The CALLUP team is the secret ingredient to our success. 
We offer great career opportunities for individuals who are innovative, dedicated, and driven to excel.
At CALLUP you have a chance to make a difference.
Contact us at [email protected]

  • Senior Developer

    We are looking for someone who is looking to do something else..
    We seek for a team player to inspire and be the technological leader of the company’s software development team.
    We offer you:
    ·           Great working place with Dynamic environment
    ·           The job has vast content and wide responsibility
    ·           Leading new edge products developments of the company
    ·           Place to grow and develop
    Job description: Senior Software Developer
    We seek for a team player to inspire and be the technological leader of the company’s software development team.
    We offer you:
    Great working place with Dynamic environment
    The job has vast content and wide responsibility
    Leading new edge products developments of the company
    Place to grow and develop
    At least 5 years of experience
    Main programming language: Pure java. 
    Fields of expertise: Servers, multithreading, networking
    C/C++, Delphi, other languages – advantage.
    Mobile OS programming (Android, iOS, others) – big advantage.
    Ability to learn and implement protocols and standards.
    Telecommunication experience: SS7 Signaling, OMA protocols, Diameter and/or RADIUS protocols, Voice applications – big advantage.
    Networking experience (IP, SCTP, UDP, HTTP, proxies) – advantage
    Experience with cryptography – advantage

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  • Technical Support Expert - Israel

    Job Title: Technical Support Expert
    Department: Professional Services

    Location: The position is located in Rosh Haa’yin and reports to Amit Navon

    Job Description:

    An international leading telecom services company is looking for an English-speaking Engineer, highly motivated, creative and innovative professional, to drive support activities for a long-term and full time position, based in Rosh Haa’yin. 

    • Accountable, motivated team player with proven service orientation skills that is enjoying working in various environments.
    • Able to handle and coordinate all customer facing activities in project-related, as well as technical contexts (malfunction, deployment & maintenance)
    • A technical expert, who is able to work independently and effectively in a dynamic environment, and is looking for an exciting professional opportunity.

    Job Requirements:

    • Profound technical background, including:
    o Proven experience with Linux environment - At least 1 year
    o Proven experience with Windows environment.- At least 1 year
    o Proven experience with Networking - At least 1 year
    o Proven experience with IT support environment - At least 1 year
    o Proven experience with servers, storage (HP – advantage) and backup systems
    o Knowledge in DB/SQL. Microsoft SQL server is an advantage
    o Knowledge in telephony and signaling protocols ISUP/MAP/IS41/SIP/SS7/SIGTRAN - advantage
    • High Service Orientation – MUST
    • Experience with supporting large scale telecom customers
    • Able to travel and work in unconventional hours

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  • System Architect - Integration engineer

    Job Description – System Architect – Integration manager

    General information
    Job details Job Area / Job Function
    Position title: Integration Engineer
    Job description
    Install and configure CALLUP products, integrated with customer network and complying with customer and CALLUP requirements.
    Main responsibilities
    • Write technical documentation;
    • Install and configure the solution on hardware;
    • Review the customer acceptance plan documents and updated if needed;
    • Follow the CALLUP process and best practices defined within GGS;
    • Assist the development and validation team during the project;
    • Integrate the solution at the customer site, connecting with customer backend or core network elements;
    • Provide visibility to Validation Technical Leader and Project Manager on his/her work progress (actual and estimated time to complete tasks);
    • Execute the acceptance test plan with the customers;
    • Write the Operation and Maintenance Guide (OMG)

    Required Experience, Skills & Qualifications

    Tools required
    • JMeter
    • SoapUI
    • Linux /SUN Solaris OS
    • Unix/Shell scripts
    • Monitoring (SNMP, JMX, Cacti, Nagios/OP5 Monitoring)
    • Network administration tools (switches, firewall, etc.)
    • VMware usage and admin
    • Oracle 10,11 scripting (PL-SQL/SQL)
    • JavaCard/APDU smartcard protocols analysis
    • Clusterware (Veritas cluster)
    • Back up tools (Veritas netbackup)
    • Volume management (Veritas Volume Manager, LVM)
    • MKS SI/SVN (Configuration Management), Mercurial
    • MKS IM/Jira (Bug tracking)
    • Spy tool/Universal Tracer
    • Internal to CALLUP: STiM, SMSC TOOLKIT; GemSupport Diag; GEMI MS Outlook, Word, Excel, Power Point, Visio

