Here are the top C, C++ 開発者 available for hire in Vietnam in 9月 2025
I am an experienced AI and computer vision professional with 8+ years of experience in developing and implementing cutting-edge algorithms and applications. As a skilled leader with 4+ years of experience managing cross-functional teams, I am passionate about leveraging AI and computer vision to solve complex problems and drive positive change.
👉 12+ years of applicable experience in information technology industry, software engineering & development, including 2 years of working experience as a Scrum Master for manufacturing digital transformation projects ✅ Core competencies: PMP, PMI-ACP, VBA, PCBA, Python, Unity, C#, Manufacturing, Supply Chain 📍 Strong experience in leading teams in Scrum activities, Daily Scrum, Sprint Planning, Sprint Review, & Sprint Retrospective to ensure effective and efficient delivery of all projects 📍 Expertise in combining Waterfall and Agile methodologies 📍 Professional Scrum Master - PSM I 📍 Fluent English communication (both verbal and written) 🧠 Skills & abilities: ● Project Management ● Leadership & Team Management. ● Problem Solving & Communication ● Software Engineering &Development ● Abilities to work under high pressures 🎓 Bachelor of Electrical and Electronic Engineering | Nanyang Technological University, Singapore 💼 PMI-ACP Certificate | Project Management Institute (PMI)
👉10+ years of experience in software development, including 4+ years in the leadership role ✅ Experience in working and collaborating with cross border teams in Japan and Germany
👉7+ years of experience in Software Engineering (both of inhouse and outsource) 👉 Strong in designing and developing complex and large-scale Projects, Systems, Platforms, Web Applications and Mobile Applications ● Ability to handle both backend and front-end tasks ● Dedicated to making a positive impact on both the organization and society ● Lead and manage a medium-sized team effectively, driving success through innovative management strategies. - Dart, Swift, Objective C - Golang, PHP - Android Studio, Xcode - UIKit, Native iOS - Flutter SDK - Golang, Gin / Echo - Restful API, Json - Firebase - Open AI (Rag, Fine tuning, Data generation) - Docker, GitHub / Azure DevOps / Gitlab work ow / pipelines, Microservice, Kubernetes, Kafka, RabbitMQ - PostgreSQL, MySQL - MongoDB - Redis - Google Cloud Platform, Azure Cloud Service, Amazon Web Service AWS - Git (Git shell & Github) - Coding principles: Clean architecture (Go and Flutter), clean code, solid - Architecture patterns: MVC
👉 3+ years of experience in building dynamic, high-performance web applications ● Proficient in TypeScript with a deep understanding of frontend development best practices and the Angular framework ● Adept at creating scalable, maintainable, and user-friendly applications, with a strong focus on optimizing performance and enhancing user experience ● Possesses a solid background in working with RESTful APIs, integrating third-party libraries, and implementing responsive designs using Bootstrap or Material Design ● Experienced in Agile/Scrum environments, with a proven track record of collaborating effectively with cross-functional teams to deliver projects on time and within scope ● Programming Languages & Platforms: C#, .Net Core, TypeScript, JavaScript (ReactJS), NodeJS, HTML5, CSS3, SASS, Angular, RxJS, Ruby on Rails ● CSS Libraries: PrimeNG, Angular Material, Bootstrap. ● Development Tools: Visual Studio Code, Git, SourceTree, Postman, Jira, Azure ADO ● Databases: MySQL & MongoDB.
5+ years of working experience in Information Technology (IT) industry: Data Engineer, DevOps Engineer, R&D Engineer, Cloud Engineer, Backend Developer and Web Developer ✅ Technical skills: ● Languages: Python, C/C++, JavaScript/Typescript, Java, PHP, Scala ● Technologies/Libraries: Pandas, FastAPI/Flask, ElasticSearch, Redis, Spring Boot, MySQL, MongoDB, Cassandra, Airflow, Scrapy, ... ● Devops: Jenkins, Ansible, Docker, Kubernetes, Nginx, Gitlab CI/CD ● BigData: Spark, Hadoop, Kafka, RabbitMQ, Hive, ... ● Cloud: AWS (EC2, EMR, S3, DMS, RDS - Aurora, ECR, VPC, ...), GCLOUD (Basic), Azure (Basic) ● App/Front-end (Basic): Flutter, Android, Angular ✅ Fluent in English communication ✅ Bachelor's degree in Computer Science issued by Hanoi University of Science and Technology (HUST).
