Top Senior Software Engineer Jobs in Portland, ME

Lead the development of high-performance software systems, mentor junior engineers, and contribute to technology strategy while ensuring scalable and maintainable solutions.

Design and own AI-agent-driven test workflows and the automated verification framework. Build test context, select models and tooling, validate AI-generated code and tests, operate test automation across UI/API/mobile/data, ensure security and compliance, mentor teams, and continuously improve agent orchestration and observability.

Design, build, and maintain backend services in TypeScript for millions of users; develop full‑stack features with React/React Native; participate in code reviews; provide technical leadership, mentorship, and architecture guidance; collaborate with PM and design; use monitoring/metrics and Agile practices to deliver scalable, user-focused products.

Provide technical leadership for sustaining and modernizing a portfolio of .NET web applications and reports. Develop and modernize code (C#, ASP.NET Core, .NET 4.8), migrate SSRS to Power BI and WebForms to ASP.NET Core, design Azure cloud infrastructure (Databricks, Synapse, Functions, App Services), maintain SQL Server/T-SQL databases, ensure security/ATO compliance and accessibility, and mentor junior developers on task-based government assignments.

Provide technical leadership to design, modernize, and sustain a portfolio of .NET web applications and Azure infrastructure. Develop and migrate WebForms to ASP.NET Core and SSRS to Power BI, maintain SQL Server databases, enforce secure coding and ATO compliance, ensure accessibility (Section 508/WCAG), and mentor junior developers while coordinating with VA stakeholders.

Lead design and implementation of scalable backend systems that ingest, process, and serve high-volume health data. Own projects end-to-end, drive integrations with third-party APIs, improve data reliability and observability, mentor engineers, and partner with product, clinical, and data teams to deliver clinically meaningful insights.

Design, develop, test, and maintain cloud-deployable applications using multiple languages and frameworks. Integrate systems via middleware (e.g., SnapLogic), build/consume SOAP/REST services, apply TDD and automated testing, use containers and microservices, perform load and performance testing, and follow Agile/DevOps practices.

Perform systems and software engineering tasks including analysis, design, development, testing, integration, debugging, and documentation. Support API-driven, low-code/no-code BPMN-based automation platforms (Appian, Salesforce, Nintex) with SQL Server and .NET, collaborate with Agile teams, and maintain secure remote work practices for CUI-bearing government projects.

Lead full‑stack development for the Care Journey product, owning design and delivery of GraphQL/Python APIs and React/React Native experiences. Write technical specs, drive large cross‑team projects, ensure HIPAA/GDPR compliance, mentor engineers, participate in on‑call, and deliver performant, scalable systems across web and mobile.

The Software Engineer will modernize the platform, enhance legacy systems, design new services, and collaborate on architecture, leveraging various technologies and engineering practices.

Design, build, and scale Storesight's web applications and services. Lead architecture and implementation of features, maintain integrations and APIs, troubleshoot production issues, reduce technical debt, and mentor engineers while promoting best practices, testing, and deployment in a cloud environment.

Technical leader responsible for designing, building, and maintaining enterprise-scale digital platforms. Provides non-managerial direction to onshore/offshore teams, enforces architecture and coding standards, leads code reviews and CI/CD practices, supports Tier 2/3 incidents, optimizes application performance, and drives continuous improvement across development and operational processes.

As a Sr. Software Engineer at Bloomerang, you will lead technical direction, mentor engineers, and enhance SaaS solutions while utilizing .NET and AI tools. You will ensure scalable, maintainable applications, advocate for Agile workflows, and focus on quality outcomes in software development.

Lead design, development, testing, deployment, and support of cloud-based software products. Provide technical leadership and mentorship, translate feature requirements into implementation tasks, ensure quality (tests, performance, security), resolve technical risks and defects, and collaborate with stakeholders to deliver scalable microservices and AI-integrated features.

Design and architect cloud-first, full-stack, scalable SaaS products; provide technical leadership, mentor engineers, promote automated testing and CI/CD, integrate AI/ML features (LLM/RAG), ensure observability and security, and collaborate with product, operations, and support.

Build and scale a global payments and treasury platform: design and implement resilient, event-driven microservices, client-facing APIs, and distributed systems; work with cloud infrastructure, container orchestration, message brokers, and relational databases to support high-volume money movement and financial ledgers.

The Staff Software Engineer will lead AI integration into software design, develop scalable systems, and mentor other engineers while improving best practices.

Design, build, test, and deploy features for high-traffic web applications across multiple sports reference sites. Work full-stack on CI/CD pipelines and data ingestion, own features/systems, triage production issues, mentor peers, and contribute to technical planning and security/compliance improvements.

The Sr Software Engineer will design, code, test, and document software solutions, lead technical aspects, and support integrations with various IT teams.

The Senior Software Developer will design and develop web and mobile applications, collaborate with scientists, implement APIs, and mentor developers.

The Lead Software Engineer will lead the design and development of enterprise solutions using Microsoft Dynamics 365 and Power Platform, oversee engineering practices, mentor team members, and collaborate with stakeholders for effective delivery and alignment.

Build and maintain full-stack Finance and Business Systems with Ruby on Rails. Own architecture, coding, automated tests, DB tuning, deployments, and production support. Partner with Finance, Operations, and Engineering to create auditable, correct, and actionable unit-economics instrumentation. Participate in on-call rotation, hiring, and documentation.

Lead delivery of high-complexity digital banking implementations: design and build Java Spring Boot microservices, REST APIs, cloud-native containerized deployments, data and DB migrations, event streaming, monitoring and performance optimization. Act as a customer-facing technical lead conducting code reviews, test strategies, and cross-functional coordination to resolve operational issues.

The role involves designing and improving media pipelines for LiveKit's voice technologies, handling media ingestion, exporting sessions, and optimizing performance across diverse formats and codecs.

The Senior Software Engineer will work on full-stack deliverables, manage support tickets, and enhance the tech stack for improved efficiency, focusing on analytics and automation in OOH advertising.