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DevOps Engineer

Cossack Labs
format:Hybridcompany:Product
linuxnetworkingbashpythonrubyany one ofpythoncc++gorustany one ofccryptographydockerkvm
terraformpostgresqlmysql
test task:yes
domainCyberSec
locationUkraine (Kyiv, Lviv)
> full description

This position is open only to Ukrainian citizens within Ukraine (preferably Kyiv or Lviv).

The Infrastructure & Hardware Team is seeking a DevSecOps superfan as we continue our purposeful, long-term growth, built on a stable and dedicated team. We welcome candidates at all experience levels — from junior to senior.

We take on mission-critical projects where security is at the heart of everything. If building fortress-level infrastructure excites you, welcome aboard. We put strong emphasis on developing our new team members, offering an extended onboarding period, a clear PDP, and direct involvement from the Department Head from day one. Tell us where you can add value, and we will provide the tools, knowledge, and support for you to succeed.

What makes you a great match

  • Learning is something you do with intention, not by accident.
  • Strong communication skills are a must — if you can say it clearly, we can build it quickly.
  • You actually have different passwords for different websites and applications (bonus points for using MFA).
  • Strong logical thinking (by the third page of the detective story, you already know who the killer is).
  • In addition to knowing how things work, you also want to know why they work that way.
  • Failures don’t stop you — you learn from them to keep moving towards your goal.
  • You have the persistence to complete the “boring” parts of the job like, writing technical documentation or running tests.

What you’ll do

  • Participate in security assessments.
  • Design and implement hardened systems.
  • Enhance SSDLC for our products.
  • Participate in formulating internal procedures, standards, and workflows.
  • Plan, build, and maintain infrastructure.
  • Experiment with unconventional tasks.
  • Collaborate with a team of talented engineers when doing everything above.

Requirements

  • Good knowledge of Linux systems and networking.
  • Understanding of the main Internet systems and services.
  • Good skills in programming in at least two scripting languages: Bash and (Python or Ruby).
  • Basic experience in at least one of the non-scripting languages: C/C++/Go/Rust.
  • Understanding of key software development principles and lifecycle.
  • Basic knowledge of main cryptography and security protocols, algorithms, approaches and instruments.
  • Familiarity with Docker and KVM.
  • Sufficient knowledge of English to write perfect documentation and security reports.

Nice to have

  • Familiarity with IaC tools and approaches.
  • Some experience with at least one of PostgreSQL/MySQL.

Hiring process

  • Resume review — 5-7 business days.
  • Pre-intro questionnaire review — 3-4 business days.
  • Introduction call with the Head of Infrastructure & Hardware Engineering.
  • Test task — 2 hours working with virtual machines.
  • Technical interview with several team members.
  • Background check.
  • Offer discussion.

What we offer

  • Opportunities to work across technologies and projects: cryptography, software engineering, information security, ML security controls, cryptographic protocols, hardware protection, reverse-resilient mobile apps, and web apps for millions of users.
  • Quarterly performance reviews, regular one-on-one meetings with your manager, and ongoing support to help you succeed and grow professionally.
  • Quarterly compensation reviews, aligning pay with performance and market benchmarks.
  • Performance and reward bonuses.
  • 21 business days of vacation, plus sick, mental health, and emergency days to use when genuinely needed.
  • Combination of in-office and remote work as needed, flexible scheduling, and a winter slowdown period.
  • Conferences, books, courses, internal knowledge sharing, workshops, writing blog posts and research papers, giving talks, and contributing to open-source parts of our products — choose what aligns with your professional goals.
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