true,"closed_at":null,"days_open":410,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":410},"description":"We power people’s progress.\nAt Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact.\nWe’ve just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we’re only getting started. As a category-defining company, we’re shaping what the future of learning looks like at global scale.\nEvery Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day.\nMeet the team!\nJoin Preply’s Teams and help us power people’s progress through life-changing learning experiences. We’re on a mission to combine the magic of the best tutors with cutting-edge AI to create personalized journeys that keep learners motivated and inspired.\nThe Preply Engineering Team provides the tools to help unlock human potential through learning. We implement A/B tests to prove the value of our initiatives and improve our product based on data and students' and tutors' feedback. As part of our commitment to ensuring high-quality products, we prioritize monitoring and metrics analysis to identify areas for optimization and ensure our services are performing at their best.\nAs a Senior II Backend Engineer, you'll drive technical direction across multiple squads, lead high-impact initiatives, and build the systems that power Preply's global growth engine. Your work will influence how we scale our platform, align teams around shared outcomes, and help millions of learners connect with tutors worldwide.\nPython is our primary language, but prior experience with it isn't mandatory. We take a tech-agnostic approach and welcome engineers from various backgrounds, such as Java, Node.js, Ruby, Scala, .NET, PHP, or Go. What we truly look for is an eagerness to learn the language and the adaptability to hit the ground running with product development.\nWhat you’ll be doing\nOwn, shape, and drive technical direction across multiple engineering squads.\n\nLead complex, ambiguous initiatives from idea to delivery, aligning engineers, teams, product managers, and stakeholders around shared outcomes.\n\nDesign, build, and evolve scalable backend systems using Python/Django, data pipelines, and third-party integrations that support long-term business growth.\n\nPartner with PMs, EMs, and senior stakeholders to shape roadmaps, make technical trade-offs, and guide investment decisions.\n\nRaise the engineering bar through mentoring, architectural reviews, and engineering best practices.\n\nDrive reliability, observability, performance, and operational excellence across multiple services and teams.\n\nFoster a quality-first culture through automation, documentation, and continuous improvement.\n\nParticipate in on-call rotation (1 week every 5 weeks).\n\n What you need to succeed\nExposure to architectural patterns of a large, high-scale web application (e.g., well-designed APIs, high-volume data pipelines, efficient algorithms);\n\nProven experience leading complex, greenfield projects end-to-end\n\nA track record of shaping architectural decisions and setting engineering standards that impact multiple teams or domains.\n\nComfort with shaping product scope, challenging requirements, and focusing on customer value.\n\nStrong communication (English level B2+) with the ability to influence senior peers and leadership through clear reasoning and strong technical judgment.\n\nAI Expertise: You're a forefront user of Agentic AI. You're able to bring hands on experience and start influencing the team beyond code generation; reserving judgment for architecture, business logic, and security, using AI as a thought partner and able to set up quality gates and safety nets to enhance existing engineering workflows and propose AI-native alternatives.\n\nWillingness to join your team's on-call rotation (1 week out of every 5).\n\nWhy you’ll love it at Preply\nAn open, collaborative, dynamic, and diverse culture.\n\nA generous monthly allowance for lessons onPreply.com, Learning & Development budget, and time off for your self-development;\n\nA competitive financial package with equity, leave allowance, and health insurance;\n\nNot in Barcelona? We offer an attractive relocation package to join us in our Preply Barcelona Hub;\n\nAccess to free mental health support platforms;\n\nAccess to Gympass-partnered wellness and gym centers throughout Spain to promote and support well-being and physical health;\n\nThe opportunity to shape the lives of learners and tutors through language learning and teaching in 175 countries (and counting!).\n\nOur Principles\nCare to change the world - We are passionate about our work and care deeply about its impact to be life changing.\n\nWe do it for learners - For both Preply and tutors, learners are why we do what we do. Every day we focus on empowering tutors to deliver an exceptional learning experience.\n\nKeep perfecting - To create an outstanding customer experience, we focus on simplicity, smoothness, and enjoyment, continually perfecting it as every detail matters.\n\nNow is the time - In a fast-paced world, it matters how quickly we act. Now is the time to make great things happen.\n\nDisciplined execution - What makes us disciplined is the excellence in our execution. We set clear goals, focus on what matters, and utilize our resources efficiently.\n\nDive deep - We leverage business acumen and curiosity to investigate disparities between numbers and stories, unlocking meaningful insights to guide our decisions.\n\nGrowth mindset - We proactively seek growth opportunities and believe today's best performance becomes tomorrow's starting point. We humbly embrace feedback and learn from setbacks.\n\nRaise the bar - We raise our performance standards continuously, alongside each new hire and promotion. We build diverse and high-performing teams that can make a real difference.\n\nChallenge, disagree and commit - We value open and candid communication, even when we don’t fully agree. We speak our minds, challenge when necessary, and fully commit to decisions once made.\n\nOne Preply - We prioritize collaboration, inclusion, and the success of our team over personal ambitions. Together, we support and celebrate each other's progress.\n\nDiversity, Equity, and Inclusion\nPreply.com is committed to creating an inclusive environment where people of diverse backgrounds can thrive. We believe that the presence of different opinions and viewpoints is a key ingredient for our success as a multicultural Ed-Tech company. That means that Preply will consider all applications for employment without regard to race, color, religion, gender identity or expression, sexual orientation, national origin, disability, age or veteran status.","description_format":"text","description_chars":7078,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"phd","optional":false},"security_clearance":false,"languages":[{"language":"English","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":["Equity","Growth opportunities","Health insurance"],"hiring_locations":[{"name":"Spain","iso":"ES","kind":"country"}],"hiring_excludes":[],"relocation_offered":true,"industries":["EdTech Platforms","Language Learning"],"lifecycle":[{"event":"open","at":"2026-10-08T23:52:29Z"}],"visa":[],"liveness":{"score":5,"band":"cold","label":"Long shot","p_open":1,"p_active":0.164,"p_room":0.28,"age_days":410,"expected_fill_days":16,"reasons":["conf:1","stale_co","velocity","win:tail","crowd:brand"],"computed_at":"2026-10-21T05:46:15Z"},"pay":null,"html_url":"https://alion.io/job/preply-senior-ii-back-end-engineer-3","json_url":"https://alion.io/job/preply-senior-ii-back-end-engineer-3.json","meta":{"generated_at":"2026-10-21T07:30:36Z","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":10679,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-22T00:00:00Z"}},"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":181313},"rest":"https://alion.io/mcp/rest/get_company?id=181313"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fpreply-senior-ii-back-end-engineer-3"},{"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%2Fpreply-senior-ii-back-end-engineer-3"},{"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%2Fpreply-senior-ii-back-end-engineer-3"},{"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/preply-senior-ii-back-end-engineer-3\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fpreply-senior-ii-back-end-engineer-3"}]}