Top Software Engineer Jobs in Los Angeles, CA

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, implement, test, and maintain real-time/near-real-time software simulation models and system-level simulators for satellite mission rehearsal and operator training. Translate customer requirements, integrate and debug simulation scenarios, collaborate with multidisciplinary teams, and create automation tools for configuration and deployments in an agile CI/CD environment.

Develop high-fidelity spacecraft simulation software in modern C++ and Python. Build multi-physics models covering spacecraft dynamics, thermal systems, attitude control, propulsion, power, sensors, and actuators. Implement solver architectures and time-stepping algorithms for real-time and faster-than-real-time simulation, maintain multi-language APIs, collaborate with engineering teams, and participate in code reviews and planning.

Develop and optimize LensCore, Snap’s augmented reality engine for Specs, Snapchat Lenses, and Lens Studio. Responsibilities include designing C++ features, improving engine performance, collaborating with cross-functional teams to deliver creator-facing capabilities, and contributing to technical planning and specifications. The role requires rendering, 3D engine, computer vision, sensor, or machine learning experience, with preferred experience in modern C++, developer APIs, Qt, and relevant graphics libraries.

Build and maintain frontend platform capabilities for a unified rocket-factory operator UI. Develop React and TypeScript modules, shared components, design-system integrations, and real-time telemetry interfaces. Migrate features from separate frontends, optimize live-data rendering performance, contribute to code reviews, and collaborate with senior engineers on architecture. The role supports industrial automation and launch operations software.

Develop and optimize the C++ LensCore augmented reality engine for Specs, Snapchat Lenses, and Lens Studio. Design features, create technical specifications, collaborate with cross-functional teams, and support developer-facing capabilities. The role requires C++ development, scripting knowledge, Linux command-line experience, and familiarity with AI development tools. Preferred experience includes modern C++, APIs and libraries, Qt, rendering APIs, 3D engines, computer vision, sensors, and machine learning.

Design, implement, and maintain APIs, backend services, and front-end interfaces for mission planning and satellite/ground systems. Lead feature development across the full lifecycle in an Agile DevSecOps environment, emphasizing automation, testing, security, performance, and code quality. Support integration, CI/CD pipelines, and geospatial visualization for defense communications systems.

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.

Build and operate full-stack compliance platforms for transaction search, entity labeling, ingestion, and workflow automation. Responsibilities include designing microservices and event-driven systems, writing tested code, improving sensitive financial data quality, building self-service tools and high-volume pipelines, partnering with Compliance and Risk teams, and participating in on-call operations. The role also involves using AI-powered development tools, reviewing code, and supporting engineering standards.

Develop and scale backend streaming and data infrastructure using Kafka, Flink, AWS, Kubernetes, and related technologies. Break down projects, deliver tested software, collaborate with product and engineering teams, monitor system availability, participate in on-call support, debug code, conduct code reviews, and contribute to team development.

Build, optimize, and maintain software systems using AI while collaborating across disciplines on healthcare technology. Develop distributed, event-driven systems, learn new languages and frameworks, and protect user privacy through data security and HIPAA-compliant practices. The role works with AWS, Kubernetes, and large-scale medical datasets in a fast-paced, mission-driven environment.

Develop Android system applications for Toast’s device management platform, focusing on background services, device policy enforcement, setup, firmware and app updates. Support new hardware and OS upgrades, expand automated testing with Robot Framework, investigate production issues, and collaborate with product, hardware, QA, and software teams. The role requires strong Android development skills in Java or Kotlin, Android architecture libraries, debugging tools, and source control.

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.

Architect and build a high-performance trading platform for active traders. Develop responsive web interfaces integrating real-time market data, low-latency execution workflows, and advanced trading tools. Collaborate with cross-functional engineering teams on large-scale initiatives, emphasizing scalability, performance, API quality, maintainability, developer experience, and end-user usability.

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 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.

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.