דרושים » ניהול ביניים » Senior Software Engineer - Security

משרות על המפה
 
בדיקת קורות חיים
VIP
הפוך ללקוח VIP
רגע, משהו חסר!
נשאר לך להשלים רק עוד פרט אחד:
 
שירות זה פתוח ללקוחות VIP בלבד
AllJObs VIP
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
30/03/2025
Location: Netanya and Tel Aviv-Yafo
Job Type: Full Time
We are looking for a talented Senior Software Engineer to join our innovative development team. As a vital part of our mission to deliver leading security solutions, you will contribute to the development of security products that ensure the safety and integrity of our customers' software throughout the entire lifecycle, from code development to runtime operations. If you thrive in dynamic environments, take ownership of features from end-to-end, and are eager to mentor and share knowledge with the team - this is the role for you!
As a Senior Software Engineer you will
Participate in the architecture and development of the Security platform, focusing on cloud-based systems that handle high volumes of data across various components and flows
Write high-quality, testable, and efficient code within our security suite services while ensuring a seamless user experience
Initiate and promote new ideas for continuous product functionality improvements, focusing on high performance and scalability to exceed user expectations.
Requirements:
5+ years of experience in software development, particularly in back-end development
Proficiency in programming languages such as Go, Python or Java
Proven experience in development within complex systems, preferably in cloud-based products, including microservices architecture
Experience in modern CI practices and tools.
This position is open to all candidates.
 
