Sr Software Engineer, Smart Mobility

Trans Core (TRN), a subsidiary of ST Engineering, is seeking a talented Sr Software Engineer, Smart Mobility to join our team.

Trans Core is building Smart Mobility, a cloud-native mobility platform that lets people move through tolling, parking, and transit from their phone, and connects the agencies, partners, and consumer apps behind it. We are looking for a Senior Software Engineer to build backend services, APIs, and web experiences that make that platform work.

This is a hands-on senior individual contributor role on a small, fast-moving team. You will design and build cloud-native services on Azure in C# and .NET, work across the stack from message-driven backend processing to the customer and operator web portals, and own your features from design through production. The platform is new, so the patterns you set are the ones the team will build on.

This role reports to the Director of Software Engineering, Smart Mobility, and works closely with the Smart Mobility Architecture function, which owns target-state design and standards. You implement within those standards and feed real implementation experience back into them.

You will work daily with mobile, integration, QA automation, and Dev Ops engineers, and with the Product Manager who owns the roadmap. Senior engineers here are expected to mentor, review code, and raise the engineering bar, not just close tickets.

This position will be based in one of these locations – Atlanta, GA, Washington DC, Nashville, TN or Harrisburg, PA. Will consider remote applicants for the right skillset. Position may be hybrid, with a blend of in-office and remote work. Occasional travel may be required based on business needs. Relocation is available for the right candidate.

Include the following. Other duties may be assigned.

• Service development: Design, build, test, and operate scalable backend services and APIs in C# and .NET, including asynchronous and multi-threaded processing of high-volume transaction data.
• Cloud-native patterns: Build services that run as containers on Azure, scale horizontally, degrade gracefully, and handle retries, idempotency, and back pressure correctly.
• Event-driven processing: Implement message-driven and event-driven workflows using queues and streaming technologies such as Azure Service Bus, Event Hubs, Kafka, or RabbitMQ.
• Integrations: Build and maintain integrations to internal tolling and account-management systems, payment providers, and partner APIs against published interface contracts.
• Authentication and API standards: Implement authentication and authorization to standard, using OAuth 2.0 and OpenID Connect for user and service flows, JWT validation, scopes and claims, TLS and mTLS for service-to-service calls, and no hand-rolled auth.
• Data layer: Design schemas, write and tune queries, and own data access and migrations across relational and No
  
  SQL stores.
• Full stack contribution: Contribute to Angular and Type Script front ends for customer and operator web applications as product needs require.

• Testing: Write unit and integration tests as part of the definition of done, and partner with QA Automation on coverage for the features you build.
• Production ownership: Own your services in production, respond to issues in the code you own, and take part in on-call rotation and root cause analysis as the team matures.
• Instrumentation and telemetry: Instrument services with Open Telemetry traces, metrics, and logs against the platform standard, and use Dynatrace and the Grafana stack to answer what a service is actually doing in production.
• Secure by default: Build to security and PCI-DSS expectations, including safe handling of payment and personal data, secrets management, and secure API design.
• Performance: Profile and tune services against throughput and latency targets, and identify scaling limits before they reach production.

• Design participation: Take part in design reviews and technical decisions, document what you build, and make the tradeoffs explicit.
• Code review and mentoring: Review peer code, mentor less experienced engineers, and help set the coding standards and patterns for a new codebase.
• Agile delivery: Work in sprints, give realistic estimates, and surface risk early rather than late.

To perform this job successfully, an individual must be able to perform each essential duty satisfactorily. The requirements listed below represent the knowledge, skill, and/or ability required.

• Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• 10 to 13 years of professional software development experience, with recent hands-on work building production services.
• Strong C# and .NET experience, including .NET Core or later, ASP.NET Core Web API, and asynchronous or…