Why Choose CalCom?
We’re a lean, driven team that takes ownership and delivers real results for our customers. CalCom is built by smart, hard-working people solving critical cybersecurity challenges together. Our customers rely on us to protect their organizations, and we take that responsibility seriously. If you want your work to make an impact and your voice to matter, you’ll fit right in.
Our Positions
Building the Right Way
At CalCom, we believe in building solid, reliable solutions with no shortcuts, no gimmicks. We roll up our sleeves, dive into the details, and focus on doing things right. It’s not always flashy, but it’s what keeps our customers secure.
Employment stability
CalCom attracts people who are in it for the long haul, and it shows. Many of our team members have built their careers here, growing with the company and creating trusted, lasting relationships with our customers. We’re stable, steady, and serious about the work we do.
Growing Together
We're serious about growth, both as a company and as individuals, and expect you to be, too. We’re committed to helping every team member expand their skills, take on new challenges, and build a meaningful career. And while the work is demanding, we make space to connect, unwind, and enjoy the journey together.
Work-Life Balance
Open Positions
Lead Linux Implementation Engineer
Lod, Israel (Hybrid)
Reports to the CTO
Spring 2026
About the Role
We are looking for a hands-on Linux expert to lead the implementation of our solution in enterprise customer environments.
This is a technical, customer-facing role focused on Linux infrastructure, troubleshooting, and security hardening. You will be responsible for deploying, customizing, and supporting our product in real-world production environments.
This role is ideal for someone who enjoys working close to the systems, solving complex problems, and taking ownership from implementation through ongoing support.
Responsibilities
- Lead end-to-end implementation of CalCom’s Linux solution in enterprise environments
- Perform hands-on Linux hardening across large production systems
- Install, integrate, and configure the CalCom CHS platform
- Provide Tier 1 & Tier 2 support, including troubleshooting and issue resolution
- Investigate system behavior related to security policies, OS configurations, and infrastructure changes
- Customize and automate deployments using scripting tools
- Work closely with Product and R&D teams to improve the solution based on real customer needs
- Collaborate directly with customer IT and infrastructure teams
Requirements
- 5+ years of hands-on experience in Linux system administration in production environments
- Strong experience with RHEL / OEL / AWS Linux / Ubuntu
- Proven ability to troubleshoot complex system and infrastructure issues
- Experience with scripting (Bash / Shell / Python)
- Experience with LDAP systems
- Experience with configuration management tools (Ansible / Puppet / Chef)
- Familiarity with enterprise infrastructure (Active Directory, DNS, DHCP)
- Strong communication skills and ability to work with customers
Additional Requirement:
Ability to pass security background checks required for working with financial institutions
Nice to Have
- Experience with Linux hardening (CIS benchmarks or similar)
- Experience with security tools such as iptables, SELinux
- Background in cybersecurity or regulated environments
R&D Manager
Lod, Israel (Hybrid)
Reports to the CEO
April, 2026
About the Role
CalCom is seeking a visionary and hands-on R&D Manager to lead our engineering efforts and drive the technical evolution of our flagship cyber product focused on automated device hardening.
This is a hybrid leadership + hands-on role, combining ownership of product development with direct responsibility for complex customer environments and production support. You will bridge the gap between strategy, execution, and real-world deployments, ensuring our solutions perform reliably in enterprise environments.
You will work closely with the Product team to translate product vision into scalable, secure, and high-performing systems—while also ensuring strong support for existing customers and deployments.
With AI tools rapidly shifting the R&D landscape, you will also lead and orchestrate our AI transformation into aligning our product development to advance and adopt rapid development models.
Responsibilities
- Lead and mentor the R&D team, fostering a culture of ownership, quality, and accountability
- Own the full software development lifecycle, from design to deployment and maintenance
- Work closely with Product and Architecture to translate roadmap into scalable, secure solutions
- Provide hands-on support to enterprise customers, especially in Linux-based environments
- Troubleshoot complex production issues, including failures caused by hardening, upgrades, or infrastructure changes
- Support and oversee deployments at key customers, ensuring stability and performance
- Manage environments across Windows and Linux (multiple flavors), including application operation on Windows systems
- Work with enterprise technologies such as Active Directory, SQL, and IIS
- Write and maintain scripts (PowerShell, VBScript) as needed
- Balance urgent customer needs with long-term product and architectural improvements
Requirements
- 5+ years of experience in R&D leadership roles, preferably in cybersecurity or enterprise software
- Strong hands-on experience with Windows and Linux environments (including hardening and IT Administration)
- Proven ability to support enterprise customers worldwide and troubleshoot complex system issues
- Experienceworking with AI tools, Active Directory, SQL, IIS, and scripting tools (PowerShell, VBScript)
- Strong leadership skills with a hands-on, problem-solving mindset
- Ability to operate under pressure and manage both development and production challenges
- Excellent communication skills in Hebrew and English
- B.Sc. in Computer Science or a related field (M.Sc. – advantage)
This role requires a rare combination of deep technical expertise, customer-facing capability, and leadership. The ideal candidate will be comfortable operating across development, infrastructure, and real-world production environments.