Paysera Tech

About us:

Paysera is the first fintech company in Lithuania and an EU-licensed e-money institution. We provide fast, convenient, and affordable financial services globally. Our services range from a payment gateway for e-shops, a finance management app, money transfers, and a parcel locker network.
With over 1 million app downloads and growing, we aim to become an industry-leading super app that provides financial and lifestyle services across the globe. At Paysera, we are a start-up-minded team, which means we thrive in a fast-paced environment and seek open communication while placing great focus on upholding our core company values. Join our vibrant international team of over 700+ people across 20+ cities, worldwide.

Role Overview

Title: Linux System Administrator
Level: Senior
Team: IT Infrastructure (6 members)
Reports To: Head of IT Operations
Purpose: To manage, secure, and optimize Paysera’s global Linux-based infrastructure, ensuring high availability, scalability, and security for all core business services across multiple data centers.

Key Responsibilities

• [R1] Manage and maintain ~400 Ubuntu/Debian-based virtual machines in production using VMware ESXi, Proxmox, and KVM.
• [R2] Support and optimize MariaDB, PostgreSQL, InfluxDB, Redis, and RabbitMQ in production environments of multi-terabyte scale.
• [R3] Monitor infrastructure health using Zabbix, Prometheus, InfluxDB, and APM tools, ensuring SLA uptime compliance and incident resolution within defined response times.
• [R4] Troubleshoot infrastructure-related incidents, escalating as needed, and perform planned maintenance with minimal downtime.
• [R5] Automate deployments and configurations using Ansible, Terraform, and Helm for consistent and repeatable environments.
• [R6] Implement and maintain operating system security hardening measures and integrate with SIEM solutions for proactive threat detection.
• [R7] Participate in installing and configuring basic infrastructure services for a new data center.
• [R8] Lead the migration of core business services between old and new data centers with zero critical service downtime.
• [R9] Document system configurations, SOPs (Standard Operating Procedures), and change logs for audit readiness.
• [R10] Collaborate with cross-functional teams to align infrastructure changes with business continuity plans.

Must-Have Requirements

• [Q1] Minimum 4 years of Linux system administration in production environments with 100+ servers
• [Q2] Proven experience with virtualization platforms (VMware ESXi, Proxmox, KVM) managing 100+ VMs concurrently.
• [Q3] Proficiency in administering DBs MariaDB, PostgreSQL, Redis.
• [Q4] Ability to write and maintain automation scripts in Bash, Python, Go, and use Terraform & Ansible for infrastructure-as-code.
• [Q5] Solid knowledge of the OSI model and experience with ACLs, VPNs, and firewalls at a junior-to-mid level.
• [Q6] Demonstrated experience with infrastructure monitoring tools (Zabbix, Prometheus, InfluxDB) for environments with 99.9%+ uptime targets.
• [Q7] English language skills at B2 level or higher for technical documentation and cross-team communication.
• [Q8] Stable career history with average tenure of 2+ years per role over the past 5 years.

Nice-to-Have Qualifications

• [N1] Experience deploying and managing Kubernetes clusters and Docker containers.
• [N2] CI/CD pipeline management experience using GitLab CI.
• [N3] Administration experience with cloud platforms (AWS, GCP).
• [N4] Experience configuring and managing CDN services such as CloudFlare or Akamai.
• [N5] Production experience with RabbitMQ and Kafka

Work Conditions & Contract Info

• [W1] Employment type: B2B contract or Direct Employment.
• [W2] Location: Fully remote across the EU; hybrid (3–4 days/week in office) for Office-based candidates.
• [W3] Core hours: 08:00–20:00 EEST (flexible scheduling within this window).
• [W4] Contract length: 1+ years.
• [W5] Compensation: €15–€25/hour gross, depending on qualifications.
• [W6] Optimal Start date: 2025-09-01.
• [W7] Interview process: 1-2 stages.

Paysera is the first fintech company in Lithuania and an EU-licensed e-money institution. We provide fast, convenient, and affordable financial services globally. Our services range from a payment gateway for e-shops, a finance management app, money transfers, and a parcel locker network.
 With over 1 million app downloads and growing, we aim to become an industry-leading super app that provides financial and lifestyle services across the globe. At Paysera, we are a start-up-minded team, which means we thrive in a fast-paced environment and seek open communication while placing great focus on upholding our core company values. Join our vibrant international team of over 800+ people across 20+ cities, worldwide.