Hide
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8119304
סגור
שירות זה פתוח ללקוחות VIP בלבד
משרות דומות שיכולות לעניין אותך
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
30/03/2025
Location: Tel Aviv-Yafo and Netanya
Job Type: Full Time
With a roadmap brimming with groundbreaking innovations, we are on the lookout for a Senior Back-End Engineer to contribute to this new and exciting venture. This role is ideal for someone who thrives in a dynamic environment, is passionate about delivering high-quality code, and is adept at leveraging the latest technologies to enhance security postures in real-time operational contexts.
As a Senior Software Engineer you will
Participate in the architecture and development of the Runtime Security platform, focusing on distributed systems that handle high volumes of data across various components.
Write high-quality, testable, and efficient code for real-time threat detection, and runtime environment protection.
Initiate and promote new ideas for continuous product functionality improvement, emphasizing the use of Kubernetes for scalable security solutions and leveraging operating system capabilities for advanced tracing and monitoring in runtime.
Requirements:
5+ years of experience in software development.
Go proficiency: A minimum of 2 years experience as the primary programming language
Expertise in one or more of the following areas is required:
eBPF for performance monitoring or security - At least 1 year of hands-on experience
Deep understanding of Kubernetes, including architecting, managing, and implementing Kubernetes environments and objects
PostgreSQL and PostgreSQL DB optimization: At least 2 years proven track record of database optimization and scaling for large datasets
Prior experience in runtime security solutions
Experience in modern CI practices and tools.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8119486
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
15/04/2025
חברה חסויה
Location: Tel Aviv-Yafo
Job Type: Full Time
The Data-Nexus team, a central part of the R&D department, is seeking a versatile Senior Backend Engineer to take part in leading data vision using a lake-house architecture, and building high-scale solutions for handling and consuming the different data assets of the company.
In this role, building on the foundation of classic backend development, youll go beyond traditional boundaries, taking on full product responsibilitiesfrom conceptualization and architecture to design, maintenance, and continuous development. You will collaborate closely with stakeholders across the company to ensure our solutions effectively meet their needs.
The ideal candidate will have strong backend development capabilities, with a deep understanding of designing and managing AWS cloud infrastructure, along with strong knowledge of different data architectures, methods and tools.
Responsibilities:
Design and development of scalable, reliable backend systems and data infrastructure for innovative AI-driven applications.
Collaborate with cross-functional teams, including data scientists, data analysts, product managers, regulatory teams, and other developers, to drive the development of new tools and features that support mission.
Write and manage Infrastructure as Code (IaC) using Terraform and AWS CDK, ensuring robust and efficient cloud infrastructure.
Take ownership of the full development lifecycle, including requirement gathering, design, implementation, testing, deployment, and ongoing maintenance.
Engage with stakeholders to understand their needs and translate them into technical requirements and product features.
Maintain and improve existing backend systems, ensuring they are optimized for performance, security, and cost-efficiency.
Explore and adopt new technologies and frameworks that can enhance the capabilities of the Data-Nexus team.
Develop and maintain high-quality, scalable, and efficient code while fostering a culture of continuous improvement through regular retrospectives and knowledge sharing.
Requirements:
Senior-level experience in backend development, particularly in Python, with a strong focus on cloud data infrastructure and scalable systems.
Knowledge of modern data warehouses or data lake solutions, like Databricks / Snowflake / AWS Athena / AWS Redshift.
Experience with queues and data streaming designs and technologies, like AWS SQS, AWS Kinesis / Kafka, Spark.
Experience with a broad range of AWS services (S3, SQS, SNS, EC2, ECS, EMR, Lambda, EventBridge, RDS, EFS, and EKS).
Strong understanding of distributed systems, microservices architecture, and containerization.
Proficiency in Infrastructure as Code (IaC) tools, including Terraform and AWS CDK.
Ability to take full product ownership from ideation to delivery, ensuring alignment with business objectives.
Excellent communication skills with the ability to work effectively across teams and a customer-oriented mindset.
Familiarity with agile development methodologies and CI/CD pipelines.
BSc/MSc in Computer Science, Engineering, or a related field.
Professional proficiency in English is essential.
Advantages:
Experience with Databricks platform.
Knowledge of the medical tech world, including EHR data and industry regulations.
Understanding of medical knowledge, particularly in radiology.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8139334
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
23/03/2025
חברה חסויה
Location: Netanya
Job Type: Full Time
at the forefront of designing and implementing advanced digital solutions in the healthcare sector. Backed by a dedicated team of experts, is rapidly scaling to meet the evolving needs of healthcare organizations looking to leverage digital technologies for improved patient care, security, and operational efficiency. We are developing a cloud-based infusion management platform to enhance the delivery and monitoring of home and specialty infusion therapies. By providing near- Real-Time data access, it enables healthcare providers (from hospitals to home) to track treatment adherence, review analytics, and support proactive care planning. As a leading provider of healthcare solutions, we are expanding our engineering team and looking for a Senior backend Engineer to join us in delivering high-quality backend services and scalable cloud solutions that power our innovative products. As a Senior backend Engineer, Youll:
* Design, develop, and maintain scalable microservices optimized for performance and reliability
* Research and find innovative ways to process data into insights
* Be involved in all aspects of development, from coding to testing, playing a key role in each project phase
* Collaborate with Product Managers to define and implement product features and requirements
* Ensure high availability of backend services with continuous monitoring and improvements
* Troubleshoot and resolve production issues to ensure minimal downtime and impact
* Contribute ideas and participate in brainstorming sessions to drive innovation within the product
Requirements:
Your Experience & Skills:
* Strong technical skills and a passion for developing features
* Deep familiarity with modern web app development practices and ecosystem
* Ensuring performance and reliability of delivered solutions
* User-centric approach to designing and building software
* Team player, strong communication skills, and empathetic
Areas of Expertise: Databases of every kind | Cloud technologies | data Processing | Cloud security & Identity management | Performance and cost optimization | Microservices architecture
Our Tools & Technologies: Microservices | Python | Typescript | NodeJS | NestJS | PostgreSQL | ElasticSearch | Jest | RabbitMQ | Redis| Kubernetes (K8s) | DataDog If you're passionate about building reliable, scalable backend systems in the cloud and want to make a difference in the healthcare space, wed love to have you on our team.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8106024
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
חברה חסויה
Location: Tel Aviv-Yafo
Job Type: Full Time
Our technology eases the stress of paying for lifes expenses by giving people more options on how and when they pay. Founded in 2016, offers a next-generation, no-fee credit card that can be managed through a powerful mobile app, as well as a point-of-sale payment option available at more than 16,000 service locations, including auto dealership service centers, optical practices, dentist offices, veterinary clinics, and specialty healthcare services. included on the 2022 Inc. 5000 list.

