Top Software Engineer Jobs in Los Angeles, CA

Design and build full-stack web applications, backend APIs, data models, pipelines, developer tooling, and platforms for mission and flight software systems. Develop interfaces with flight software and simulations, support test automation and continuous deployment, and establish scalable engineering practices for a growing software organization.

Build full-stack applications supporting rocket design and manufacturing operations. Develop responsive front ends, scalable back ends, data pipelines, telemetry analysis tools, production planning systems, and real-time dashboards. Participate in the full software development lifecycle, including requirements gathering, design, implementation, testing, deployment, and iterative improvement. Collaborate with design, manufacturing, supply chain, test, and factory-floor teams while following agile, continuous integration, and continuous deployment practices.

Build full-stack applications supporting rocket design and manufacturing operations. Responsibilities include developing responsive front ends, scalable back ends, data pipelines, telemetry analysis tools, production planning and supply chain applications, and real-time manufacturing dashboards. The role covers the full software development lifecycle, including requirements gathering, design, implementation, testing, deployment, continuous integration, and iterative improvement with engineers and factory operators.

Develops and verifies vehicle management flight software for aerospace and autonomy platforms. Responsibilities include translating requirements into software designs, integrating functions, building simulation and hardware-in-the-loop environments, creating automated test frameworks, executing manual and automated V&V activities, supporting CI/CD, investigating defects, maintaining technical documentation, and coordinating verification across multifunctional teams. The role is fully onsite and requires an active U.S. Top Secret clearance, U.S. citizenship, and up to 10% travel.

Develop and maintain native iOS applications using Swift and SwiftUI for DraftKings’ financial platform. Responsibilities include building user-facing features, integrating APIs, managing data and state, optimizing performance, monitoring crash analytics, participating in code reviews and testing, and troubleshooting reliability issues. The role collaborates with product, design, analytics, and engineering teams to deliver scalable, compliant mobile experiences.

Lead the development of foundational iOS platform systems, shared frameworks, developer tools, architecture standards, and multi-quarter migrations across Cash App and Square. Drive performance, reliability, security, testing, observability, release safety, and AI-assisted development practices. This hands-on individual contributor role influences multiple teams, develops technical leaders, and partners broadly to improve iOS engineering quality, productivity, and product outcomes.

Build and launch backend identity decisioning systems that validate consumer identity and satisfy KYC regulations. Collaborate with Product, Compliance, Auth, Fraud, Analytics, and engineering teams; decompose projects, write tested and extensible code, monitor system metrics, support availability and on-call operations, debug code, participate in reviews, and contribute to technical decisions and team development.

Build and own foundational Android platform infrastructure, including architecture, shared libraries, tooling, observability, performance systems, and developer experience. Lead cross-organizational technical initiatives, establish Android engineering standards, evaluate AI-assisted development tools, and build AI-powered platform capabilities. Collaborate across mobile, web, backend, product, and design teams while mentoring engineers and driving large-scale organizational impact.

Staff Android Software Engineer responsible for owning Cash App’s foundational Android platform, including architecture, shared libraries, infrastructure, developer tooling, observability, performance, and experimentation systems. The role drives AI-native engineering practices, leads cross-organizational technical initiatives, establishes standards, mentors engineers, and partners across mobile, web, backend, product, and design teams. Requires deep Android expertise and organizational-level impact.

Build and deploy full-stack healthcare financial products used by millions of patients. Develop AI- and ML-powered features, integrate LLMs, enhance an AI billing assistant, and create patient payment solutions. Collaborate with product, design, and partner engineering teams to deliver production-ready software. Contribute to technical planning, coordinate complex development efforts, mentor peers, and maintain high standards for testing, code quality, efficiency, and technical debt management.

Designs, develops, tests, integrates, debugs, and maintains non-embedded software for classified defense programs. Translates customer requirements into software architectures, interfaces, algorithms, and designs; supports system integration and lifecycle processes. The role also handles technical issues, improves development processes and metrics, conducts software research, and ensures compliance with quality, safety, regulatory, and customer standards. Work involves Java, ReactJS, DevOps tools, Agile methodologies, and classified-program environments.

Design, build, scale, and operate high-volume payment APIs and distributed systems serving global traffic. Lead complex engineering projects from requirements through production, improve reliability, performance, observability, fault tolerance, and security, and participate in on-call and incident response. Collaborate across product and engineering teams, use AI-assisted development tools responsibly, and mentor engineers through technical reviews and documentation.

