Top Senior Software Engineer Jobs in Portland, ME

Designs and maintains automated and manual testing strategies, test suites, and test plans. Identifies and tracks defects, performs API, load, and performance testing, and contributes to feature development and bug fixes. Provides testing guidance, participates in code reviews and planning, supports release quality decisions, and promotes software quality across cross-functional teams.

Design, build, and own production-grade platform subsystems for Stacklok Enterprise, writing Go software that runs on customer Kubernetes environments. Collaborate with leadership, mentor engineers, support customer onboarding and troubleshooting, contribute to the open-source ToolHive project, and translate customer feedback into product improvements. The role also involves improving engineering workflows through AI-assisted development and owning platform areas from design through ongoing production operations.

Leads software design and development for Windows Core OS services and platforms. Partners with stakeholders to define requirements, identifies dependencies, creates design documents, and mentors engineers in producing maintainable code. Drives cross-product project and release planning, serves as a designated responsible individual, participates in on-call operations, and improves system availability, reliability, observability, efficiency, and performance.

Lead the technical vision, architecture, and delivery of Toast’s pricing engine across multiple teams. Design and operate highly available distributed systems, APIs, databases, and event-driven services at scale. Serve as the pricing domain expert, improve correctness and performance, lead incident response and reliability initiatives, mentor engineers, establish operational excellence, and align technical priorities with Product and engineering leadership.

Lead backend engineering strategy for Affirm’s search and recommendation platform. Design and launch highly available distributed systems, guide technical architecture and execution, improve team operations and reliability, establish engineering quality standards, collaborate with product, design, and analytics, and mentor engineers. The role focuses on search, recommendations, consumer shopping experiences, monetization, and scalable platform foundations.

Leads architecture, hands-on software development, deployment, and production issue resolution for strategic customer projects. Drives AI innovation, platform resiliency, security, observability, performance, and operational improvements. Partners with executives, engineering, product, and customer success teams to prioritize strategic programs, improve customer value, share technical best practices, and remove production blockers.

Provides technical leadership for Azure cloud-scale distributed data platforms processing network telemetry and operational data. Defines architecture and long-term technical strategy, leads streaming and batch system design, resolves complex scalability and reliability challenges, oversees production readiness and continuous improvement, and influences cross-team technical investments. Partners across Azure Networking, conducts design reviews, establishes reusable engineering patterns, improves observability and quality, and mentors engineers and technical leaders.

Design, develop, and maintain scalable AI-forward APIs, Model Context Protocol services, and enterprise software for M365 data access. Lead features from concept through launch, create reusable code, estimate and decompose work, monitor production systems as an on-call DRI, improve reliability and performance, and mentor engineers. The role requires strong software engineering experience, backend programming proficiency, RESTful API design, microservices expertise, and experience delivering complex enterprise-scale systems.

Leads architecture, development, and operation of Python-based AWS backend and IoT services. Designs Lambda microservices, REST APIs, event-driven workflows, telemetry pipelines, databases, device communication, and infrastructure as code. Provides hands-on technical leadership through coding, design and code reviews, mentoring, cross-functional planning, security practices, testing, CI/CD, monitoring, incident response, and roadmap development.

Architect, build, and operate large-scale relational and distributed SQL database infrastructure. Responsibilities include database control-plane automation, provisioning, failover, backups, upgrades, zero-downtime migrations, Kubernetes networking, connection proxy optimization, reliability monitoring, capacity planning, and operational support. The role also leads technical delivery, mentors engineers, establishes quality standards, collaborates cross-functionally, and contributes to team roadmap and on-call operations.

Build and scale AI-powered web applications using Ruby on Rails and React. Develop full-stack features, prototypes, and LLM capabilities while independently owning projects from inception through delivery. Collaborate with stakeholders and cross-functional teams, iterate rapidly based on feedback, review AI-generated code, and make sound technical decisions with minimal guidance.

Leads architecture, development, deployment, and operation of scalable Java and Kotlin applications. Responsibilities include backend-focused full-stack development, Kafka data streaming, cloud-native infrastructure, observability, performance optimization, incident response, technical leadership, mentoring, project planning, and cross-functional collaboration. The role also drives AI-assisted engineering practices and modernization initiatives while supporting on-call operations.

Define architectural direction for Azure Specialized platform services and lead the design of highly available distributed cloud systems. Drive reliability, scalability, observability, security, diagnostics, and operational improvements across engineering organizations. Establish service health frameworks, SLOs, metrics, and governance for mission-critical services. Mentor engineers, influence technical strategy, resolve complex cross-system challenges, and advance AI-assisted troubleshooting and platform modernization.

