Software Engineer III

Overview

At HNTB, you can create a career that is meaningful to you while building communities that matter to all of us. For more than a century, we have been delivering solutions for some of the largest, most complex infrastructure projects across the country. With our historic growth, it is an exciting time to join our team of employee‑owners.

This opportunity entails being responsible for contributing to the design and development of innovative software solutions for complex business needs. You will work with clients and stakeholders to help define software solution strategy and contribute to architectural decisions using advanced technologies. In this role, you will be responsible for managing assigned tasks, contributing to the definition of scope and technical approach, and ensuring quality and performance in solution delivery.

You will also provide technical guidance to junior team members and support the evolution of development practices, positioning yourself for future leadership in enterprise software solution initiatives. This role bridges individual contribution and technical leadership, preparing you for senior‑level responsibilities by expanding your influence across projects and teams.

• Leads the development of complex software components and features.
• Works with clients and stakeholders to help define software solution strategy and architecture.
• Manages assigned tasks and contributes to defining scope, technical approach, and delivery plans.
• Ensures code quality, performance, and security through reviews, testing, and optimization.
• Provides technical guidance and mentorship to junior engineers.
• Collaborates with cross‑functional teams to integrate software into enterprise systems.
• Supports the evolution of development practices and contributes to architectural decisions.
• Participates in Agile planning, estimation, and retrospectives.
• Performs other duties as assigned.

• Bachelor’s degree in computer science or related field and 5 years of relevant experience, or
• Master’s degree in computer science or related field and 4 years of relevant experience, or
• In lieu of education, 9 years of relevant experience.

• Strong knowledge of software architecture and design patterns.
• Experience with CI/CD, cloud platforms, and container orchestration.
• Advanced proficiency in modern programming languages and frameworks.
• Ability to lead technical discussions and mentor others.

• Experience designing solutions using various cloud platforms including AWS and MS Azure.
• Building Application Programming Interfaces (APIs) that allow the backend to communicate seamlessly with the front end (what the user sees) and third‑party services.
• Performance & Scalability:
  Optimizing the server and database architecture to ensure the app runs fast, even during sudden spikes in traffic.
• Languages & Frameworks:
  Python, C#, JavaScript/Node.js.
• Databases:
  
  Experience with one or more databases such as PostgreSQL, MSSQL, MongoDB, Redis, Oracle, No
  
  SQL.
• Experience developing and maintaining public‑facing SaaS applications supporting stakeholder engagement and data collection.
• Experience in integrating third‑party services and APIs (e.g., communication tools, data systems, GIS, outreach platforms).
• Experience implementing secure application design practices, including PII data protection (masking, validation, controlled access), role‑based access control and identity management, familiarity with public‑sector compliance frameworks (NIST, SOC, ISO).
• Understanding of SSO integrations (SAML, identity providers like Entra ).
• Strong experience building and supporting cloud‑native applications on AWS (multi‑region architectures where applicable), proficiency in AWS services such as Compute (EC2, Lambda, container services ECS), Storage (S3, EBS), Databases (RDS, DynamoDB), Networking (VPC, subnets, security groups), deep understanding of the AWS Shared Responsibility Model and secure cloud design.
• Strong understanding of the web development lifecycle and programming techniques and tools.
• Excellent project and time management skills.
• Collaborating with the front‑end developers and other team…