👉 20+ years of work experience in IT & Software fields with ability to handle both technologies & management. ✅ 12+ years of technology experience in leadership role (Head of Engineer, CTO, Technical Project Manager, Software Manager, Development Manager) ✅ Experience working with customers from EU (Denmark, Norway, France) and USA in diverse domains: Market research, Insurance Tech, Oil and Gas Industry, Nuclear Plan, Health Tech, Fin Tech, Property Tech, etc. ⚙ Technical skills ✅ Languages & Scripting: Visual Studio.NET, ASP.NET, C#, Visual Basic, Java, RMI, Servlet, JavaScript, HTML, XML, QT4, OIV, QML and plugin component, Web API ✅ Operating Systems: Windows and Linux ✅ Databases: MS SQL Server, MS Access, My SQL, BigData (NoSQL MongoDB) ✅ Web Servers: IIS, Java webserver ✅ Analysis & Design Tools: MS Visio ✅ Design System Architecture, SOA, EBS, Micro service, Dependence Inject, RESTful APIs ✅ Pattern: Singleton, Abstract factory 🎓 Bachelor's degree, major in Computer Science.
👉 20+ years of work experience in IT & Software fields with ability to handle both technologies & management. ✅ 12+ years of technology experience in leadership role (Head of Engineer, CTO, Technical Project Manager, Software Manager, Development Manager) ✅ Experience working with customers from EU (Denmark, Norway, France) and USA in diverse domains: Market research, Insurance Tech, Oil and Gas Industry, Nuclear Plan, Health Tech, Fin Tech, Property Tech, etc. ⚙ Technical skills ✅ Languages & Scripting: Visual Studio.NET, ASP.NET, C#, Visual Basic, Java, RMI, Servlet, JavaScript, HTML, XML, QT4, OIV, QML and plugin component, Web API ✅ Operating Systems: Windows and Linux ✅ Databases: MS SQL Server, MS Access, My SQL, BigData (NoSQL MongoDB) ✅ Web Servers: IIS, Java webserver ✅ Analysis & Design Tools: MS Visio ✅ Design System Architecture, SOA, EBS, Micro service, Dependence Inject, RESTful APIs ✅ Pattern: Singleton, Abstract factory 🎓 Bachelor's degree, major in Computer Science.
👉 19+ years’ experience in IT industry 👉 10+ years’ experience in Project Management, IT Leader roles for providing business solutions (hardware and software) and analyzing business operations ● Fluent in English, both written & spoken ● Solid experience in working with multi-site project teams across time zones ● Excellent communication, leadership, and negotiation skills. ● Provide regular updates on project progress, challenges, and solutions to relevant teams ● Strong problem-solving and decision-making abilities ● Collaborate with quality assurance teams to ensure that developed solutions meet business requirements. ● Flexibility and ability to conform to shifting priorities and timelines ● Strong experience working with international customers/projects ● Knowledge of business analysis process and methodologies, software process management and project management ● Team-working and collaboration with cross-functional teams ● Bachelor’s degree in computer science and mathematics
2+ years of experience in Software Development. ✅ Technical skills ● C++/QT ● QML ● Linux ● Git ● Embedded Software ✅ Certifications: ● [CPP-22-02] CPP – C++ Certified Professional Programmer November 28, 2024. ● [CPA-21-02] CPA – C++ Certified Associate Programmer May 13, 2024 ● Fluent in English.
👉 13+ years of experience in Software Testing (both Automation Testing and Manual Testing) and QA/QC Engineering, including 7+ years in leadership and managerial roles. ● Master in manual testing, strong experience: in automation testing, performance testing, API testing, and database testing, Mobile testing, Website testing. ● Ability to build Java Selenium web driver, automation for website and mobile, create a test script and test suit. ● Strong analytical and strategic thinking abilities, with a focus on delivering high-quality results. ● Well-build Testing Team and process QA depends on the Scrum/Agile method, with a lot of strategies: ground rules, team charter, RACI, Estimation, Timeline, and milestones ✅ LANGUAGE PROGRAM & TOOLS ● Java ● JavaScript and TypeScript. ● Python ● Maven, Jenkin, Cypress, Selenium, Appium, Cucumber, Jira, Confluence, Redmine, Zephyr, Testlink ● C++, PHP, Curl.