Own the team’s quality strategy, automation architecture, test frameworks, synthetic-data safeguards, CI feedback, and non-functional testing. Design reliable testing for concurrency, asynchronous workflows, and distributed services; diagnose failures across product, automation, data, and environments; and establish AI-assisted quality practices with human oversight. Define risk-based verification, exploratory testing, PHI protections, testability requirements, and residual-risk communication while partnering with Engineering, Product, and Platform.

Design and maintain Anaconda’s internal package build and release platform, improving security, access control, reliability, and operational resilience. Responsibilities include writing software and architecture documentation, reviewing code, diagnosing complex issues, partnering across teams, using AI tools to reduce toil, mentoring engineers, and driving investments that reduce production risk. The role focuses on Python-based infrastructure, platform tooling, DevOps, and SRE practices in a fully remote environment.

Leads the design, implementation, and support of complex, scalable software components and distributed systems. Provides technical leadership through architecture decisions, mentoring, code and design reviews, troubleshooting, and engineering standards. Partners with product, quality, architecture, and DevOps teams on secure cloud-native solutions, CI/CD, observability, performance, releases, and platform modernization. Participates in hiring and communicates technical risks and tradeoffs to stakeholders.

Design and develop software to onboard hardware accelerators and improve cluster-level storage performance. Collaborate across teams, produce design docs, implement and optimize code, perform tuning and RCA, act as DRI, and participate in on-call operations and scaling/validation efforts.

Design and operate high-volume batch and streaming pipelines for cloud usage metering and billing. Build rating logic, data lakehouse systems, Airflow workflows, and production Python and Spark or Flink jobs. Develop reconciliation and data-quality checks with auditable billing trails, while contributing tested code, code reviews, and engineering standards. The role requires deep SQL, cloud, and large-scale data engineering experience.

Design, scale, and maintain high-performance services supporting player registration, authentication, identity verification, fraud and AML screening, geolocation, responsible gaming, regulatory compliance, and communications. The role involves architecting features, optimizing production systems, managing monitoring and integrations, mentoring engineers, handling migrations, and collaborating across teams. Candidates will operate containerized services, support on-call rotations, and build secure, auditable systems using modern web frameworks, databases, event infrastructure, and authentication standards.

Designs and builds cloud-native maintenance planning software for U.S. Navy and defense customers. Responsibilities include modernizing legacy systems, developing data transformations and APIs, designing microservices, implementing identity and access controls, ensuring data quality and compliance, and leading architecture and technical delivery. The role collaborates with government, vendor, platform, and engineering stakeholders, mentors engineers, documents systems, and supports development through production sustainment in a remote environment.

Leads the design, development, deployment, and support of scalable, fault-tolerant software applications. Responsibilities include architecture, coding, debugging, performance optimization, cloud-native and microservices development, Kubernetes operations, production monitoring, incident response, code reviews, technical planning, mentoring, and cross-functional collaboration. The role also contributes to product roadmaps, engineering standards, automation, and on-call support.

Build and maintain scalable billing and monetization systems for subscription, pricing, and payment workflows. Develop large-scale applications using Java, AWS, Lambda, event-driven architecture, REST APIs, and GraphQL. Work with multiple databases, implement automated testing, protect data integrity, and collaborate with internal teams to deliver customer-facing pricing and upgrade experiences.

Lead technical collaboration with an external partner contributing to OpenCTI. Guide architecture, design reviews, coding standards, contribution quality, roadmap alignment, and risk reporting. Contribute directly to the codebase while mentoring internal and partner engineers through code reviews and pair programming. The role requires strong TypeScript and full-stack experience with NodeJS, React, GraphQL, Elasticsearch, and Redis, plus effective communication in a remote, async environment.

Design and build scalable frontend and backend features for route planning, routing, navigation, and route execution products. Partner with product, design, and engineering leadership to improve planner efficiency, leverage AI appropriately, and promote technical excellence. Mentor junior engineers, contribute to team growth, engage with customers, and help scale products across industries and customer verticals.

Leads full-stack software engineering and technical delivery for enterprise applications across the Microsoft .NET and Azure ecosystem. Designs scalable architectures, APIs, integrations, distributed and event-driven systems, and cloud-native solutions. Provides hands-on development, code reviews, troubleshooting, DevOps collaboration, CI/CD, production support, and operational improvement. Mentors engineers, coordinates technical delivery, manages risks and dependencies, and partners with Product, Architecture, Security, QA, and infrastructure teams.