Top Senior Software Engineer Jobs in Los Angeles, CA

Drives performance engineering and scalability across software systems by identifying bottlenecks, optimizing code, queries, databases, and architecture, and implementing fixes. Builds performance frameworks, data-generation tools, benchmarks, and CI/CD automation using k6, JavaScript, Grafana, and InfluxDB. Establishes performance standards, investigates distributed systems and cloud environments, documents architectural decisions, and collaborates with engineering teams to improve throughput, latency, reliability, and efficiency.

Lead frontend technical strategy for Affirm’s checkout decision orchestration systems. Design and architect scalable web applications, guide major technical initiatives, improve reliability and operational processes, establish engineering quality standards, collaborate with product, design, and analytics, and mentor engineers. The role focuses on building fast, clear, and reliable checkout experiences using modern declarative UI frameworks.

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.

Designs and builds maintainable, high-performance full-stack applications for digital and physical live-streaming experiences. Integrates front-end applications with distributed backend services using REST and gRPC, develops automation and AI-assisted tooling, makes architectural decisions, collaborates with product and design, participates in code reviews, and mentors engineers. The role requires expertise in modern JavaScript frameworks, state management, backend development, SQL and NoSQL databases, and large-scale software applications.

Build identity, login, registration, and account experiences for Android mobile and Android TV using Kotlin. Develop shared Android SDKs, feature-flagged releases, A/B tests, telemetry, and privacy-related functionality at large scale. Diagnose Android device issues, maintain code quality through testing and reviews, document integrations, and collaborate with product, data science, design, legal, and privacy teams.

Leads software systems engineering for SATCOM mission planning tools supporting space and ground systems. Responsibilities include requirements, architecture, API and backend development, frontend interfaces, integration, testing, deployment, code reviews, security, performance improvements, and technical mentoring. The role requires Python, JavaScript, TypeScript, Agile and DevSecOps experience, an active U.S. Secret clearance, U.S. citizenship, and full-time onsite work in Seal Beach, California.

Build and operate production software for Crunchyroll’s Concepts Lab, turning validated experiments into reliable products. Embed with delivery teams, design systems, maintain CI/CD and testing, manage production health, improve security and scalability, document services, and lead clean handoffs to long-term owners. Mentor engineers and contractors, contribute to hiring, and establish standards for code quality, observability, cost management, and release safety.

Build and improve developer experience across large monorepos by leading framework and language migrations, dependency updates, build and CI improvements, automated refactoring, and agentic engineering workflows. The role identifies developer friction, creates safe automation and guardrails, partners with product engineering teams, measures impact, sets technical direction, and mentors engineers on tooling and codebase health.

Build and operate Dragos’s web application, GraphQL and gRPC APIs, and client SDKs. Develop React and TypeScript features, design versioned API contracts, maintain Python, TypeScript, and Go SDKs, and collaborate with Product, Design, and backend engineering. Improve performance, accessibility, observability, security, testing, and code quality while supporting security data at scale.

Lead development of Toast’s consumer-facing web experiences, building scalable guest and restaurant features across the stack. Collaborate with frontend, backend, iOS, and Android engineers using React, TypeScript, Next.js, APIs, and backend services. Own projects from development through launch, monitoring, and analysis while experimenting with users and influencing consumer product strategy.

Own end-to-end development of customer-facing web platform features, emphasizing React and TypeScript frontend development while contributing to Python backend services. Translate product concepts and designs into reusable, intuitive UI components, partner with Product and Design, engage directly with users, and use AI-powered tools to accelerate development while maintaining code quality and performance.

Develop and enhance Ferguson’s custom Trilogie ERP system across multiple functional areas. Responsibilities include designing business-process solutions, owning software projects through implementation, integrating APIs and web services, collaborating with analysts, product owners, QA teams, administrators, and vendors, writing unit tests, reviewing code, and optimizing performance in high-transaction environments. The role also supports Trilogie’s migration from Unix to Linux and requires extensive UniBasic or Pick-based development experience.

Design and implement C++ features for MongoDB’s replication infrastructure, improving availability, recovery, consistency, performance, and fault tolerance. Diagnose distributed-systems issues, develop comprehensive tests, collaborate across engineering teams, participate in design and code reviews, and mentor junior engineers. The role involves owning technical work from investigation through delivery and contributing to major MongoDB releases.