👉 20+ years of experience in Software: Project Manager, QA/QC Manager, Scrum Master • Languages: C#, Java, VB, Groovy, Java, Javascript, Gherkin, Html, Xml • Database: MSSQL, MongoDB, PostgreSQL, Oracle • Frameworks: .Net, Selenium, WebDriver, Robot framework, Appium, Cucumber/ Spec flow, JUnit, TestNG, Mocha-chai • Tools: Katalon, NeoLoad, Tosca, Postman, Jmeter, Win Runner, Quick Test Pro, IntelliJ IDEA, Eclipse, Visual Studio, NetBeans. • Analysis & Design Tools: Rational Rose, Mind map, MS Project, MS Visio, Power Design, MS. Office • Source Tools: Visual SourceSafe, SVN, TFS, Drop-box, Box, Git, Figma • Methodology: CMMi5, Kaizen, 6-Sigma, 5S, Waterfall, Agile (Scrum/ Kanban) • Management Tools: DMS Tracker, Jira, HP Quality Center, MS Visual Studio, Qtest, Testlink, Trello, Microsoft Project, Azure • Reporting Tools: Crystal Reports, Excel/Word/P.Point, Power BI, JIRA… • Operating/ Servers: MS. Window, Unix (Linux/Ubuntu), IIS, Share Point 2007, Jenkins, Docker
👉 9 years in IT Support and Software Development. 👉 Nearly 8 years in Automation Testing. ✅ Deep understanding of Agile and strong experience working in Agile-driven environments. ✅ Understanding the product development process, having a sense of product ownership and being passionate about building great products. ✅ 2 years of experiences in programming by C++ and .NET. ✅ Good understanding of popular automation test tools Selenium, UFT. ✅ Superior ability to translate business requirements into functional, non-functional, and technical requirements. ✅ Solid presentation, communication, and technical writing skills, with the ability to convey simple and complex information to technical and non-technical audiences at any level ✅ Solid analytical, system thinking, critical thinking, and problem-solving skills with strong attention to detail 👉 LANGUAGES: ✅ English: intermediate (both spoken and written) ✅ Vietnamese: native.
👉 6+years of experience in experience delivering end-to-end AI solutions across machine learning, deep learning, computer vision, NLP, GenAI and Agentic AI 📍 AI / ML Specializations ● Deep Learning ● Computer Vision ● Natural Language Processing (NLP) ● Generative AI ● Reinforcement Learning ● Large Language Models (LLMs) ● RAG Pipelines ● Representation Learning (Cross/Bi-Encoders) ● Model Optimization (Distillation, Quantization, Pruning) MLOps & Infrastructure ● Docker, RESTful APIs (FastAPI) ● Distributed Task Queues (Celery, RabbitMQ, Kafka) ● Caching (Redis). ● Inference Engines (BentoML, Onnx Runtime). ● Load Balancing (HAproxy, nginx). ● Monitoring (Sentry, Prometheus, Grafana) ● Google Cloud Platform (GCP), VPS Management 👉 Languages, Frameworks & Libraries: ● Python. ● JavaScript, C#, C++, Rust, SQL. ● PyTorch, TensorFlow, Keras ● Huggingface Transformers, TRL, Unsloth ● Numpy, OpenCV, Scikit-learn, Onnx ● Vector Databases (Weaviate, Qdrant) ● PostgreSQL, SQLite, MongoDB.
👉 12+ years of experience in designing, developing, and operating cloud software at scale, with strong hands-on technical and give solutions for the clients ✅ Strong experience in JavaScript/ Typescript and Cloud Computing Amazon Web AWS, and front-end development ✅ Solid experience in designing and developing RESTful APIs, and microservices based systems, troubleshooting and debugging in microservice. ✅ Experience working with Agile methodologies. ✅ Proficiency in developing within a Docker native infrastructure environment. ✅ Fluent business communication skills in English, ability to complete daily tasks in English, including text communication and meetings. ✅ Experience with technical leadership and people management, including the ability to mentor and support other engineers. ✅ Ability to manage risk, ambiguity, dependencies, and cross-functional stakeholders. ✅ Ability to align engineering work with high-level organizational goals. ✅ Good problem-solving and analytical skills.