The financial technology company has also been named a Most Loved Workplace, Best Point of Sale Company, and a Top Fintech Startup by CB Insights. We use cutting-edge innovations in financial technology to bring leading data and features that allow individuals to be qualified instantly, making purchases at the point of sale fast, fair, and accessible for consumers from all walks of life. We create value focused on our core values; we work tirelessly to ensure that becomes available to everyone, everywhere.

About the Fraud Prevention Squad:
The Fraud Prevention Squad is a highly skilled and collaborative team of engineers, data scientists, and analysts working to develop cutting-edge fraud detection and prevention systems. The team is passionate about building secure financial products and fosters a culture of learning and mentorship, where everyone is encouraged to share their expertise and grow their skills.

What Youll Do:

As a Senior Backend Engineer on Fraud Prevention Squad, you will play a key role in ensuring the integrity and security of our product offerings. Your main responsibility will be to design, build, and enhance advanced backend systems to detect, prevent, and manage fraudulent activities across all products. You will collaborate with a multidisciplinary team of engineers, data scientists, and data analysts to develop effective fraud prevention strategies and tools. Additionally, you will continuously improve existing technologies, integrate fraud prevention measures seamlessly into our products, and provide mentorship to junior engineers.

Key Responsibilities:
Contribute to the development of our Fraud Prevention Platform, ensuring high-quality products and services.
Solve complex architectural problems, utilizing your deep understanding of system architecture.
Collaborate with other team members, sharing your expertise and facilitating a culture of learning.
Maintain our system architecture, ensuring smooth operation and quality user experience.
Be an advocate for clean, efficient, and maintainable code.
Provide mentorship to junior team members, nurturing their growth and development.
Requirements:
Proficiency in modern system architecture with large-scale and high performance.
Strong problem-solving skills, capable of meeting technical challenges head-on.
A passion for learning, constantly staying up to date with industry trends and technology advancements.
Resourceful, self-motivated, and capable of working independently.
B.Sc in computer science or equivalent.
Proven ability to mentor junior developers, guiding them to reach their full potential.
Effective communication skills to explain complex topics in English
Preferred Experience:
7+ years of experience in Software Engineering, with a focus on system architecture
Experience with software development in Kotlin or Java
Experience with software development in Python
Prior experience in a fraud domain is highly desirable
Experience with a microservices architecture
Experience with AWS
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8140439
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
Location: Tel Aviv-Yafo
Job Type: Full Time
We are a dynamic and innovative team in search of a seasoned Senior Backend Engineer to join our ranks. As a key contributor to our flagship product, you will play a pivotal role in shaping the future of our company. We are on the lookout for a candidate who thrives in a challenging, fast-paced environment and is eager to lead feature development from concept to production.
What you will be doing: 
As a Senior Backend Engineer, you will be at the forefront of feature development, actively participating from the design phase through to production release. Your primary responsibilities include writing code, analyzing data, and contributing to the design and implementation of software. You will take charge of high-impact features that are eagerly anticipated by both new and existing customers. Your expertise will be crucial in maintaining a focus on quality and agility throughout the development process.
Requirements:
Minimum of 5 years of hands-on experience in .NET Framework/Core C# development.
Proficient in multithreading and Object-Oriented programming.
Strong experience with design patterns and a passion for clean code and solid architectures.
Bachelors degree in computer science or an equivalent field.
Additional Qualifications:
Experience with on-premises Windows Server deployment.
Proven ability to lead feature development in an enterprise-level environment.
Familiarity with moving parts of a solution to cloud deployment is highly desirable.
Bonus Points:
Knowledge of Active Directory/Azure Active Directory.
Previous involvement in developing products within the enterprise identity/security domain.
Extensive background in Windows internals, advanced concurrency controls, and operating system objects.
Excellent troubleshooting skills.
Experienced with microservice/event-oriented design and development
Ideal Knowledge Domains:
Enterprise Identity
Security
Disaster Recovery
Backup/Restore
What Sets You Apart: We are looking for someone who not only brings technical prowess but also possesses excellent leadership skills. Your ability to navigate an agile process and guide features from concept to production will be highly valued. If you are a forward-thinker with a knack for problem-solving and an eagerness to contribute to our cutting-edge solutions, we want to hear from you.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8136595
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
02/04/2025
חברה חסויה
Location: Tel Aviv-Yafo
Job Type: Full Time
