Top Software Engineer Jobs in Leon

Design, build, and maintain scalable brokerage systems supporting international markets. Develop Go-based backend services, gRPC microservices, React interfaces, and vendor integrations. Collaborate with global engineering teams to support multiple languages, currencies, and markets. Lead regional reliability efforts, act as incident commander, troubleshoot production issues, mentor engineers, and contribute to recruitment and cross-functional initiatives. Participate in on-call support and help ensure proactive 24x7 system stability.

Build and maintain frontend and backend features for AI-centric web applications. Implement interfaces from designs, integrate REST and GraphQL APIs, work with databases, debug issues, and write unit and integration tests. Follow Git, security, and development standards; participate in code reviews and stand-ups; communicate blockers; and use AI tools to improve business processes and development efficiency.

Build and maintain end-to-end web applications powering sales and operations. Design tools for quoting, scheduling, and fulfillment, integrate AI into products, collaborate on UX, ship high-impact features, and contribute to architecture, deployment, and engineering culture.

Lead architecture, development, and maintenance of scalable React Native iOS/Android apps. Optimize performance, integrate REST/GraphQL APIs, ensure test coverage and secure mobile practices, contribute to CI/CD and release processes, mentor engineers, and collaborate with cross-functional distributed teams.

Lead design and development of scalable Ruby on Rails backend systems, optimize PostgreSQL performance, implement third-party integrations, ensure test coverage, contribute to deployment/infrastructure (Docker/Kubernetes/CI-CD), mentor engineers, and collaborate with product and design to deliver reliable SaaS and API solutions.

Lead design and development of scalable Node.js backend systems, implement REST/GraphQL APIs, optimize PostgreSQL, build async/event-driven workflows, ensure security, testing, observability, CI/CD, and mentor engineers while owning complex technical initiatives.

Lead frontend architecture and development using React and TypeScript, build reusable components, integrate with REST/GraphQL backends, ensure performance, accessibility and test automation, mentor engineers, and contribute to CI/CD, containerized deployments, and technical documentation to improve scalability and maintainability.

The Sr. Software Engineer will enhance Backblaze's storage platform by improving durability and throughput while managing software development lifecycle processes.

Build and ship end-to-end UI and backend features for Protege's internal dashboard and customer portal in a TypeScript/Next.js codebase. Design complex, data- and media-heavy workflows, optimize streaming and previews, implement APIs and data models (Postgres, AWS), ensure secure handling of sensitive data, mentor the team, and turn UI patterns into reusable design-system components.

Design, implement, and scale Rust services and libraries for trading, payments, and crypto. Build reliable, high-performance distributed systems, collaborate on architecture, write testable async network code, and own production systems end-to-end.

Seeking a passionate Rust Developer to work remotely on projects involving Rust and PostgreSQL. Applicants should have coding experience and strong English communication skills. Familiarity with React and performance optimization tools is a plus.

Build and deploy production software for B2B fintech customers, owning features from design through monitoring and maintenance. Engineers may focus on backend-leaning product development or data and machine learning systems for risk, fraud, and spend intelligence. The role emphasizes AI-native development practices, strong software fundamentals, collaboration with Product and Design, ownership, and rapid learning in a multicultural environment.

Develop and configure ServiceNow applications, workflows, catalog items, integrations, and platform features using JavaScript and ServiceNow APIs. Build Now Assist AI skills, agents, and automated workflows; integrate external systems; collaborate in Agile delivery; test and release solutions; and support platform upgrades, performance, and security. The role requires ServiceNow module experience, CSA certification, ITIL knowledge, and strong troubleshooting skills.

The Senior Software Engineer will design and operate data ingestion and processing systems for multimodal data, ensuring quality, security, and compliance while optimizing for performance and reliability. Responsibilities include building pipelines, handling messy data, and partnering with teams to enhance the platform's capabilities.

Own and deliver backend features across the Ecosystem team: design, code, unit test, debug, and tune services. Implement REST APIs, instrument for monitoring, fix CI/production issues, collaborate with frontend, infrastructure and domain teams, and build automation for CI/CD.

As a Senior Software Engineer, you will design and develop software applications, mentor team members, and contribute to building innovative solutions in a fast-paced environment.

Develop and maintain automated testing solutions using Java, JavaScript, and Python. Translate acceptance criteria into technical documentation and automation scripts, integrate tests with frameworks and CI/CD pipelines, and validate functional requirements across test and UAT environments. Prepare test plans, scenarios, and cases; perform BDD, black-box, functional, and business-process testing; report project progress; troubleshoot issues; and mentor team members.

Lead software quality initiatives for an engineering squad by designing test strategies, building production-grade automation, improving test coverage, tracking quality metrics, and coaching engineers on TDD and testability. Develop unit, integration, contract, and end-to-end testing solutions across web, mobile, and APIs. Use AI to generate tests, detect flaky tests, identify coverage gaps, and accelerate feedback. Write documentation, influence team practices, and own quality improvements end-to-end.

Own end-to-end onboarding features: design and build backend services for KYB/KYC, document collection, verification orchestration, and account activation. Implement frontend UI to reduce friction, integrate third-party identity providers, collaborate with Product/Risk/Compliance, apply AI tools to automate workflows, and elevate team quality through code reviews and pairing.

Design and drive reusable, scalable backend architectures and APIs. Lead development of microservices and event-driven systems on AWS, mentor engineers, modernize legacy stacks, ensure observability and security, participate in on-call incident response, and collaborate with product, design, and cross-functional teams.

Design, build, and operate high-performance API-first backend services for a real-time consumer engagement platform. Ensure system uptime via on-call rotations, observability, CI/CD, containerized deployments, and modernization of legacy services while collaborating with product and infrastructure teams.

Build and ship fullstack features across backend services and frontend experiences for technical interviewing and assessment. Develop AI-powered systems involving LLM orchestration, streaming, tool calling, and multi-provider integrations. Improve internal engineering tooling, observability, reliability, and technical architecture. Participate in code reviews, mentor engineers, support planning, respond to incidents, and contribute to on-call operations in a remote-first team.

As a Staff Software Engineer, you'll design and deliver a core data platform, focusing on architecture, pipeline components, and AI integration. This hands-on role emphasizes creating production code and establishing technical standards within a small team.

As a Senior Software Engineer at Osmind, you will influence architecture, own product challenges, support fellow engineers, and partner with cross-functional teams to enhance mental healthcare through technology.

Lead complex software design and development tasks, translate product requirements into designs, write and review specifications, implement best practices and code reviews, resolve complex bugs, design data models, and collaborate with stakeholders to deliver product solutions.