👉 9+ years of experience in the software engineering & development ● Expertise in building web applications and helping companies and clients develop and optimize their products in systems and websites ● Ability to be responsible for being a mentor for some new members ● Experience in building and managing high-performing, diverse, and maintaining large-scale internet products ● Participated actively with stakeholders and executive teams on technology, business strategy, product roadmap, engineering and corporate culture ● Also have experience in designing scalability, high availability, and high-performance backend systems using Load Balancing, Caching 👉 Frontend: HTML5, CSS3, EJS, Angular, ReactJS, NextJS, Redux, Thunk, Saga, Material UI, TailwindCSS, Mantine, Bootstrap, Storybook, SASS/SCSS, Figma 👉 Backend: JavaScript, TypeScript, NodeJS, NestJS, ExpressJS, KoaJS, Blockchain, Smart Contract, Solidity, Web3JS 👉 PostgreSQL, MySQL, MongoDB, CockroachDB, RESTful, GraphQL, NATS.
👉 8+ years of experience in software engineering, including 5+ years of leading design, development & architect complex product features ✅ Extensive knowledge & experience in developing data products, proficiency in Python and expertise in Docker ✅ Technical skills: ● Languages: Java, C++, C#, Python ● Technologies/Libraries: Spring Boot, Spring Foundation, J2EE, Structs, Apache Foundation, AI, Django, .Net, .Net Core ● DevOps: GIT, Azure Dev Ops, Oracle Cloud Infrastructure (OCI) DevOps, Amazon Web Services (AWS), Docker ● Big Data: RDBMS, No SQL, AI Analysis, Python AI Analysis, Hibernate ● Cloud: Oracle Cloud, Azure, SAP, IBM Cloud, Google Cloud ● App/Frontend/Backend: Swing, FX, QT, Windows Form, Android Java, iOS Swift/ AngularJS, NodeJS, jQuery, ReactJS, Bootstrap, HTML 5, CSS3/Spring Boot, Spring Framework, Structs, Django, Oracle Database 20, 21, 23c, 23AI, MySQL Workbench 6,8. ✅ Excellent communication skills in English & Japanese ✅ Ability to work collaboratively in teams.
👉 13+ years of experience in IT & Software Engineering fields: Embedded Software, Robotics, AI, Consultant, R&D, Full Stack, Data Science, Blockchain, DevOps/DevSecOps, Technical Solution, Software Management, Cloud Architect, CyberSecurity, Big Data/Data Lake/Data Warehouse, DBA, IoT Platform. ✅ Technical skills: ● Development experience with Python and SQL ● Development and operational experience using AWS and Google Cloud. ● Drone/CircleCI CI/CD ● Cloud architecture: Experienced developing a system by using some cloud services on AWS, GCP and Azure ✅ Language skills: ● English: proficient ● Vietnamese: native ✅ Other soft skills: ● Independent studying and researching ● Communication and presentation ● Leadership and management ● Teamwork ● Computer: Windows, Word, Excel, Power Point and technical software, etc. ● Master's degree from Ho Chi Minh City University of Technology, Faculty: Electrical - Electronics Engineering, Major: Automatic Control Engineering ● Fluent in English.
👉 12+ years of experience in software engineering through diverse projects and multiple domains: Ecommerce Platform (eBay, Tiktok, Amazon), Accounting (US), Logistics, SAP, Mobile System (Korea), Finance & Payment (France), etc ✅ Strong in Backend technologies and embedded development. ✅ Deep expertise in Java, REST APIs, Spring Boot, and Algorithm design. ✅ Solid experience with Linux/Android systems, microservices, messaging protocols: Kafka, MQTT, AMQP ✅ Practical knowledge in web technologies (Thymeleaf, Angular, NodeJS), databases (PostgreSQL, ElasticSearch, MongoDB), & tools (Docker, Redis, Amazon S3), OpenAI API. ✅ Familiar with SAP PI/PO, Oracle Integration Cloud, & cryptographic libraries: Java Cipher, OpenSSL. ✅ Programming languages: Java, C/C++, Python, JavaScript, TypeScript, C#, PHP, Dart. ✅ Frameworks & Tools: Spring Boot, Angular, NodeJS, Flutter, Thymeleaf, Elasticsearch, Kibana, OpenCV, Odoo ✅ DevOps: Docker, Linux, AWS ✅ PostgreSQL, MongoDB, SQLite, ElasticSearch.
