Technical Fundamentals & Core Skills Topics
Core technical concepts including algorithms, data structures, statistics, cryptography, and hardware-software integration. Covers foundational knowledge required for technical roles and advanced technical depth.
Cryptography and Encryption Fundamentals
Comprehensive understanding of modern cryptography and encryption principles used to build secure systems. Candidates should be able to explain the differences between symmetric and asymmetric encryption, appropriate use cases for each, and common algorithms by full name such as Advanced Encryption Standard and Data Encryption Standard for symmetric ciphers and Rivest Shamir Adleman and elliptic curve based algorithms such as Elliptic Curve Digital Signature Algorithm and Elliptic Curve Diffie Hellman for public key operations. Describe hybrid encryption patterns in which asymmetric cryptography is used to protect a symmetric session key, and discuss block cipher modes of operation including cipher block chaining and authenticated encryption modes such as Galois Counter Mode, as well as the role of initialization vectors and nonces. Cover hash functions and integrity checks with properties such as collision resistance and preimage resistance, message authentication codes, authenticated encryption, and digital signatures for authentication and nonrepudiation. Include high level Public Key Infrastructure concepts including certificates and certificate authorities and how certificates are used to establish trust, together with foundational Transport Layer Security and Secure Sockets Layer principles without requiring deep certificate lifecycle management knowledge. Emphasize key management and operational concerns including secure key generation, secure storage, rotation and compromise handling, randomness and entropy sources, recommended key lengths and algorithm lifecycle considerations, and performance and scalability trade offs. Be prepared to discuss common implementation pitfalls and failures such as weak key sizes, poor random number generation, improper key reuse, and lack of authenticated encryption, plus threat models and practical applications including encrypting data at rest and in transit, secure channels, and signing and verification. Avoid deep mathematical proofs unless specifically requested, but be ready to reason about practical trade offs, algorithm selection, and secure implementation patterns.
Technical Depth and Domain Expertise
Covers a candidate's deep, hands-on technical knowledge and practical expertise in their own specialization and their ability to provide credible technical oversight in that area. Interviewers probe the specific patterns, internals, and constraints of the candidate's domain and how the candidate stays current in the field. The concrete sub-areas vary by specialization: for platform, infrastructure, or backend-systems roles this might mean OS internals (Linux and Windows), networking fundamentals (transport and internet protocols, DNS, routing, firewalls), database internals and performance tuning, storage and I/O behavior, virtualization and containerization, or cloud infrastructure and services; for data, ML, or AI roles this might mean model architectures and training dynamics, distributed training and serving internals, feature and data-pipeline design, or statistical methodology; for other technical specializations (sales engineering, technical support, IT business analysis, and similar) this means the specific systems, tools, and technical trade-offs central to that role's own domain. Regardless of domain, candidates should be prepared to explain architecture and design trade-offs, justify technical decisions with metrics and benchmarks, walk through root cause analysis and debugging steps, describe tooling and automation used for deployment and operations, and discuss capacity planning and scaling strategies relevant to their field. For senior candidates, expect both breadth across adjacent areas and depth in one or two specialized areas, with concrete examples of diagnostics, performance tuning, incident response, and technical leadership. Interviewers may also ask why the candidate specialized, how they built that expertise, how it shaped real technical decisions and trade-offs, expected failure modes and performance considerations, and how the candidate mentors others or drives best practices within their specialization.
Problem Solving and Scenario Analysis
Candidates are expected to demonstrate a systematic, structured approach to analyzing and resolving complex scenarios relevant to their field. This includes clarifying the problem statement, eliciting requirements, constraints, and assumptions, and identifying missing information or ambiguous areas. Candidates should decompose complex problems into logical components, prioritize tasks or evidence, generate multiple solution options, and perform trade-off evaluation that balances impact, feasibility, cost, and risk. Core skills assessed include root cause analysis, structured diagnosis of an incident or issue, and reasoning through realistic scenarios drawn from the candidate's own domain (for example, a technical migration, a process breakdown, a customer escalation, a resourcing conflict, or a policy decision). Candidates should define how they would validate a proposed solution (test cases, acceptance criteria, or success metrics), describe how they would monitor or verify the outcome after implementation, and identify opportunities for improvement, risk mitigation, or automation where applicable. Clear communication of the recommended approach, the expected outcomes, and the rationale behind trade-offs made is essential.
Linux System Administration Fundamentals
Core Linux administration knowledge and hands on operational skills required to install, configure, and maintain Linux systems. Covers user and group management, file permissions and ownership, process management and signals, package management across distributions, the boot process and runlevels or targets, basic systemd service control, filesystem navigation and basic disk management, common system configuration files, shell and command line proficiency, and differences between major enterprise and community distributions. Candidates should demonstrate practical troubleshooting of routine issues, patching and updates, and an ability to perform day to day administration tasks reliably.
Certifications and Technical Foundation
Focuses on a candidate's formal qualifications and foundational hands on technical skills. Topics include professional certifications, coursework, and practical lab experience in networking, systems, and relevant toolsets; honest assessment of strengths and learning gaps; examples of hands on exercises or projects that demonstrate core competencies; and plans for continuing technical development. Interviewers will use this to gauge baseline technical literacy and fit for role expectations.
Hardware Components and Troubleshooting
Covers knowledge of fundamental computer hardware components and systematic methods for diagnosing and resolving device problems. Candidates should understand the roles and characteristics of the central processing unit, random access memory, storage devices including hard disk drive and solid state drive, motherboard, power supply, graphics and audio adapters, network interfaces, and common peripherals. Expect familiarity with firmware and firmware interfaces such as the basic input output system and the unified extensible firmware interface, device drivers, firmware updates, and compatibility and upgrade considerations. Troubleshooting skills include identifying symptoms of failing hardware, interpreting system diagnostics and logs, recognizing overheating and power related issues, isolating component failures through substitution and diagnostic tools, using multimeter and built in hardware diagnostics, interpreting error codes from the power on self test, and diagnosing driver versus hardware faults. Also cover escalation judgement, when to replace versus repair, safe handling and static discharge precautions, data preservation strategies before hardware replacement, and communication of findings to stakeholders or vendor support.
Operating System Concepts
Covers general operating system and process management fundamentals applicable to desktop, server, and embedded contexts. Topics include processes versus threads, process lifecycle operations (fork, exec, exit, wait), process and thread states, context switching, scheduling policies and priorities, CPU and memory management, virtual memory and paging, resource utilization and load metrics, common operating system diagnostic and management tools and commands, and trade offs between process isolation and shared memory threading.
Package Management and Software Updates
Covers operating system and language package management tools and processes for installing, updating, and removing software. Topics include common Linux package managers such as apt, apt get, yum and dnf, repository configuration and mirroring, package dependency resolution, version management and pinning, package signing and verification, handling third party and custom repositories, and basic automation of package operations. Also includes routine security and feature updates at the package level and understanding how package upgrades can affect services and dependencies.
Group Policy Fundamentals
Fundamentals of Microsoft Group Policy administration for Windows environments. Topics include Group Policy Objects and the Group Policy Editor, policy application order and inheritance across sites domains and organizational units, scope and filtering including security filtering and WMI filters, common policy categories such as password and account policies, audit policies, software restriction and application control, folder redirection and scripts, preferences versus policies, replication and processing behavior, and troubleshooting techniques using gpresult, event logs, and diagnostic tools to resolve policy application issues.