{"id":3158363,"url":"https://alion.io/job/motorway-principal-engineer","title":"Principal Engineer","company":{"id":4269,"name":"Motorway","domain":"motorway.co.uk","url":"https://alion.io/company/motorway","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"lead","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":77000,"max_usd":126000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":102},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"AI Agents","optional":false},{"name":"AWS","optional":false},{"name":"IAM","optional":false},{"name":"Incident Management","optional":false},{"name":"LLM","optional":false},{"name":"SLI/SLO/SLA","optional":false}],"status":"live","first_seen_at":"2026-10-23T15:00:46Z","employer_posted_date":"2026-10-23","last_verified_at":"2026-10-25T21:48:24Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"About Motorway\nMotorway is the UK's largest online car-selling platform. We connect private sellers directly with over 8,000 dealers nationwide. Our online platform helps sellers achieve great prices for their cars while giving dealers fast, reliable access to the stock they want for their dealerships. Founded in 2017, our award-winning, technology-led approach has redefined the experience of selling a car. Motorway is backed by some of the world’s leading technology investors, having raised £143 million in Series C funding.\nThis is a unique opportunity to join a fast-growing scale-up at a crucial phase of growth and help change an industry for the better.\nAbout the team\nHi, I'm Mariot, I lead Engineering here at Motorway. We're around 70 engineers across product teams, building the marketplace and all services around that handles hundreds of vehicle transactions every day. We care about delivering value to the business, getting the architecture engineering sound, keeping the production bar high, and being early and deliberate about the technology we adopt. \nWe have been early adopters of GenAI for software engineering, we've built a reputation for that, and we'd like to keep earning it. AI is enabling us to deliver faster at a much higher quality software while easing the maintenance of our existing services.\nAbout the role\nWe're looking for a Principal Engineer to set technical direction and evolve engineering practices across Motorway, reporting to the Director of Engineering. This is a broad role: your remit spans multiple product areas and every engineering specialties, and your decisions will shape what we build, what we buy, and what we retire.\nYou'll work with engineering leadership, product, and other functions stakeholders to continuously evolve our overall architecture and practices, and with our senior and staff engineers to turn that direction into working software.\nYou will own our relationships with AWS on the engineering side, our main cloud provider. It's the foundation of our platform and one of our most important partnerships. In practice, we expect you to lead the following activities:\nFrequently meet AWS representatives getting access to latest services and features, share feedback on our usage and needs, and be an early tester and adopter of new services/\n\nIdentify new services we could adopt to continuously improve our reliability and ability to build new services and features at pace for the business.\n\nShare internally good practices on software engineering at the edge and usage of AWS services, including continuously updating technical recommendations for humans and agents.\n\nYou'll represent Motorway on stage at external events and in the wider engineering community, and you'll set the standard for how engineers here present their work internally.\nYou'll also lead on our adoption of AI for software engineering. We give engineers access to the latest models through Kiro, and we want someone who can define what good looks like when domain depth, AI-enabled breadth, and rigorous evaluation all have to work together.\nIn this role, you will:\nSet technical strategy across multiple product areas, and make the commercial case for it to leadership with data rather than assertion\n\nIdentify cross-cutting architectural risks and resolve them before they block us at scale\n\nSet engineering standards, architectural patterns, and documentation norms, including the writing precision that makes specs reliable inputs for both engineers and agent systems\n\nRaise the reliability, observability, and security bar across engineering: SLO philosophy, incident management standards, production readiness, and threat models that hold up in the AI era\n\nBe a force of innovation on AI for Software Engineering.: Monitor our LLM usage, latest models trial and evaluation, technical debt modernisation through AI agents.\n\nDevelop staff engineers and technical leads, multiplying leadership capacity across the organisation\n\nOwn the AWS relationship on the engineering side: architecture reviews with their solution architects, early access programmes, and the calls on which services we adopt, when, and at what cost\n\nSpeak for Motorway in public, at AWS summits, conferences and meetups, and raise the bar internally for how engineers present their work to each other and to the business\n\nAbout you\nTen years or more in software engineering, with several of those spent operating at Staff or Principal level\n\nA track record of setting technical direction across several teams or product areas, where your decisions changed company outcomes\n\nExceptional AWS expertise, both wide and deep. You've designed, operated and paid the bill for serverless, containers, networking, identity and data services at production scale, and you can hold your own in a room of AWS solution architects\n\nThe judgement to evaluate new platforms and services against structured technical and commercial criteria, and to say no to the ones that don't earn their place\n\nStrong grounding in API and identity architecture: OAuth 2.0, OIDC, PKCE, JWT, and IAM patterns across multiple accounts\n\nExperience setting observability and reliability standards, and running incident practice that teams take seriously\n\nComfort across the stack: you can read or write code in most languages, and follow a request from the browser through to the data layer\n\nA record of developing senior engineers into technical leaders, and of raising the hiring bar in your discipline\n\nPractical experience building with LLMs and agents in production, including how you evaluate them and keep their output trustworthy\n\nA strong public speaker with a track record to show us. You've presented at conferences, summits or large internal forums, and you can make a technical argument land with a room of engineers or a room of executives\n\nWriting that holds up under scrutiny: specs, architecture decision records, and strategy documents that others can act on without a meeting\n\nYou could be a great fit if\nYou create clarity in situations where no obvious technical path exists\n\nYou challenge the status quo with evidence and worked alternatives, and you have the patience to bring people with you\n\nYou argue for the simplest architecture that meets the requirement, because you've lived with the long-term cost of the alternative\n\nYou carry a pattern library of production failures and over-engineered systems, and you use it to stop others repeating expensive mistakes\n\nYou want the stage rather than tolerate it, and you're as comfortable in a keynote slot as you are in a Monday morning team demo\n\nYou enjoy making the engineers around you better, whether that's mentoring, review, or helping someone prepare their first public talk\n\nYou stay curious about new tools and honest about which ones are worth adopting\n\nWe offer a fantastic range of benefits to help you thrive:\nGreat work-life balance\n\nLondon office location with regular social events, office drinks and free snacks to keep you going\n\nHybrid work schedule with 2 days per week in our Central London office\n\nStock options so you can share in Motorway's growth and future success\n\nPension scheme to plan for your future with our provider NEST\n\nStrong commitment to your personal development including budget for books, courses, conferences, etc\n\nOpt-in comprehensive health insurance through BUPA including dental care and fitness discounts\n\nCycle to work scheme, save big ££ on a new bike and accessories\n\nOne paid volunteering day a year for you to use as you wish\n\nGenerous parental benefits including 6 months full paid maternity leave, 4 weeks paternity leave and workplace nursery scheme... and much more!","description_format":"text","description_chars":7685,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Health insurance","Hybrid work","Stock options","Workplace nursery"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Marketplaces"],"lifecycle":[{"event":"open","at":"2026-10-23T15:13:59Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker","cap_exempt":false,"checked_at":"2026-10-24T06:24:00+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":1,"expected_fill_days":32,"reasons":["conf:3","win:early"],"computed_at":"2026-10-25T05:49:26Z"},"pay":null,"html_url":"https://alion.io/job/motorway-principal-engineer","json_url":"https://alion.io/job/motorway-principal-engineer.json","meta":{"generated_at":"2026-10-26T00:49:33Z","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":940,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-27T00:00:00Z"}},"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":4269},"rest":"https://alion.io/mcp/rest/get_company?id=4269"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmotorway-principal-engineer"},{"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%2Fmotorway-principal-engineer"},{"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%2Fmotorway-principal-engineer"},{"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/motorway-principal-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmotorway-principal-engineer"}]}