👉 15+ years of extensive experience in software development and technical leadership. ● Skilled at leading and mentoring high-performing engineering teams (typically 4-8 members), fostering collaborative environments, and driving technical excellence. ● Skilled in consulting, architecting, and implementing robust enterprise-level solutions. ● Expertise across multiple technology stacks, including backend development (.NET, Node.JS, Microservices), Frontend development (ReactJS, AngularJS), and mobile development (Ionic, Flutter). ● Hands-on experience with cloud platforms (Azure, AWS) including services like EC2, S3, Docker, Kubernetes. ● Proficient in CI/CD pipelines, Git to accelerate delivery and enhance product quality. ● Exceptional skills in communicating complex technical concepts to non-technical audiences, negotiating requirements with diverse stakeholders, and building strong relationships to ensure project alignment and successful outcomes.
👉 9+ years of experience in software development and IT product/project management 👉 Leverage technical leadership, solution architecture, AI, and business domain expertise to deliver innovative products and digital transformation, maximizing business value for enterprises and customers 👉 Solution Architect: Proficient in designing and building enterprise-scale Microservices, Event-driven, and Multi-tenant systems 👉 Programming languages: .NET Core (C#), C/C++, SQL/NoSQL , Search engine, Message Broker, Background services 👉 Cloud Platform: extensive hands-on experience with AWS, Azure (cloud-native and hybrid environment) 👉 AI/LLM Intergration: Led the deployment of AI-powered solutions including camera AI, customer identification, intelligent chatbots, and practical applications of LLM/GPT models. 👉 Data Engineering: killed in building and operating data pipelines, data lakes, and real-time analytics systems. 👉 Business Analysis: Deep expertise in ERP processes (Procurement
👉 8+ years of experience in software engineering and development with cross border teams from US and European companies: embedded system design and development, Qt/QML GUI development for cross-platform desktop and embedded systems; and web full-stack design and development through diverse domains and AI platforms ✅ Highly confident in leading teamwork, risk management, and English communication skills in multinational teams ✅ Vietnamese (native), English (Professional TOEIC: 945), and Korean (basic). ✅ Main technologies: C, C#, C++, Python, Java, JavaScript, Qt, Bash shell, Windows Batch, Makefile, CMake, NodeJS, ReactJS, Docker, Linux, Agile, Scrum, etc.
- Application Development - Strong: C#, ASP.NET, Java, JSP/Servlet, Android, Java Script, Jquery, C, C++, Web Service
Viet Tran is a talented full-stack developer with a decade of experience working. He holds a Bachelor's degree from Hanoi University of Technology and has acquired proficiency in multiple tech skills such as Nextjs, Nestjs, Reactjs, Nodejs, AWS SDK, Docker, Kubernetes, and testing tools such as Jest and Cypress. He is also skilled in JavaScript and SQL. At Refinable Marketplace, Viet works as a Full-stack Developer and has expertise in building large-scale blockchain marketplace applications using his Nextjs and Nestjs skills. At Certus SETA International, he developed software to parse and manage medical job orders utilizing Reactjs, Redux, Typescript, S3, and SQS to make services scalable. Viet's side projects include creating a battle card game project using web3, a chatbot using OpenAI, a Nestjs boilerplate, and a ticketing system using Typescript for MongoDB. He has been recognized for his outstanding work and has been certified as an AWS Solution Architect Associate.
Coding languages: C/C++, Typescript/Javascript, Python. (mainly javascript/python) Web application, ⁃ Back-end: Express (Nodejs), Flask (python), Django (python), Twisted (python), Mongoose, SocketIO, MQTT,... - Cloud services: AWS/ Google / Firebase - Architecture: Familiar with microservices, using docker, Kubernetes (Using concept) ⁃ Front-end: ReactJS, NexJS, HTML, CSS, Bootstrap. ⁃ Authenticate/Authorization: OAuth 2.0, Json web token (JWT), Cognito, firebase authenticate service......
With 9 years of work and research in the field of Information Technology. I have skills in Full-Stack Development, Technical Research, Computer Vision, Programing (C#, C++, JavaAndroid). I got a Master's degree in Information Science from the Kyoto Institute of Technology, Japan.
