Jobs at Djinni

A backend-focused engineering position on a transformation project for an international travel company. The engineer will own features end-to-end - from planning and design through building, testing, and release.

Key Responsibilities 

-Own features end-to-end (plan, design, build, test, release) 

-Build and maintain Ruby on Rails systems 

-Contribute to full-stack work (Rails-heavy, with frontend involvement as needed) 

-Write tested, high-quality code 

-Use AI coding agents to maximize efficiency 

-Participate in code reviews 

-Maintain systems and resolve production issues 

-Collaborate with Product, Design, and Quality Engineering teams

Required Qualifications 

-Proficiency in Ruby on Rails with production experience 

-Strong database schema design and data modeling skills 

-RESTful API design experience 

-PostgreSQL and AWS infrastructure knowledge 

-Demonstrable experience with AI coding agents, or strong enthusiasm to adopt them 

-Good English 

-Team-oriented with strong communication skills 

-Pragmatic about speed/quality/scope tradeoffs

Tech Stack 

-Ruby on Rails, PostgreSQL, AWS, Next.js, Vercel. Trunk-based development with CI/CD and multiple daily deployments. 

Nice to Have 

-E-commerce or travel platform experience 

-An eye for UX/design 

-Travel enthusiasm

We offer:

• Attractive financial package

• Challenging projects

• Professional & career growth

• Great atmosphere in a friendly small team

RedCore is an international business group that creates technological solutions for digital markets. Our products and services cover fintech, marketing, e-commerce, customer service, communications and regulatory technologies. 

We are looking for a Monitoring Manager to join our team!

Requirements:

- Understanding of the basics of search engines;
- Ability to search for necessary information on different GEO;
- Basic knowledge of Google docs/sheets, Google Analytics.

Will be plus:

- English language skills

Responsibilities:

- Collection and processing of data in areas requiring monitoring.
- Prompt submission of complaints when violations are identified.
- Interaction with platforms/support regarding complaint review processes.
- Analysis of identified violations and their classification by type and priority.
- Interaction with platforms/support regarding complaint review processes. (duplicate in original text)
- Tracking the effectiveness of submitted complaints and their outcomes.
- Maintaining and updating an internal database of websites.
- Researching new methods for submitting complaints.

What are the conditions and bonuses?

☘️An exciting and challenging job in a fast-growing product company, the opportunity to be part of a multicultural team of top professionals in Development, Architecture, Management, Operations, Marketing, Legal, Finance and other;

🤝🏻Great working atmosphere with passionate experts and leaders, sharing a friendly culture and a success-driven mindset is guaranteed;

📍Beautiful offices in Warsaw, Limassol work remotely or on-site with comfort and enjoy the opportunity to build a network of connections with professionals day by day;

🧑🏻‍💻Laptop & all necessary equipment for work according to the ecosystem standards;

🏖Paid vacations, personal events days, days off;

🫖Paid sick leave;

👨🏻‍⚕️Medical insurance;

💵Referral program enjoy cooperation with your colleagues and get the bonus;

📚Educational support by our L&D team: internal and external trainings and conferences, courses on Udemy;

🗣Free internal English courses;

🧘Sport benefit;

🦄Multiple internal activities: online platform for employees with quests, gamification and presents for collecting bonuses, RedCore talks club for movie and book lovers, board games cozy evenings, special office days dedicated to holidays;

🎳Company events, team buildings.

Team Lead Infrastructure / NOC-SRE Lead

We are hiring for our partner — an international crypto payments company — and are looking for a Team Lead Infrastructure / NOC-SRE Lead to lead an infrastructure and production operations team.

This is a hands-on leadership role: you’ll manage the NOC / Infrastructure / SRE team, improve operational processes, own incident management and escalations, while staying technically involved in complex Linux, networking, and database troubleshooting.