We are looking for an experienced, hands on Senior software engineer to join our fast growing company and in a breakthrough stage where we build our dream team with the most passionate and professional people in the industry.
our team thinks differently and quickly, delivering high quality and unique code while using the latest technologies and frameworks. All of that without forgetting to enjoy the ride!
What Will You Do?
Take part of all development aspects from design to production of a wide hybrid/ cloud native product
Write high quality, testable and efficient code
Initiate and promote new ideas for continuous improvement of the product functionality
Work closely with other team members as well as mentoring new team members.
Requirements:
Significant real-world experience developing software for production systems
Extensive Can-Do attitude
Hands-on experience and proficiency in Java/ Go (an advantage)
Experience with Cloud infrastructure and services
Exposure and experience to CI/CD/DevOps, Kubernetes, Docker, and monitoring technologies
Ability to take initiative and scope work to deliver value iteratively, making meaningful design decisions, and driving work to completion
Excellent communication skills both verbally and in writing with a passion to mentor, lead, and guide others
Strong testing abilities. Consideration of both automated testing and monitoring to improve team efficiency and reliability of production services.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8125866
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
07/04/2025
חברה חסויה
Location: Netanya
Job Type: Full Time
Required Senior Backend Engineer
Description
We are at the forefront of designing and implementing advanced digital solutions in the healthcare sector. Backed by a dedicated team of experts, we are rapidly scaling to meet the evolving needs of healthcare organizations looking to leverage digital technologies for improved patient care, security, and operational efficiency.
We are developing a cloud-based infusion management platform to enhance the delivery and monitoring of home and specialty infusion therapies. By providing near-real-time data access, it enables healthcare providers (from hospitals to home) to track treatment adherence, review analytics, and support proactive care planning.
As a leading provider of healthcare solutions, we are expanding our engineering team and looking for a Senior Backend Engineer to join us in delivering high-quality backend services and scalable cloud solutions that power our innovative products.
As a Senior Backend Engineer, Youll:
Design, develop, and maintain scalable microservices optimized for performance and reliability
Research and find innovative ways to process data into insights
Be involved in all aspects of development, from coding to testing, playing a key role in each project phase
Collaborate with Product Managers to define and implement product features and requirements
Ensure high availability of backend services with continuous monitoring and improvements
Troubleshoot and resolve production issues to ensure minimal downtime and impact
Contribute ideas and participate in brainstorming sessions to drive innovation within the product.
Requirements:
Your Experience & Skills:
Strong technical skills and a passion for developing features
Deep familiarity with modern web app development practices and ecosystem
Ensuring performance and reliability of delivered solutions
User-centric approach to designing and building software
Team player, strong communication skills, and empathetic
Areas of Expertise:
Databases of every kind | Cloud technologies | Data Processing | Cloud security & Identity management | Performance and cost optimization | Microservices architecture
Our Tools & Technologies:
Microservices | Python | Typescript | NodeJS | NestJS | PostgreSQL | ElasticSearch | Jest | RabbitMQ | Redis| Kubernetes (K8s) | DataDog.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8131951
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
16/04/2025
Location: Tel Aviv-Yafo
Job Type: Full Time
We are seeking a Senior Backend Platform Engineer to join our core engineering team and lead the development of scalable, high-performance backend systems. In this role, youll design and optimize platform services that power large-scale applications. Youll collaborate with cross-functional teams to ensure our systems are robust, efficient, and future-ready.


Your ownership will include:

Design, develop, and maintain backend services, APIs, and microservices.
Optimize performance, scalability, and reliability across the platform.
Collaborate with frontend engineers, DevOps, and product teams to deliver seamless integrations.
Implement best practices in backend architecture, security, observability, and automation.
Work with cloud-native technologies and distributed systems (e.g., Kubernetes).
Develop and maintain CI/CD pipelines for smooth deployments and testing.
Troubleshoot performance issues and resolve production incidents.
Write clean, maintainable, and well-documented code, and participate in code reviews.
Requirements:
6+ years of backend development experience, ideally in platform engineering.
Proficiency in backend languages such as Go, Python, or Node.js.
Experience with cloud platforms (AWS, GCP, or Azure).
Hands-on experience with Docker, Kubernetes, and microservices orchestration.
Familiarity with Infrastructure-as-Code tools (Terraform, Helm).
Knowledge of cloud security best practices and compliance standards.
Strong analytical and problem-solving skills; self-starter attitude.
Experience working with both SQL (PostgreSQL, MySQL) and NoSQL databases.
Nice to Have:

