Software Engineer Jobs in Cambridge, MA

Develop and test autonomy behaviors for unmanned systems using production C++. Implement features for behavior, coordination, motion planning, and survivability. Participate in full software lifecycle, integrate with sensors/actuators, support simulation and real-world testing, collaborate cross-functionally, and travel up to 20% to support integration and testing. Must be eligible for a U.S. Secret clearance.

Design, build and modernize cloud-native services and scalable APIs in an agile team. Collaborate with product and engineers, prioritize user needs, ensure quality via test- and behavior-driven development, and improve performance, reliability, and efficiency.

As a Backend Software Engineer II, you will design and develop APIs, collaborate with teams, and enhance the software lifecycle. You will work with stakeholders to shape system architecture and improve overall software performance.

Build and own full-stack, enterprise-grade analytics and reporting features—from data access and storage to front-end visualizations. Collaborate with Product, Design, Data Science and cross-functional teams to deliver AI-assisted, customizable reporting that drives adoption, retention, and action within the Klaviyo platform.

Design, build, and integrate cloud-hosted full-stack solutions using Java, Spring, Kubernetes, AWS and TypeScript. Define system and product standards, implement CI/CD and observability, champion security and engineering excellence, collaborate with cross-functional teams, and create runbooks and playbooks to support scalable, secure microservice architectures.

Lead technical direction and maintenance of a React Native mobile app for iOS and Android. Improve security, authentication (Okta/MSAL/OIDC), Intune device-compliance, CI/CD and release engineering, dependency and SDK upgrades, automated testing, and documentation. Mentor engineers, partner with Security/DevOps/Product, and own production support, crash triage, and app-store compliance.

Lead high-leverage technical work across teams: define architecture and patterns, drive end-to-end delivery and operational excellence, ship AI-enabled systems, mentor engineers, set AI guardrails, and represent technical leadership internally and externally.

Build and maintain Bazel-based build, test, and packaging tools for a large monorepo. Improve CI performance and cost efficiency, run complex migrations, keep pipelines reliable, and contribute upstream to the Bazel ecosystem. Own projects end-to-end and collaborate with developers to improve tool usability and developer productivity.

Lead diverse technology projects in distributed microservices and full stack systems, mentoring team members and collaborating with product managers on cloud-based solutions.

Lead a team of developers delivering cloud-based Salesforce and full-stack solutions. Drive a portfolio of distributed microservices projects, mentor engineers, collaborate with product managers, and implement integrations using Apex, Lightning, web technologies, SOQL, and REST/SOAP APIs. Participate in architecture, code evaluation, and technology community engagement.

Lead a portfolio of cloud-based, distributed microservices and full-stack projects for Finance Tech. Mentor engineers, collaborate with product managers, drive regulatory and reporting solutions, and leverage languages and cloud/container technologies to deliver scalable financial data products.

Lead technical design and hands-on development of low-latency, event-driven trading and market data platforms. Drive architecture, engineering standards, CI/CD, observability, and AI-assisted tooling; collaborate with product and solution teams; mentor engineers; ensure resilient, secure, cloud-native solutions aligned with enterprise strategy.

Design and deliver developer tooling, core frameworks, and templates to improve engineering productivity. Advance agentic AI tooling (Claude Code, plugins, MCP), strengthen authentication/identity (Keycloak, OAuth2/OIDC), and build/operate services on Java, Spring Boot, AWS, and Kubernetes. Define standards, improve reliability, and partner across teams to drive adoption.

As a Principal Software Engineer, you'll modernize DevX Pipelines, enhance CI/CD infrastructure, and promote software delivery efficiency.

Build developer tooling, framework components, and reusable templates to improve engineer productivity. Contribute to agentic development (Claude Code, plugins, MCP), strengthen Auth/identity (Keycloak, OAuth2/OIDC), and build/operate services using Java, Spring Boot, AWS, and Kubernetes. Investigate reliability and performance, apply standards, and partner across teams.

Design, build, and scale an AI-native conversational platform powering autonomous customer agents. Own full-stack systems, retrieval and orchestration, observability, and multi-channel experiences. Lead technical decisions, mentor engineers, and deliver reliable, tested, customer-facing features that enable brands to launch and improve configurable AI agents.

Build and operate cloud-native security services and platforms. Own components end-to-end, improve availability, scalability, and security of distributed systems, participate in on-call, incident response, design reviews, and deliver tooling, automation, and documentation to improve developer security and reliability.

As a Senior Software Engineer, you will lead user-experience improvements, drive A/B testing, mentor team members, and develop scalable solutions to enhance customer onboarding and success.

As a Senior Software Engineer at Klaviyo, you will design and scale AI backend systems, collaborate with ML engineers, and optimize customer experience through innovative technology.

Build and operate backend and full-stack systems powering AI agent capabilities in Klaviyo Flows. Own end-to-end projects, design scalable async pipelines, REST/GraphQL middleware, and cloud-native infrastructure while partnering with product, ML, and data teams to deliver AI-driven marketing automation features.

Lead a team to develop distributed systems using Golang and Python on Kubernetes, collaborate on AI/ML solutions, and drive technological innovation.

As a Distinguished Engineer, you will lead technical projects, mentor engineers, promote innovation, and provide strategic solutions for complex problems within Capital One's cloud banking environment.

Lead technical implementation of SAP S/4HANA and related infrastructure, design HA/DR architectures, manage datacenter/OS-DB/DNS migrations, integrate enterprise systems, mentor teams, and support AI/automation initiatives while ensuring stability, security, and performance.

Lead technical vision and execution to consolidate legacy publishing onto a cloud-native Publishing API. Translate product strategy into architecture, mentor engineers, design cross-portfolio solutions for document generation/distribution, drive best practices, and be hands-on resolving complex technical challenges across teams.

Lead design and implementation of LLM observability features: prototype and scale product capabilities for tracing, evaluating, and debugging generative AI systems. Work cross-functionally to influence architecture, mentor engineers, prioritize customer pain points, and drive product and engineering decisions for reliable, high-performance AI observability.