Top Software Engineer Jobs in Osaka

Build and maintain mobile-first, responsive front-end applications using React and TypeScript. Integrate with REST and WebSocket backends, implement state management, create data visualizations, optimize performance for real-time datasets, translate Figma designs into components, write front-end tests, and collaborate remotely with a global team.

The Software Engineer will design and maintain backend APIs, oversee the API landscape, and collaborate with cross-functional teams on B2B solutions for Speechify's platform.

Develop, optimize, test, and document Soroban smart contracts on the Stellar network for cross-border payment solutions. Integrate anchor services, collaborate with cross-functional teams, debug and support deployments, and stay current with blockchain and payments developments.

Develop and maintain high-security mobile applications using React Native, Swift, or Kotlin. Implement biometric authentication and secure key storage, collaborate with cross-functional teams to deliver features, troubleshoot and optimize performance, and recommend improvements based on emerging technologies.

Implement and optimize EVM-compatible features, reduce gas usage, develop and validate smart contracts, collaborate on Ethereum infrastructure, provide technical support, and stay current with Ethereum advancements.

Design, build, and optimize scalable backend systems for an ads management platform on cloud (primarily AWS). Develop product features and internal tools, maintain core platform reliability and performance, and collaborate cross-functionally with US and Japan teams. Use agentic AI-assisted development practices; work early JST hours Tue–Fri and participate in occasional in-person meetings.

Dragonfly is seeking Software Engineers for various portfolio companies, focusing on crypto technologies. Engineers of all experience levels are needed across multiple stacks.

Seeking software engineers with at least 2 years of production backend experience, interested in crypto and blockchain technologies, for roles with portfolio companies.

Customer-facing software engineer who triages L2/L3 security/network issues for Japanese enterprise accounts, performs packet/log analysis, runs scripted health checks, supports upgrades/migrations, builds escalation packages, documents runbooks, and translates technical communication between Japanese customers and English-speaking engineering teams.

The Software Engineer in Test III will develop and execute automated tests, maintain testing tools, analyze defects, and ensure product testability within TraceLink's software solutions.

Lead backend architecture and build scalable, high-concurrency services and APIs (Node.js) powering web and mobile. Own components end-to-end, manage CI/CD and infrastructure (IaC, containers, cloud), improve reliability, and collaborate with PM/design to deliver core features like live interactions and checkout.

Design and implement open source networking solutions, collaborate with cloud providers, and contribute to technical documentation and community efforts.

As a C# Software Engineer, you'll design and implement classes for document IDE, refactor code for extensibility, and interview users to understand needs.

Join a portfolio company as a Software Engineer to work on a performance-sensitive stack for crypto's dark pool, focusing on full onchain systems.

Build and architect Base360.ai: design and launch booking, pricing, payments, operations, and AI-powered automation. Integrate platforms (Airbnb, Stripe, Twilio, OpenAI), scale systems internationally, and embed AI workflows to automate operations and optimize revenue.

Participate in cryptography research for blockchain applications, focusing on post-quantum signatures, threshold signatures, signature aggregation, and proof systems. Benchmark NIST PQ standards, collaborate with senior researchers to apply results, publish findings, and contribute to open-source projects.

Design, develop, release, and maintain large-scale web and mobile applications for India. Collaborate with product and cross-functional teams, write frontend (React)/backend (Java/Ruby/Python) code, lead architecture and integration decisions, mentor engineers, manage production severity incidents, drive refactoring and best practices, and work with Security, IT Ops, and QA to ensure quality delivery.

Early-career backend engineer role in the Binance Accelerator Program. Contribute to product development and maintenance, write and maintain interface documentation, troubleshoot QA issues, and assist customer service with problem resolution and classification for system improvements.

Design and build backend microservices for real-time fraud detection, transaction monitoring, and risk analysis. Integrate ML models and risk scoring engines, support scalable distributed systems, and leverage AI-assisted development and LLM/agent tools for risk automation.

Design, build, and maintain scalable, reliable Java-based backend systems through full software lifecycle. Work on distributed system design, databases (MySQL and NoSQL), messaging middleware, deployment automation, monitoring, performance optimization, and cross-team collaboration with comprehensive system documentation.

Early-career software engineer in a fixed-term accelerator: develop and maintain core products, compile and implement interface documentation, troubleshoot QA issues, and assist customer support to classify and resolve customer problems for system improvement.

Own quality strategy for multiple applications; design and implement scalable automation frameworks; lead end-to-end testing (functional, integration, performance, security); mentor junior testers; perform root-cause analysis and improve automation stability and test execution at scale.

The Software Engineer will be responsible for data collection to support model training, manage data ingestion pipelines, and collaborate with AI team members on data strategy.

The Senior Software Engineer will design and develop cloud-based Analytics applications, collaborating with domain experts to optimize supply chain operations using Java, JavaScript, and SQL.

As a Forward Deployed Engineer, you will own the execution of major projects, collaborating with customers to deliver tailored software solutions using Python.