{"id":2678566,"url":"https://alion.io/job/linktree-senior-full-stack-engineer-authentication","title":"Senior Full Stack Engineer, Authentication","company":{"id":723180,"name":"Linktree","domain":"linktree.com","url":"https://alion.io/company/linktree-2","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Gem","truth_index":{"grade":"B","score":77,"open_postings":11,"ghost_share":0,"stale_share":0.909,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-16T05:45:00Z"}},"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":["Melbourne, Australia"],"countries":["AU"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":94000,"max_usd":199000,"period":"year","method":"role_seniority_country_cell","sample_n":9},"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"AWS","optional":false},{"name":"Claude","optional":false},{"name":"Cursor","optional":false},{"name":"GraphQL","optional":false},{"name":"MySQL","optional":false},{"name":"Node JS","optional":false},{"name":"OpenAI Codex","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React.js","optional":false},{"name":"Stripe","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-10-14T05:30:38Z","employer_posted_date":"2026-10-16","last_verified_at":"2026-10-16T06:01:33Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"The Role\nWe’re looking for a Senior Software Engineer to join the Auth team - the group that owns how 70+ million people get into Linktree and stay safely signed in. Authentication is the first thing every Linker touches and the one surface that has to work every single time, across social login, email, sessions, tokens and the business-account access that sits on top of them.\nYou’ll work the whole path: the login and signup flows creators see, the services and APIs behind them, the session and token lifecycle, and the observability that tells us something is wrong before a Linker does. You’ll be hands-on across TypeScript, Node, React and AWS, and you’ll partner closely with Product, Security and the platform teams to decide where to harden, where to simplify, and where a small change in friction moves conversion for tens of millions of people.\nThis is a role for someone who likes owning a critical, unglamorous surface and making it excellent. Every improvement you ship removes a reason someone can’t get to their own digital presence - and helps Linktree achieve our mission: to empower anyone to curate and grow their digital universe.\nWhat You’ll Own\nBuild and ship the authentication and identity experiences Linkers touch first: signup, login, social auth, account recovery and multi-factor.\nOwn the services behind them end-to-end - session and token lifecycle, revocation, rate limiting, and the APIs other squads depend on.\nPartner with Security to harden the auth surface, and with Product to keep friction honest so login conversion improves rather than degrades.\nExtend identity and access for business accounts and Workspaces, including the path toward SSO.\nKeep the surface observable: instrumentation, alerting and dashboards that catch auth failures before Linkers report them.\nBring AI into how you build, and use it to move faster on migrations, tests and investigation.\nRaise the bar around you through review, pairing and documentation, and mentor engineers as the Auth team grows.\nWho We’re Looking For\n4+ years of professional software engineering experience, ideally including time on an auth, identity, platform or payments-adjacent team.\nSolid full-stack skills across our core stack: TypeScript, Node.js, React, GraphQL, PostgreSQL or MySQL and AWS, with the ability to move across layers to ship a feature end-to-end.\nWorking knowledge of authentication and identity fundamentals: OAuth 2.0, OIDC, JWTs, session management, MFA and the common attack classes.\nExperience shipping changes to a high-traffic, critical path safely - feature flags, staged rollouts, migrations and backwards compatibility.\nFluency with AI-assisted development (Claude, Cursor, Codex and similar), including how to prompt, validate and refine what these tools produce.\nA pragmatic instinct for balancing security against user experience, and the confidence to make that trade-off explicit with Product and Security.\nClear communicator who works well with product, design and security partners across Melbourne, Sydney and other time zones.\nAble to work from our Melbourne or Sydney office on a hybrid basis.\nLinktree is committed to providing a fair and competitive compensation package including cash, equity, and benefits. Final offers depend on multiple factors including location, experience, expertise, and role scope, and may vary from the range listed.\nP.S. If you don’t tick every box in this listing, please don’t rule yourself out. We take pride in inclusion and hiring incredible human beings with great potential over ticking boxes - so if this role resonates with you, hit that apply button!