{"id":2955061,"url":"https://alion.io/job/trilon-cad-plug-in-developer","title":"CAD Plug In Developer","company":{"id":694570,"name":"Trilon","domain":"trilon.com","url":"https://alion.io/company/trilon","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Pinpoint","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["United States"],"countries":["US"],"hiring_countries":["US"],"hiring_countries_total":1,"salary":{"min":120000,"max":185000,"currency":"USD","period":"year","gross":null,"usd_annual":185000},"salary_estimate":null,"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"AutoCAD","optional":false},{"name":"C#","optional":false},{"name":"C++","optional":false},{"name":"GraphQL","optional":false},{"name":"PostGIS","optional":false},{"name":"PostgreSQL","optional":false},{"name":"QGIS","optional":false},{"name":"Rest API","optional":false}],"status":"live","first_seen_at":"2026-10-19T21:15:46Z","employer_posted_date":"2026-10-21","last_verified_at":"2026-10-22T21:23:21Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"Trilon is building a digital platform that gives engineers one place to manage, share and reuse their design data. The desktop tools our engineers use every day, Autodesk Civil 3D, the Bentley OpenX family (OpenRoads, OpenRail, OpenSite, OpenComms) and Esri ArcGIS Pro, need to connect to that platform directly.\nAs our Senior CAD Plugin Developer, you will own those connections. You will design and build the plugins that let an engineer export a design from their CAD tool into the platform, bring designs back by project, and keep spatial data in sync with ArcGIS. You will set the technical direction for our plugin work and be the team’s expert on CAD and GIS APIs and civil design data.\nThe hard part of this job is less the CAD APIs and more how designers actually work: when they save, what they reuse, where a plan set comes from, and what they will tolerate inside a design session. You will spend real time with civil designers so the plugins fit their workflow instead of interrupting it.\nKey Responsibilities\nBuild the plugins. Design, build and ship production plugins for AutoCAD / Civil 3D (.NET, ObjectARX) and MicroStation / OpenX Designer SDKs (.NET and native SDKs). \nOwn the export path. Build the end-to-end flow from a click in the plugin to the platform: sign-in through the platform (OAuth 2.0 / OpenID Connect from a desktop app, with tokens that persist between sessions), packaging the design, upload through platform APIs, and handling partial failures and retries. \nBuild the import path. Let users browse designs by project, pick files and download them into the CAD session through secure, time-limited download links. \nGet the data right. Extract and convert civil objects (alignments, profiles, corridors, surfaces, pipe networks, feature lines) and their coordinate systems into open formats such as LandXML, IFC and GeoJSON, without losing data. \nConnect to GIS. Build ArcGIS Pro add-ins and integrations that sync CAD spatial data with ArcGIS, including styles, spatial reference files and OGC-standard services. \nFit the designer’s workflow. Sit with civil designers, watch how they work in a session, and shape when and how the plugin asks for their attention. Validate output against real projects before it ships. \nInstrument what you ship. Add usage and error events to the plugins so we can see how export and import perform in the field. \nPackage and support. Own installers, code signing, versioning across yearly Autodesk and Bentley releases, and deployment to engineers’ machines. \nPartner with platform engineers. Work with the platform team on the REST and GraphQL APIs and the storage the plugins call, and on any third-party service integrations the plugins depend on. \nLead technically. Set plugin architecture and coding standards, review code, and mentor other developers on CAD and GIS APIs. \n\nSkills, Knowledge and Expertise\n6+ years of professional software development, with at least 4 years building and shipping CAD plugins or extensions used in production. \nStrong C# and .NET, and working C/C++ for native CAD APIs. \nDeep experience with the AutoCAD and Civil 3D APIs; hands-on experience with the MicroStation SDK or one or more of the Bentley OpenX Designer SDKs (OpenRoads, OpenRail, OpenSite, OpenComms). \nWorking knowledge of civil design workflows and processes: how roadway, drainage, grading or site designers move from survey to model to plan set, what they reuse across projects, and where the time goes. \nExperience calling REST and GraphQL APIs from desktop applications, including OAuth 2.0 / OpenID Connect sign-in and secure token storage. \nExperience with coordinate systems, map projections and spatial data formats (LandXML, GeoJSON, shapefiles, geodatabases). \nArcGIS Pro SDK, ArcGIS REST APIs, Arcade, or QGIS development. \nPostgreSQL / PostGIS or other spatial databases. \n\nAbout Trilon\nTrilon was formed with the vision of building the next Top 20 infrastructure consulting firm in North America by bringing together some of the nation’s best infrastructure consulting firms, focused on delivering practical and sustainable infrastructure solutions. Trilon is backed by Alpine Investors, a PeopleFirst Private Equity Firm. Trilon currently comprises 5,500+ staff across the US. For more information, visit www.trilon.com.\nPay Transparency\nThe base salary range for this role is indicated in the posting. This range reflects the company’s good faith estimate of the compensation for this position at the time of posting. Final compensation will be determined based on factors such as experience, skills, qualifications, internal equity, and geographic location.","description_format":"text","description_chars":4646,"description_truncated":false,"requirements":{"experience_years_min":6,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Engineering Services"],"lifecycle":[{"event":"open","at":"2026-10-20T21:15:46Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":2,"expected_fill_days":20,"reasons":["conf:2","velocity","win:early","comp:brand"],"computed_at":"2026-10-22T06:10:10Z"},"pay":{"stated_usd_annual":185000,"is_top_pay":true},"html_url":"https://alion.io/job/trilon-cad-plug-in-developer","json_url":"https://alion.io/job/trilon-cad-plug-in-developer.json","meta":{"generated_at":"2026-10-22T22:08:23Z","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":7123,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-23T00:00:00Z"}},"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":694570},"rest":"https://alion.io/mcp/rest/get_company?id=694570"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftrilon-cad-plug-in-developer"},{"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%2Ftrilon-cad-plug-in-developer"},{"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%2Ftrilon-cad-plug-in-developer"},{"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/trilon-cad-plug-in-developer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftrilon-cad-plug-in-developer"}]}