Develop and maintain MongoDB server workload resilience infrastructure in C++ or Rust. Design workload policies for rate limiting, prioritization, overload mitigation, availability, and performance. Write unit and integration tests, investigate failures, improve observability, diagnose and fix complex distributed-system issues, and lead technical projects. Collaborate across engineering teams, mentor junior engineers, participate in hiring, and improve operational readiness, monitoring, incident management, and rollout processes.

Lead the design, development, and operation of integrations and API products. Establish standards for API contracts, authentication, authorization, versioning, reliability, observability, documentation, and developer experience. Drive cross-team system architecture, production readiness, scalability, security, and resilience while mentoring engineers and aligning technical decisions with product and business goals.

Lead frontend feature releases and own user experience, performance, testing, and production health for a React and TypeScript dental practice management platform. Collaborate with backend engineers using Java Spring Boot, develop AI-powered interfaces, integrate AI tools such as Claude, participate in code reviews, improve team efficiency, and estimate development work for timely delivery.

Build, ship, and maintain scalable iOS features used by millions of users. Responsibilities include writing Swift code with modern iOS frameworks, designing reusable components, managing asynchronous workflows, improving performance and reliability, debugging production issues, contributing to architecture and testing strategies, participating in code reviews, and collaborating with product, design, and engineering teams through release and iteration.

Designs, develops, configures, tests, documents, and supports Guidewire ClaimCenter and related applications, integrations, tools, and systems. Responsibilities include production support, incident and problem management, troubleshooting, root cause analysis, release management, technical design, automated functional and performance testing, code reviews, mentoring junior developers, vendor liaison work, and collaboration with architecture teams. The role requires independent judgment, leadership, SDLC expertise, and strong Java, .NET, JavaScript, SQL, Oracle, and testing capabilities.

Leads the design, configuration, development, integration, testing, deployment, and production support of Guidewire InsuranceSuite applications for Property and Casualty insurance. Translates business requirements into secure, scalable solutions; directs technical design and code reviews; supports integrations, incident resolution, root cause analysis, releases, and continuous improvement. Mentors engineers, maintains technical documentation, and promotes Agile, DevOps, quality, security, and enterprise architecture standards.

Build foundational advertising account systems for Netflix Ads, including advertiser data models, account hierarchies, enrichment, verification automation, cohort assignment, spend attribution, and customer-facing APIs. The role involves designing scalable, multi-tenant, API-first cloud services with strong governance, reliability, observability, and operational excellence. Engineers will make zero-to-one architectural decisions supporting sales workflows, media planning, programmatic integrations, and advertising growth.

Own and develop a TypeScript monorepo spanning Next.js, Expo, and Cloudflare Worker applications. Build secure PostgreSQL and Prisma systems, webhook handlers, background jobs, authentication, encrypted financial data workflows, and AI-powered financial features. Responsibilities include production ownership, incident response, code review, and ensuring reliability, security, idempotency, and data isolation across web and mobile products.

Designs, builds, and operates scalable internal applications, backend services, APIs, integrations, and automated employee workflows. Owns solutions from architecture through deployment and support while improving reliability, observability, performance, and maintainability. Collaborates across engineering, product, design, security, and People Technology teams; provides technical leadership through architecture reviews, code reviews, mentoring, and roadmap contributions. The role also explores AI-powered capabilities to improve employee workflows and engineering productivity.

Build and ship end-to-end product features across an author analytics dashboard, marketing site, free tools, billing, email, and AI-assisted functionality. Design data models and APIs, integrate third-party services, develop production LLM features, and maintain testing, monitoring, performance, and observability. The role includes code review, technical documentation, independent product decisions, and close collaboration with the founder in a remote-first environment.

Design, build, and maintain blockchain and payments infrastructure; develop scalable microservices and secure RESTful APIs to transfer value across blockchain and banking protocols; integrate with banks and fintech; own system design, testing, deployment, and troubleshooting; ensure reliability, code quality, and strong test coverage while collaborating with product and engineering teams.

Leads development of resilient, scalable features across Toast’s enterprise Sports and Entertainment platform, including backend, frontend, and POS systems. Responsibilities include designing, deploying, testing, monitoring, and maintaining production services; leading complex technical projects; collaborating with Product, Design, Customer Success, Sales, and other teams; mentoring engineers; and using AI tools to improve development productivity.