    Technical Skills
    • Unix Systems
    • Shell Scripting
    • Network (LAN/WAN/Web/Security)
    • Log analysis and Troubleshooting
    • Oracle Database Administration
    • SQL Language
    • TCP/IP protocol and client/server architecture
    •  MySQL Database Administration
    • Apache and other webservers
    • Veritas Cluster
    • Weblogic Server
    • Storage (SAN/RAID)
    • Understanding of Java EE
    • SOAP and HTTP protocols

    • Good personal communication
    • Oracle and Written communication
    • Fast Learning
    • Self-Confident and Motivated
    • Ability to work under pressure
    • Result-Oriented
    • Strong Team Player
    • Logical Reasoning
    • Ability to understand and apply priorities
    • Conflict Resolution
    • Customer Relationship
    • problem Solving
    • Independent
    • Initiative

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  • UK Based Project manager

    Job Description: UK Based Project manager
    The Project Manager within CALLUP’s Operations team reports directly to the Director of Service Delivery. The selected applicant will be required to apply project management leadership and oversight to drive the timely completion of projects encompassing SIM OTA, SMSC, Ethernet, WAN, TDM, and SIP, technologies from initiation through to completion. This position requires thorough communication and coordination between all internal departments, as well as with external end users and agents. This position also requires the ability to balance competing priorities, maintain consistent attention to detail, communicate efficiently, self-manage, and adapt quickly in a dynamic environment.

    Core Responsibilities:
    • Responsible for creation of the overall project plan and timeline based on product and scope of work for each assigned implementation.
    • Initiates and maintains customer relationships from receipt of order, through service test and acceptance.
    • Establishes and manages critical dates required for timely completion of service implementations.
    • Evaluates the impact of changes to the overall project plan.
    • Daily task and event management of for all assigned projects.
    • Consistently reviews and validates project deployment plans, identify risks & issues that could impact project timelines and goals, and develop risk mitigation plans in collaboration with management.
    • Schedules and facilitates project calls and meetings, both internal and external.
    • Develops and manages communications and summary reports for various levels of management across multiple departments based on project scope, deployment status, updates, and changes.
    • Provides accurate project status information in the form of formal briefings, project management meetings, and reports.
    • Escalates issues requiring action or decisions to management appropriately, and as necessary.
    • Maintains effective business and field communications and relationships.

    • Bachelor’s Degree from an accredited college or university, preferably in Business Operations/Engineering, or commensurate related work experience.
    • 3-5 years of experience managing multi-organizational technology and/or telecommunications projects.
    • Project Management training, certification, or equivalent experience.
    • Knowledge of project management techniques and tools.
    • Knowledge of order and/or task management systems is a plus.
    • Communication/Organizational Skills:
    •   - Efficient Computer Skills, including use of Microsoft Office Suite (Excel, Word, Outlook).
    •   - Oral and written communication skills.
    •   - Scheduling and Meeting Facilitation Skills.
    • Business Management:
    •   - Decision Making
    •   - Negotiation Skills
    •   - Problem Solving
    •   - Budget Management
    •   - Strong written and verbal communication skills
    • Product/Industry knowledge:
    •   - Understanding of CSR & LSR processes.
    •   - Demonstrated expertise in Telecommunications industry.
    •   - Strong understanding of, but not limited to: SMSC, SIM OTA technologies, Ethernet, WAN,

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  • QA Engineer

    We are looking for to notch QA team player
    We offer:
                Great atmosphere
                Space to bring in new disciplines
                Place of joy mixed with hard work
    The perfect candidate will have total ownership of building, releasing and testing of the Company’s products.
    Testing involves working with various telecommunication technologies, log inspection, writing test and other documents, version tacking and bug reporting.
    1-3 years of manual C/S testing experience
    Degree in a technological field
    Web testing experience a must
    Experience with writing STD/STP documents
    Testing experience (ATP, Regression tests, Sanity tests)
    Knowledge of QA methodologies
    High level English
    Background in telecom/communications – big advantage
    Development skills, compile/build code to release binaries
    Experience with Linux
    SQL experience

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