Top Senior Software Engineer Jobs in Portland, ME

Lead design, development, and maintenance of scalable, cloud-native web applications. Own end-to-end product features, mentor engineers, troubleshoot production incidents, improve performance, implement APIs, and support on-call rotations.

Lead platform and infrastructure engineering to improve stability, developer productivity, CI/CD, observability, and shared libraries. Deliver platform projects, mentor engineers, own production availability and on-call, and drive platform decisions and best practices across the org.

Lead end-to-end design and delivery of prototypes and MVPs for a new product initiative. Collaborate with product and success teams for discovery, scope, and iteration; own technical decisions and architecture tradeoffs; incorporate customer feedback and communicate progress to stakeholders.

Lead product and technical discovery for a new initiative, build prototypes and end-to-end MVPs, define metrics and decision processes, rightsize architecture for iteration and integrations, and engage customers for feedback while coordinating external PM/design/business stakeholders.

Design, build, and operate high-scale Customer Care and Identity systems using React, TypeScript, Java/Node.js. Lead AI-first workflows, own end-to-end full-stack features, implement AI-driven efficiencies, ensure security and reliability, mentor peers, and collaborate cross-functionally on integrations and operational excellence.

Lead design, development, testing, and maintenance of scalable data-centric applications using Python, React/Next.js, and PostgreSQL. Optimize schemas and data pipelines, build responsive UIs for analysis and reporting, address performance and security issues, perform code reviews, mentor junior engineers, and drive architecture and technical decisions for the Clinical Operations Platform.

Senior Full-Stack Engineer for Hospitality Fulfillment working on backend services and microfrontends powering SpotOn's Express POS. Own features end-to-end, solve complex high-traffic production issues, integrate AI tools, provide technical leadership, mentor teammates, and work across stack including cloud/infra when needed.

Build and lead development of a customer-facing metric store for high-volume telemetry. Design scalable backend services, data models, ingestion pipelines, and query execution paths. Optimize query performance, storage efficiency, and system reliability. Collaborate with Product, Design, and Operations from architecture through production, mentor junior engineers, participate in on-call rotation, and help define testing, deployment, and operational practices.

The Senior Software Engineer, Mobile will lead the development of a React Native application, enhancing the mobile experience for geospatial data and climate resilience, while ensuring performance and reliability in real-world conditions.

Principal individual-contributor responsible for technical leadership and architecture of a scalable, secure API-driven digital pharmacy platform. Own system design, performance, PostgreSQL optimization, AWS infrastructure, cross-squad mentoring, compliance (HIPAA/SOC2), and prototyping to de-risk platform initiatives.

Design high-performance C++ libraries for automated PCB design challenges, mentoring peers and shaping technical direction while collaborating with experts in various fields.

The Senior Software Engineer will focus on backend development, designing and maintaining APIs and services, collaborating on features, and enhancing integrations at Motion.

As a Staff Software Engineer, you will develop backend architecture, collaborate with stakeholders, mentor juniors, and ensure software quality while leveraging various technologies and AWS platforms.

As a Staff Software Engineer, you will significantly enhance platform development and experimentation, focusing on AI integration and efficient software workflows. You'll manage end-to-end processes, develop core infrastructure, and employ AI coding agents to refine engineering practices, ultimately improving velocity and output quality.

As a Senior Software Engineer, design, build, and maintain backend functionality for scalable multi-tenant services focused on data storage and retrieval. Lead technical initiatives, collaborate across teams, and ensure system reliability and performance.

The Senior Software Engineer will enhance AI system reliability, performance, and scalability, focusing on distributed services and collaborating with ML researchers.

The Senior Platform Engineer will enhance internal tooling, optimize CI/CD pipelines, and ensure AWS infrastructure reliability and security while facilitating fast software development and deployment.

The Senior Software Engineer II will lead projects, define testing strategies, mentor engineers, and improve system reliability at Zippy.

Build and scale the Libraries product UI, designing high-performance web applications that handle millions of packages. Partner with backend, product, and design to deliver end-to-end features, iterate from 0→1, integrate AI-driven workflows, and improve developer experience, performance, and usability.

The Staff Machine Learning Engineer will develop and maintain MLOps tools, optimize model performance, and collaborate on ML system architecture with a focus on enhancing developer experience.

Design and implement core Web3 protocol features and secure smart contracts. Develop and deploy Solidity-based contracts, ensure scalability and performance, review code, mentor junior engineers, and collaborate across teams to integrate blockchain and DeFi solutions.

The Principal Software Engineer at Snout will define architectural direction, build features across the stack, and enhance team effectiveness, ensuring quality and performance.

As a Senior Software Engineer, you'll develop and enhance the Snout web platform, collaborate with teams, and lead technical projects while ensuring performance and reliability.

Define and drive full-stack architecture and technical vision across teams, write high-quality production code, lead zero-to-one projects, productionize ML systems, own reliability and SLOs, mentor senior engineers, and align engineering roadmaps with product and company strategy.

Develop and maintain web and desktop applications using .NET technologies. Requires strong programming skills, experience with databases, and project management.