About the role
Commit builds software products for clients across embedded, IoT, SaaS, AI/ML, e-commerce, mobile, and web. We’re looking for a Senior System Engineer with a strong mobile focus to sit at the intersection of analysis, design, and hands-on delivery — turning business and system requirements into clear architecture and detailed design, then helping build it. You’ll analyze requirements, own the High Level Design (HLD) and Low Level Design (LLD) — including mobile app architecture — and stay hands-on (~50% of your time) as a full-stack developer across a React, Node.js, React Native, and .NET stack, with React Native and mobile at its core. You’ll partner directly with clients (including large enterprise and banking environments).
What you’ll do
- Analyze system and business requirements — elicit, clarify, and structure them into clear, complete, and testable specifications.
- Own the High Level Design (HLD), including mobile app architecture: system structure, components, integrations, data flows, and non-functional requirements.
- Produce the Low Level Design (LLD): detailed module and API design, data models, and sequence flows, ready for implementation.
- Stay hands-on (~50%): write production code full-stack — React, Node.js, .NET (C#), and React Native — with mobile at the center of what you build.
- Partner with product, architects, developers, and QA to translate designs into delivery and keep requirements, design, and implementation aligned.
- Uphold engineering standards: code reviews, testing, and secure-by-design practices across the solution.
Must-have qualifications
- 6+ years in software engineering, including hands-on system analysis and design.
- Proven experience in system requirements analysis — eliciting, specifying, and structuring requirements for non-trivial systems.
- Proven experience authoring HLD and LLD documents (architecture, component and API design, data models, integration and sequence diagrams).
- Strong mobile development background — hands-on production experience with React Native and mobile app architecture (navigation, state management, offline/sync, performance, native-module integration, and app-store delivery).
- Full-stack experience — production-level command across frontend (React), backend (Node.js and .NET / C#), and mobile (React Native), able to write production code, not just review it.
- Solid grasp of software architecture patterns, API/service design, and system integration.
- Strong handling of non-functional requirements — performance, security, scalability, and reliability —and secure-by-design practices.
- Fluent with modern dev tooling: Git, JIRA, Jenkins.
- Professional-level English.
- Excellent interpersonal and communication skills.
Nice to have
- Native mobile experience (iOS / Swift, Android / Kotlin) alongside React Native.
- Cloud experience (Azure / AWS) and microservices or messaging (e.g. gRPC, RabbitMQ, Kafka).
- Familiarity with modeling and diagramming tools (e.g. UML, C4) for HLD/LLD.
- Experience with AI-first development (Claude Code, Cursor).
- Experience working in large organizations (e.g. banking / financial services).
Skills Required
- 6+ years of software engineering experience, including hands-on system analysis and design
- Experience eliciting, specifying, and structuring requirements for non-trivial systems
- Experience authoring High Level Design and Low Level Design documents, including architecture, component and API design, data models, integration, and sequence diagrams
- Production experience with React Native and mobile app architecture, including navigation, state management, offline synchronization, performance, native-module integration, and app-store delivery
- Production-level full-stack experience with React, Node.js, .NET/C#, and React Native
- Understanding of software architecture patterns, API and service design, and system integration
- Ability to handle performance, security, scalability, reliability, and secure-by-design requirements
- Fluency with Git, JIRA, and Jenkins
- Professional-level English
- Excellent interpersonal and communication skills
- Native mobile experience with iOS/Swift or Android/Kotlin
- Cloud experience with Azure or AWS and experience with microservices or messaging technologies such as gRPC, RabbitMQ, or Kafka
- Familiarity with UML or C4 modeling and diagramming tools
- Experience with AI-first development tools such as Claude Code or Cursor
- Experience working in large organizations, including banking or financial services
What We Do
Commit is a global tech services company with offices in Israel, US, Canada, UK, and Europe. The company was founded in 2005 and has over 700 multi-disciplinary innovation experts who serve a broad range of companies, from small startups to large enterprises in multiple business sectors. Commit specializes in advanced technologies and applications with dedicated practices in Cloud, GenAI, Software, IoT, Big Data, Cyber, Collaboration, Data center migration projects, and more. Commit offers innovative, end-to-end technology solutions by developing custom software and IoT platforms for clients looking to build their next-gen products within the modern ICT world. Commit’s complete and comprehensive engineering powerhouse of resources, and proprietary Flexible R&D methodology helps transform its clients’ technology visions into high-quality products while reducing costs and improving time-to-market.