Experience with observability tools (Prometheus, OpenTelemetry, Coralogix, etc.).
Understanding of cloud cost optimization techniques.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8140419
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
Location: Jerusalem and Tel Aviv-Yafo
Job Type: Full Time
We are looking for a Senior Backend Software Engineer to join our R&D office in Tel Aviv. The position is to be part of a development team responsible for our application backend group. The goal of our team is to provide us with a flexible and scalable backend to serve multiple apps and millions of users. You will work on challenging tasks such as new features, stability enhancements, security improvements, infra updates, and performance issues which have a direct impact our services worldwide.

What Youll Do:
Design and implement scalable microservices and APIs using modern tech stacks ensuring high performance and reliability for our ever growing customer base.
Collaborate with product and frontend teams to architect solutions that handle millions of daily transactions.
Design and lead epics within the team and across multiple teams.
Participate in code reviews, mentor junior engineers and contribute to engineering best practices
Drive technical decisions around service architecture, balance trade offs and manage risk.
Define and implement effective cloud infrastructure scaling solutions.
Handle on-call responsibilities and lead incident response when critical production issues arise.
Requirements:
6+ years of professional backend programming experience.
Experience working on complex architectures, preferably distributed systems or microservices.
Experience leading development cycles e2e alongside product and frontend teams.
Familiar with cloud-based serverless deployment (AWS) - advantage.
Expensive experience with databases and SQL - advantage.
Experience working with Python - advantage.
Concise: you get stuff done, in a simple, elegant way.
Fast learner: you can quickly master concepts, disciplines and methods.
Team player with great communication skills.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8126792
סגור
שירות זה פתוח ללקוחות VIP בלבד
סגור
דיווח על תוכן לא הולם או מפלה
מה השם שלך?
תיאור
שליחה
סגור
v נשלח
תודה על שיתוף הפעולה
מודים לך שלקחת חלק בשיפור התוכן שלנו :)
17/04/2025
Location: Tel Aviv-Yafo
Job Type: Full Time and Hybrid work
We are looking for an experienced, passionate Senior Backend Engineer (Platform Team) to join our growing TLV R&D location.
You'll be joining the backend group to help us expand our infrastructure and add new features to the company's core product.
As a Senior Backend Engineer in our platform team, You'll take part in our effort to improve our product, productivity, security and the ability to scale. Opportunity to make a significant impact by driving the technical direction of a high-growth company.
As a Senior Backend Engineer, you will:
Develop and maintain policies and procedures for software development, deployment, and maintenance. Monitor cloud environments using infrastructure as code methodologies
Work closely with other teams, such as development and operations, to ensure that our software applications meet the needs of the organization.
Participate actively in code reviews to uphold high standards of quality and maintainability in software development
Work collaboratively with product teams to design and implement new cloud services and workflows, contributing to the continuous improvement of our platform
Stay up-to-date with emerging trends and technologies in Cloud, and assess their potential impact on our organization.
Requirements:
6+ years of backend engineering experience, ideally with a focus on infrastructure development
Proficiency in Python, with deep knowledge of its ecosystems and best practices
Experience with FastAPI, SQLAlchemy, Alembic and RDS an advantage
Bachelors degree in Computer Science, Engineering, or equivalent experience
Experience in designing, implementing, and maintaining scalable, reliable infrastructure in production environments
Strong understanding of cloud platforms (AWS preferred)
Proficiency with containerization technologies like Docker and Kubernetes
Strong analytical skills with a proven ability to diagnose and resolve complex technical issues swiftly
Ability to conduct research, evaluate new technologies, and integrate them with existing codebases
Excellent communication and collaboration skills, experience working effectively in agile
Highly organized, proactive, and able to manage work independently.
This position is open to all candidates.
 
Show more...
הגשת מועמדותהגש מועמדות
עדכון קורות החיים לפני שליחה
עדכון קורות החיים לפני שליחה
8141887
סגור
שירות זה פתוח ללקוחות VIP בלבד