Top Senior Software Engineer Jobs in Seattle, WA

As a Senior Software Engineer, you'll design and build data models, APIs, and backend services for a complex datacenter infrastructure platform, while ensuring high performance and scalability.

The Senior Software Engineer will enhance Kubernetes-native benchmarking services while improving performance and reliability, mentoring junior engineers throughout the process.

Join the Web Product team to develop features for Claude.ai, transform user interaction, and enhance AI collaboration. Full-stack work across frontend and backend.

As a Senior Software Engineer, you will lead frontend initiatives using React and React Native, collaborating with product and design to deliver user experiences, while mentoring teammates and shaping frontend architecture.

As a Senior Software Engineer, you will design and implement AI agents to automate DevOps and DBA workflows, ensuring agents operate safely and effectively in real infrastructure environments.

As a Senior Software Engineer, you will design and maintain software that improves interaction with cloud infrastructure, focusing on AWS, Kubernetes, and Istio, while providing technical leadership and optimizing performance.

The Senior Staff Software Engineer will lead the architecture and implementation of AI-powered developer tools and workflows in a cloud environment. Responsibilities include mentoring, driving innovation, managing project delivery, and fostering a culture of continuous improvement.

The role involves leading the development of backend services for a financial platform, requiring collaborative problem-solving, architectural expertise, and the ability to translate business requirements into technical solutions.

Lead the development of a PostgreSQL-based time-series storage engine, optimizing performance and mentoring a team while maintaining legacy systems.

The role involves porting and validating workloads on new platforms, creating benchmarks and stress tests, and improving performance in AI systems.

The Software Engineer will develop AI-powered cybersecurity products, iterating based on feedback, collaborating with research teams, and engaging with customers to inform product development.

Design, implement, and maintain scalable serverless backend services and responsive Next.js front-end components. Build data scrapers and integrations, improve CI/CD and IaC, mentor junior engineers, and collaborate with product and clients to solve complex compliance problems.

Design, build, and own scalable microservices and secure APIs that transfer value across blockchain and banking protocols. Extend in-house blockchain infrastructure, integrate with banks and cloud services, troubleshoot production issues, document system and testing procedures, and collaborate with product and engineering teams to deliver reliable payment experiences.

As a Staff Software Engineer, lead the architecture and operation of GPU-driven infrastructure, focusing on automation, reliability, and scalability while mentoring engineers and collaborating across teams.

As a backend engineer, you will build AI development tools, design features for LLM performance insight, and manage data pipelines.

Design, build, and iterate on fullstack systems for AI agents. Collaborate with teams to enhance UX and contribute to internal best practices while engaging in research related to AI technologies.

Senior Software Engineer responsible for designing, building, and maintaining the loans platform. Collaborate with product and cross-functional teams to deliver reliable, scalable, and secure services; mentor engineers; improve system performance, observability, and deployment practices.

Design and build omnichannel advertising systems, integrate team capabilities, mentor engineers, and handle end-to-end project ownership.

Design, scope, and implement scalable full‑stack ecommerce solutions. Improve platform performance and usability, collaborate with Product and Design, run experiments, ship features, and ensure seamless integration across the product ecosystem.

As a Senior Software Engineer, you'll design, develop, and maintain full-stack applications, utilizing TypeScript and modern frameworks while collaborating cross-functionally to enhance user experience and performance.

Provide technical leadership for internal platforms and security automation supporting Upstart Bank. Lead architecture, design, and implementation of platform services, APIs, relational schemas, authentication and RBAC systems. Partner with risk, compliance, and operations stakeholders, mentor engineers, mitigate technical risks, and drive long-term platform strategy and engineering standards.

Design, build, and maintain internal software platforms, APIs, integrations, and data workflows that support risk, compliance, legal, and bank operations. Translate stakeholder requirements into scalable architectures, relational data models, authorization and audit systems, and background processing. Produce technical designs, documentation, and contribute to platform-wide architecture and build-versus-buy decisions.

Design and build end-to-end, frontend-led analysis workflows and visualizations for experiment data. Implement UX, APIs, data models, logging formats, and performance/scalability improvements while collaborating with product, design, and customer teams.

The role involves leading key engineering decisions, actively shipping code for the iOS app, participating in product discussions, and enhancing app architecture. Candidates should focus on user experience and product evolution.

The role involves data collection for model training, extending ingestion pipeline infrastructure, and collaborating on dataset roadmap execution.