\nOur Story\nWe’re on a mission to empower anyone to curate, grow, and monetize their digital universe. We created the “link in bio” category - and we’re just getting started. From creators, artists, and entrepreneurs to global brands, we’re redefining how people connect with their communities, showcase their content and promote products - all in one link.\nToday, a community of 70+ million use Linktree, including icons like Adidas, TikTok, the UN Environmental Program, The NFL, Manchester United, World Central Kitchen, Sabrina Carpenter, Olivia Rodrigo, and Selena Gomez. With 48,000 new accounts created every day, Linktree is the fastest-growing leader in our space.\nWe’ve teamed up with some of the world’s biggest platforms including TikTok, Snap, YouTube, GoFundMe, Spotify, Google, Stripe, Reddit, Laylo, and Kajabi, to unify Linkers’ digital spaces, and we partner with retail brands Amazon, Lululemon, Nike, Target, Sephora, Lululemon, and more to share products they love.\nWe’re a tight-knit, passionate team building best-in-class tools that make online presence simple, powerful, and yours. If you're excited by the idea of shaping a new category, setting the standard, and making space for everyone to be seen and succeed, we’d love to meet you.\nWhere and How We Work\nWe're a global, diverse team spread across continents with offices in London, Los Angeles, Melbourne, and San Francisco. We work together flexibly and you can choose the setup that works best for you: fully remote or a hybrid mix of office and home.\nWe offer autonomy in how you structure your days and weeks. While we’re mindful of time zones and occasionally collaborate outside the typical 9-5, we lean into async work to keep things flowing. Our culture is family-friendly and Zoom-casual where kids, pets, and delivery drivers are welcome.\nHow we’ll help you thrive\nOur approach to benefits considers the whole person and the unique contributions they bring to Linktree. We want the experience at Linktree to be one that enables people to truly thrive so we can Go Further Together (one of our values). Some ways we support you:\nAn annual wellbeing allowance to use on things like (but not limited to) fitness memberships, development courses, childcare, travel, charitable donations, pet insurance, home office set-up - the choice is yours!\n100% coverage (and 80% for your dependents) of your monthly premiums for medical, dental, vision, disability and life insurance for US-based employees.\nEmployer contribution towards your retirement.\nGenerous time off for vacation, holidays, parental leave, volunteer time, and other categories.\nEmployee stock option program - we want each and every employee to share in the company’s success.\nAt Linktree, we believe in promoting a culture that celebrates unique backgrounds, talents, and experiences, and we’re proud to be an equal opportunity workplace. We are creating an inclusive workplace where every individual feels valued, respected, and has equal opportunities to thrive. We aim to foster a diverse and inclusive environment where all team members have a sense of belonging. Linktree welcomes all people regardless of sex, gender identity, race, ethnicity, disability, pregnancy, age, or other lived experience.","description_format":"text","description_chars":6876,"description_truncated":false,"requirements":{"experience_years_min":4,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Home office","Life insurance","Parental leave"],"hiring_locations":[{"name":"Australia","iso":"AU","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Creator & Fan Platforms","Consumer & Utility Software"],"lifecycle":[{"event":"open","at":"2026-10-16T06:01:33Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":2,"expected_fill_days":24,"reasons":["conf:4","win:early"],"computed_at":"2026-10-16T10:35:50Z"},"pay":null,"html_url":"https://alion.io/job/linktree-senior-full-stack-engineer-authentication","json_url":"https://alion.io/job/linktree-senior-full-stack-engineer-authentication.json","meta":{"generated_at":"2026-10-16T10:35:50Z","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":9010,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-17T00:00:00Z"}},"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":723180},"rest":"https://alion.io/mcp/rest/get_company?id=723180"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Flinktree-senior-full-stack-engineer-authentication"},{"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%2Flinktree-senior-full-stack-engineer-authentication"},{"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%2Flinktree-senior-full-stack-engineer-authentication"},{"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/linktree-senior-full-stack-engineer-authentication\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Flinktree-senior-full-stack-engineer-authentication"}]}