{"id":780511,"url":"https://alion.io/job/simplemachines-principal-software-engineer","title":"Principal Software Engineer","company":{"id":720743,"name":"Simplemachines","domain":"simplemachines.com","url":"https://alion.io/company/simplemachines-2","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"A","score":95,"open_postings":13,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":148,"computed_at":"2026-11-06T05:58:05Z"}},"role":"Backend","role_family":"Backend","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":99000,"max_usd":200000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":54},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Amazon ECS","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"CloudFormation","optional":false},{"name":"Docker","optional":false},{"name":"GCP","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"Kubernetes","optional":false},{"name":"Machine Learning","optional":false},{"name":"React.js","optional":false},{"name":"Redux","optional":false},{"name":"SQL","optional":false},{"name":"Tailwind CSS","optional":false},{"name":"Terraform","optional":false},{"name":"TypeScript","optional":false},{"name":"Azure Cosmos DB","optional":true},{"name":"Cassandra","optional":true},{"name":"DynamoDB","optional":true},{"name":"Git","optional":true},{"name":"Google Bigtable","optional":true},{"name":"Http4k","optional":true},{"name":"JavaScript","optional":true},{"name":"Ktor","optional":true},{"name":"RxJava","optional":true},{"name":"Scala","optional":true}],"status":"live","first_seen_at":"2026-07-24T00:00:00Z","employer_posted_date":"2026-07-24","last_verified_at":"2026-11-06T07:20:41Z","board_verified":true,"closed_at":null,"days_open":105,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":105},"description":"Principal Software Engineer - Simple Machines\nHybrid · Full-time · London, UK\nAbout Simple Machines\nSimple Machines is a leading independent boutique technology firm with a global footprint across London, Poland, Sydney and New Zealand. We operate at the intersection of data, AI, machine learning, data engineering, and software engineering-building bespoke platforms and products that turn complex data into real-world outcomes.\nWe work with enterprises, technology companies, and governments to help them better understand their organisations, customers, and citizens. Our teams design and build large-scale data platforms, intelligent systems, and high-impact software products.\nWe engineer data to life™.\nRequirements\nThe Role\nAs a Principal Software Engineer, you’ll play a key role in delivering complex, scalable systems for ambitious clients. This is a hands-on engineering role where you’ll work across the full stack-backend services, APIs, frontend components, data pipelines, and cloud infrastructure.\nYou’ll collaborate closely with our internal engineering teams and client stakeholders, influencing technical direction while remaining deeply involved in design and delivery. This role suits someone who enjoys solving hard problems, owning outcomes end-to-end, and operating in a consultative engineering environment.\nWhat You’ll Be Doing\nDesign and build backend services for a highly scalable marketing platform\nOwn the design of APIs, applications, and supporting infrastructure\nDocument technical designs and requirements clearly for both internal teams and clients\nDeliver solutions end-to-end: build, automate, deploy, operate, and support\nPartner with clients and delivery teams to translate business requirements into robust technical solutions\nWork within an Agile, iterative delivery model\nCollaborate in a hybrid setup with both remote and in-person team members and stakeholders\nThe Team\nYou’ll join a high-performing engineering team working on a large-scale machine learning platform for a global telecommunications client.\nThe team operates with a high degree of autonomy and shared ownership. Engineers work across the full stack, support one another’s growth, and collaborate closely with data scientists and adjacent teams to design cross-system solutions.\nStrong engineering culture, real influence, and meaningful problems to solve.\nBenefits\nWhat We’re Looking For\nCore Experience\nStrong foundation in JVM-based development (Kotlin preferred, Java welcome)\nExperience designing and implementing data-driven APIs\nBackground working on large-scale web services\nSolid SQL experience, including schema design and performance-aware queries\nDeep experience with automated testing (unit, integration; TDD/BDD preferred)\nFrontend & Full Stack Exposure\nExperience with React, TypeScript, Redux, and Tailwind (or similar modern frameworks)\nCloud & Infrastructure\nExperience with AWS, GCP, Azure, or similar\nInfrastructure-as-code (Terraform, CloudFormation, etc.)\nContainerised deployments using Docker, ECS, Kubernetes, or equivalent\nNice to Have\nExposure to Scala or functional programming concepts\nExperience with asynchronous and highly concurrent backend frameworks (e.g. Ktor, http4k, Play, RxJava)\nNoSQL experience (DynamoDB, Cassandra, BigTable, Cosmos DB, etc.)\nStrong Git workflow experience and the ability to adapt workflows to project needs\nA genuine appetite for learning and adopting new technologies quickly","description_format":"text","description_chars":3449,"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":[],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Analytics & BI Consulting","Data Engineering & Migration Services"],"lifecycle":[{"event":"open","at":"2026-09-12T00:41:34Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Senior or Specialist Worker, Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Global Business Mobility: Senior or Specialist Worker; 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