• Title: System Analyst

• Level: Mid to Senior

• Team: SA Competence Center; staffed into domain tribes (Transfers & Payments, Platform Solutions, Cards Processing, Mobile Application, Web Shell, eCommerce)

• Reports To: Head of SA Competence Center (matrix); in-tribe to Delivery Manager

• [Q1] Experience: 3+ years in IT as a Business Analyst and 1+ year as a System Analyst in multi-system environments.

• [Q2] Domain depth: Hands-on experience in at least 1 domain (Transfers & Payments, Accounting/Ledger, Card Processing, KYC/AML, Loans/Deposits, eCommerce/Payment Gateways, or similar fintech).

• [Q3] Modeling proficiency: 3+ years delivered artifacts using UML/BPMN (use case/sequence/state/activity).

• [Q4] NFR specification: Demonstrated ability to define SLOs (e.g., p95 latency, throughput, rate limits, HA targets) and embed them into stories. 

• [Q5] Tooling: Daily use of Jira, Confluence, draw.io, Swagger/OpenAPI, Postman,  SQL (SELECT/JOIN/window functions). 

• [Q6] AI Adoption: Practical experience and active daily usage of AI tools, models, and assistants to empower personal performance and productivity.

• [Q7] Communication: English B2+ (speaking and writing) for stakeholder facilitation and documentation.

• [R1] Translate requirements into functional and non-functional specifications with unambiguous, testable acceptance criteria in Jira/Confluence using Gherkin where applicable.

• [R2] Break down epics/features into right-sized user stories with DoR.

• [R3] Leverage AI assistants for drafting/validating specifications, generating test cases, impact analysis, and documentation consistency checks.

• [R4] Model system behavior with UML/BPMN (use case, sequence, state, activity) for key flows across user actions, integrations, and transactions using draw.io or similar services, utilizing AI tools for diagram generation, validation, and consistency checks.

• [R5] Specify APIs and contracts by producing versioned OpenAPI/Swagger specs, example payloads, and error models; validate with Postman and mock servers before development.

• [R6] Design cross-system integrations (REST/gRPC/event streaming) with data mappings, idempotency, and retry/backoff; document constraints (rate limits, p95 latency targets) using Kafka/RabbitMQ, JSON/Protobuf.

• [R7] Define non-functional requirements for performance, availability, security, and observability (e.g., p95 < 500 ms, 99.9% uptime, time-to-detect < 5 min), tracked as explicit stories in Jira.

• [R8] Ensure regulatory alignment by mapping PSD2, PCI DSS, AML/KYC, GDPR, DAC, SEPA, SWIFT CSP/OpenBanking

• [R9] Maintain documentation quality by keeping Swagger, Confluence, and data dictionaries consistent.

• [R10] Drive delivery via refinement, planning, and estimation; facilitate workshops, clarify edge cases, and unblock teams; 

• [N1] Payment standards: ISO 20022, SEPA Instant, SWIFT MT/MX exposure.

• [N2] Compliance translation: Practical experience mapping PSD2, GDPR, AML or KYC, or PCI-DSS controls to system behavior.

• [N3] Cards & security: Scheme integrations (Visa/Mastercard), PCI DSS audit support experience.

• [N4] Architecture literacy: Working with microservices and modular monoliths, patterns such as CQRS/event sourcing.

• [N5] API & integration design:1+ years end-to-end integrations across REST/gRPC/event streaming with OpenAPI/Swagger, Postman; familiarity with Kafka/RabbitMQ.

• [N6] Observability: Using Graylog/Grafana/Sentry to support troubleshooting and define log/metric needs.

• [N7] Data modeling: ER modeling and SQL performance tuning for analytical queries.

• [N8] Certifications: IREB or IIBA or ISTQB, or BPMN 2.0 Practitioner, or Data Modeling/ERD (completed or in progress).

• [W1] Employment type: B2B; contract term 1+ years with 3–6 months probation.

• [W2] Location/arrangement: Remote or Hybrid; candidates within ±3 hours of CET.

• [W3] Core hours/timezone: Collaboration overlap within CET business hours (minimum 4 hours/day).

• [W4] Start date: ASAP.

• [W5] Compensation: €23–€30 Euro/hour gross, depending on qualifications.

• [W6] Interview process: 2–3 steps plus a test task (case-based specification exercise).