Experienced in software development lifecycle, project management, and DevOps, proficient in C/C++ and Python on both Windows and Linux platforms. Skilled in designing solutions for new technical challenges, capable of addressing complex issues across the entire product system. Passionate about enhancing work efficiency and team development. Currently seeking a software development role to obtain quality and security certifications and contribute to innovative solutions with strong research skills. Also eager to develop project and product management skills.
Learning new technologies is what I am passionate about. I'm also a good member in a team because I like share and learn other, so I tend to work well within groups. Now, I am looking for an opportunity to be exposed to and work with new technologies to improve and develop myself.
to secure a challenging role in a dynamic organization where I can contribute my skills in injection molding and design for manufacturing to deliver innovative, high-quality products that meet and exceed customer expectations.
My objective is to contribute my technical expertise and passion for creating engaging user experiences to an innovative tech company. I am motivated to learn and grow in a collaborative environment and seek challenging projects that expand my skill set. I have 2 years of experience in front-end development using ReactJS, 1 year of experience in NextJS, proficiency in related technologies such as Redux, GraphQL, and HTML/CSS/JavaScript, and proficiency in Figma for UI/UX design. Additionally, I am skilled in back-end development using NodeJS (ExpressJS), MongoDB, Restful API, and Strapi.
I have about four years’ experience working with EPSON customer in three enterprise projects in FPT software. Moreover, I supported other members to understand deeply requirements, design and new technologies and stick closely on the process to assure the quality. I experimented with image processing, socket programming, and multithread in Linux.
BA in University of Social Sciences and Humanities • English language 2. MBA at Solvay Business School • Business Administration
OBJECTIVE Try to learn as much as possible and do may best in order to accomplish my task. Develop my skills with development of company, I want to prove myself.
Passionate Coder. Responsible leader. Best colleague ever. I am a web developer specializing in full-stack development using Laravel framework (PHP), Bootstrap/Foundation front- end framework and jQuery. Experienced with all stages of the development cycle for dynamic web projects. Well-versed in numerous programming languages including HTML5, PHP OOP, JavaScript, CSS, MySQL.
Fith my skills and technologies helped, can organize and building a Website With complete structure )-ull?stack . Continue to eIpand the database, separate lines o- code and controlled code in B/E With spring security, optimized -eatures -riendly With clients in x/E With thymelea-/HTML5/CSS, seeking to -urther improfe HTML5 and CSS3 skills as the -uture -ull stack defeloper.....
Good at English Strong Technicall about Javascript, Typescript, Angular....
Using program language C, C++, C#, Perl, python, Shell script, Makefile. Have three year experience dev with two year working for open source company and one year R&D product for automation company. Build plan and management project. Have knowledge about new technology. Success for build model apply for many type Drone
nearly 20 years experience in software company at developer or technical learder
Senior software developer with 10 years of experience in designing, developing, and testing software applications. Strong knowledge in C++, OOP concepts, Design principles & patterns. Knowledge of advanced level programming in C++ including smart pointers, multithreading, thread synchronization, multi-processing, concurrency, and TCP/IP Socket Programming. Experience in: Java, PHP, Python, Javascript. Database experience: MySQL, SQL Server. Thorough knowledge of game programming, development, optimization, debugging, and troubleshooting methods. Good experience in graphics programming, 3D programming, and mathematics. Good experience in using versioning tools: SVN or GIT. Experienced in working on Agile/SCRUM projects. Good experience in software development on Linux OS environment. Have good experience in using Batch script/Shell script. Experienced in using Azure cloud. Experienced in using docker. Working experience in Qt/Qml
- +5 year of experience with proficient skills: C#, .NET Core, ReactJS, JavaScript, TypeScript,.... - Leadership skill. - Willing to learn. - Fluent English.
- Proficient in NodeJS, Typescript, C#, PHP... - Leadership skill. - Work life balance. - Apply and work with the latest technologies. - Apply and success release big microservice architecture in the fields of finance and e-commerce. - Python direction for AI and ML in the near future. - Good English Communication.
- Result-orientated project manager with more than 5 years’ experience of managing project and product management including coding, configuration, and supporting for .Net products, especially for SharePoint applications. I adapt the requirement quickly and do my best skills to meet the business goals. - Confident, patience and dedication are always in my thought to provide the expertise knowledge in every task. - Proficient in English.
