Top Software Engineer Jobs in Portland, ME

Define and drive Payments technical strategy and architecture for rails, routing, and funds-flow systems. Lead large cross-team initiatives, ensure financial correctness, improve reliability and cost via observability, mentor senior engineers, and align stakeholders across product, risk, and regulatory teams.

Design, build, and operate low-latency authentication and authorization services (OAuth, sessions, tokens, 2FA, account recovery). Lead technical designs, ensure strong security and observability, collaborate cross-functionally, simplify integrations, and mentor engineers while running production services with measurable SLOs.

Lead hands-on full-stack development for Ruby on Rails, TypeScript, and React applications. Shape technical direction, design reliable APIs and data flows, optimize relational database performance, and deliver responsive front-end experiences. Lead projects end to end, mentor engineers, review and refactor code, collaborate cross-functionally, and explore AI-assisted engineering and LLM automation while protecting sensitive healthcare data.

Lead design and implementation of Headway's insurance systems (eligibility, pricing, matching, claims). Build data-intensive, ML-powered platforms and automation, mentor engineers, write high-impact code, and improve accuracy and reliability across state and payer complexity to scale insurance-covered therapy.

Build, own, and operate cloud-native .NET services powering real-time trading, market data, and brokerage integrations. Ship features end-to-end, write tests, participate in on-call rotations, improve observability, and occasionally contribute to React/TypeScript frontend work.

Staff Software Engineer responsible for technical strategy, architecture, complex feature design, implementation, scalability, and greenfield development. The role mentors engineers, leads design and code reviews, drives technical alignment, addresses technical debt, participates in hiring, and remains a hands-on contributor to full-stack enterprise software development using technologies such as PHP, Laravel, Vue.js, and MySQL.

Lead end-to-end feature development across frontend and backend for an enterprise data analytics platform. Design, implement, and maintain React UIs, backend services, APIs, databases, and distributed systems. Collaborate with Product, UX, and Engineering, mentor engineers, improve quality through testing/CI, and introduce new technologies including AI-assisted development.

Design and own CI/CD and configuration management for a large-scale, multi-cluster Kubernetes fleet. Define GitOps-driven, declarative reference architectures and templated production environments. Implement progressive delivery (canary, automated rollback), improve pipeline reliability and speed, evolve the Internal Developer Portal, embed AI tooling into delivery workflows, and partner with Cloud, Security, and Compliance while mentoring senior engineers.

Build and maintain on-chain smart contracts and backend services for branded USDC-backed stablecoins. Own issuance, reserves, mint/burn, and rewards systems; drive architecture, security, and operational excellence; ship features with product and design partners and ensure well-tested, auditable production deployments.

Seeking a Senior Drupal Software Developer to implement custom Drupal websites and mentor a team while ensuring solutions are accessible and responsive.

Own quality engineering for high-throughput payment systems by architecting automated regression, performance, stress, and load testing. Build emulators for external payment systems, integrate quality gates into CI/CD pipelines, validate microservices, event-driven architectures, and databases, and use Prometheus and Grafana for observability. Apply AI-assisted testing, synthetic data generation, and edge-case analysis while mentoring engineers and preventing incidents through telemetry-driven testing and post-mortems.

Build and maintain reliable, secure, scalable backend systems for Lithic’s product platform. Own projects end to end across API key management, reliability, audit logging, search, and API infrastructure. Improve system reliability, reduce technical debt, participate in on-call rotations, and lead team process improvements while collaborating asynchronously across time zones.

Build and operate highly scalable storage infrastructure supporting petabyte-scale imagery data. Responsibilities include developing backend services and APIs, managing object storage and metadata indexing, tuning Elasticsearch, improving disaster recovery, monitoring performance, responding to incidents, contributing to architecture and roadmaps, and advising engineers. The role requires strong production software engineering experience with Go or Python, cloud-native systems, relational and non-relational databases, and highly available services.

Build and deploy integrations between the Bayesian platform and large EHR systems, implement automated integration and end-to-end tests, support production deployments and go-lives, develop tooling and automation (including LLMs), and collaborate with implementation and clinical teams to deliver clinician-facing workflows.

Lead technical strategy and architecture for Affirm Bank's cloud, data, vendor integrations, and operational tooling. Design, build, and operate high-stakes systems end-to-end, own incident response, vendor selection, and the Bank↔Affirm Inc integration boundary. Ensure examiner-ready documentation, compliance, reliability, and observability while mentoring engineers and pushing AI-assisted engineering practices to increase velocity and product safety.

Build and maintain Supabase Lite: implement TypeScript-native backend compatible with PostgREST/Auth and @supabase/supabase-js, extend SQLite support, own CLI/tooling and upgrade paths, ensure compatibility with hosted Supabase, engage partners and open-source community.

Lead architecture and implementation of software for autonomous UAS systems; mentor engineers; ensure compliance with aerospace standards; optimize CI/CD pipelines.

As a Front-End Engineer, you'll create intuitive UIs for AI tools, collaborating with design and backend teams, focusing on performance and user experience.

As a Senior Fullstack Software Engineer at Vanta, you will lead complex projects, set technical direction, design and develop new functionalities, and contribute to the engineering culture while mentoring other engineers.

The Software Engineer will develop and support the MEMX Trading system, focusing on high throughput event-sourcing applications and resolving production issues.

As a Software Engineer III, you'll develop custom software for government clients, teaching Agile practices, delivering software solutions, and ensuring client satisfaction through collaboration and feedback.

The Senior Full Stack Software Engineer will oversee technical development in a B2B SaaS healthcare environment, mentor junior engineers, and lead product features.

As a System Software Engineer, you will enhance GCC/LLVM toolchains for Ubuntu, ensuring modern C/C++ features and improving developer experiences through collaboration and high-quality coding.

Design, implement, and ship end-to-end features across backend services and a React web client for a multi-tenant ERP. Own schema design, migrations respecting row-level security, integrations with platform services, and deliver high-quality, performant code with CI/CD, tests, and code review. Leverage AI coding assistants responsibly and collaborate cross-functionally to evolve shared platform libraries and developer tooling.

The role focuses on optimizing coding practices and collaboration within the engineering team, improving internal tooling, and communicating between teams and leadership.