Design, build, test, and operate mission operations software for the Mars 2028 spacecraft, including command generation, validation, sequencing, telemetry processing, data dissemination, interfaces, visualization, and data pipelines. Develop automated testing and validation frameworks, support simulation and hardware-in-the-loop testing, document external APIs and data formats, and collaborate with mission operations, flight software, instrument teams, and external partners. Shift work and on-call availability are required during critical mission phases.

Design, build, scale, and operate high-volume payment APIs and distributed systems serving global traffic. Lead complex engineering projects from requirements through production, improve performance, observability, reliability, fault tolerance, and security, and participate in on-call incident response. Collaborate across product and engineering teams, use AI-assisted development tools responsibly, and mentor engineers through technical reviews, documentation, and guidance.

Develop and deploy customer-focused web, mobile, and backend applications across the full software stack. Design major features, contribute to architecture decisions, conduct code reviews, and ensure secure, high-quality implementations. Collaborate with stakeholders and cross-functional teams using Agile and SDLC practices. Manage version control, CI/CD, environments, and releases; maintain automated test coverage and perform root-cause analysis. Build and optimize relational data solutions using SQL Server, including complex queries, stored procedures, and performance tuning.

Develop and maintain distributed spacecraft ground control software in Elixir, including satellite command and control, mission planning, mission data processing, and data analysis systems. Participate in architecture, design, and code reviews while collaborating across engineering disciplines. The role involves solving greenfield problems involving resilient, fault-tolerant, concurrent, and real-time distributed systems.

Build and improve full-stack software for engineers operating mission-critical hardware. Responsibilities include developing React and TypeScript/JavaScript interfaces, contributing to backend services and APIs, creating reliable data flows, debugging across systems, writing tested code, and collaborating on greenfield products. The intern will work closely with software engineers and operators while gaining experience across frontend, backend, databases, and hardware-connected systems.

Design, build, deploy, and support scalable Java microservices on AWS. Provide technical leadership, architectural direction, code reviews, troubleshooting, proof-of-concept development, and cross-functional collaboration. Work with high-throughput data, messaging systems, distributed architectures, observability, and AI-assisted development tools. Participate in on-call support, mentor engineers, lead architectural initiatives, and deliver reliable SaaS platform features.

Lead the architecture and evolution of native iOS foundations supporting seller-facing applications. Identify systemic problems, define platform strategy and standards, build prototypes and reference implementations, lead multi-quarter migrations, and establish practices for quality, testing, observability, release safety, and maintainability. Develop senior engineers and create scalable ownership models across teams.

Develop and maintain telemetry and command database schemas, data models, APIs, services, pipelines, and database-backed applications for spacecraft and flight-test systems. Translate engineering requirements into reliable data solutions, implement automated validation and testing, optimize database performance, troubleshoot data pipelines, support CI/CD and migrations, and collaborate with systems, flight software, test, database, and mission operations teams.

Architect, build, and optimize a full-stack platform using React.js, Node.js, GraphQL, REST APIs, and SQL databases. Lead technical decisions, performance optimization, observability, testing strategies, and cloud-based deployments. Mentor engineers, conduct design reviews, evaluate technologies, and drive initiatives across multiple teams while collaborating with product, QA, customers, and leadership.

Design, develop, and support AR engine and Lens Studio features for Snapchat and Specs. Build agentic development workflows and tooling, contribute to architecture and technical roadmaps, participate in reviews, and collaborate cross-functionally. Improve code quality, reliability, performance, security, maintainability, and developer productivity while integrating AI-assisted and agentic capabilities into software systems.

Own the development and maintenance of large-scale React Native applications for iOS and Android. Lead architecture improvements, React Native upgrades, native module development, performance optimization, automated testing, CI/CD reliability, and production debugging. Collaborate with cross-functional product pods, contribute to technical discovery and architecture, mentor engineers, and raise engineering standards while delivering scalable, maintainable mobile experiences.

Design, build, and operate foundational developer infrastructure across CI, build systems, deployment orchestration, and test platforms. Improve build speed, deployment safety, and test reliability while owning services end to end, including SLOs, observability, and on-call responsibilities. Partner with engineering teams to address platform pain points and lead cross-cutting technical projects through production.

Develop and maintain software requirements, architecture, algorithms, interfaces, APIs, backend services, and user interfaces for SATCOM mission-planning systems. Work throughout the Agile and DevSecOps lifecycle, including design, coding, integration, testing, deployment, code reviews, automation, security, and performance improvements. Support CI/CD pipelines, Kubernetes optimization, databases, geospatial visualization, and software for space systems and ground segments.