What you’ll do

• Lead and develop the NOC / Infrastructure / SRE team

• Organize shifts, on-call rotations, escalations, and team coverage

• Own incident management: alerts, routing, SLA/SLO, escalation, and postmortems

• Drive RCA and problem management

• Build and improve operational processes in Jira, Confluence, KB, and task trackers

• Improve monitoring, alerting, and observability

• Coordinate with Development, QA, DevOps, and Product teams

• Take hands-on involvement in complex production incidents

• Troubleshoot Linux, networking, and databases at L3 level

• Create and maintain documentation, runbooks, procedures, and operational standards

• Mentor engineers and ensure the quality and consistency of the team’s work

• Continuously improve infrastructure reliability and operational efficiency

What we’re looking for

• Previous experience as a Team Lead, NOC Lead, Infrastructure Lead, or SRE Lead

• Proven experience managing and mentoring an engineering team

• Experience supporting production and business-critical services

• Strong background in incident management and escalation processes

• Practical experience with RCA, postmortems, and problem management

• Solid Linux administration background

• Strong networking fundamentals: TCP/IP, routing, DNS, DHCP, NAT, VPN

• Experience with monitoring and alerting tools such as Zabbix, Grafana, Prometheus, Alertmanager, New Relic, Splunk, or similar

• Experience with Jira, Confluence, knowledge bases, or similar tools

• Ability to build effective processes without unnecessary bureaucracy

• Willingness to remain hands-on, not purely managerial

• English sufficient for technical documentation and communication

Nice to have

• SRE background

• Kubernetes / Docker

• Terraform / Helm / GitLab CI

• Cloud experience: GCP / AWS / Azure

• PostgreSQL / MySQL

• MikroTik / L2-L3 switches / VLAN

• Experience with 24/7 production operations

• Background in fintech, crypto, highload, or e-commerce

If you’re an experienced infrastructure leader who can combine team management, operational excellence, and deep technical expertise, we’d love to hear from you.

We are hiring for our partner — an international crypto payments company — and are looking for a strong Senior Linux System Administrator to join their production infrastructure team.

You’ll work on a B2B crypto payments product, supporting reliable and secure production infrastructure. This is a hands-on role focused on Linux, networking, infrastructure troubleshooting, system performance, and production stability.

This is not a Helpdesk, Windows/M365, or end-user support position.

What you’ll do

• Administer and maintain production Linux servers

• Perform L3 troubleshooting across Linux, networking, services, and databases

• Monitor and troubleshoot CPU, memory, disk, I/O wait, inodes, load average, and systemd

• Work with TCP/IP, routing, NAT, firewalls, and traffic management

• Configure and support OpenVPN / WireGuard

• Work with iptables / nftables

• Administer and troubleshoot MikroTik

• Support PostgreSQL / MySQL, including backups, restores, users, and basic diagnostics

• Investigate incidents and perform Root Cause Analysis (RCA)

• Maintain technical documentation, runbooks, and knowledge bases

• Perform production changes carefully with change plans, backups/snapshots, and rollback procedures

• Automate routine tasks using Bash, Python, or Ansible

What we’re looking for

• 5+ years of Linux system administration experience

• Strong hands-on experience with Ubuntu / Debian / CentOS

• Confident with systemd, journalctl, dmesg

• Strong performance troubleshooting skills: OOM, CPU pressure, I/O wait, disk pressure, inodes

• Solid understanding of TCP/IP, routing, NAT, and firewalls

• Experience with OpenVPN or WireGuard

• Experience with iptables or nftables

• Hands-on experience with MikroTik

• Experience supporting PostgreSQL / MySQL, including backup and restore

• Understanding of production safety and change management

• Experience with RCA / problem management

• English sufficient for reading technical documentation

Nice to have

• Ansible

• Bash / Python scripting

• Nginx / HAProxy

• Experience with highload, crypto, fintech, payments, hosting, or telecom

Details

Schedule: shift-based

• 08:00–17:00

• 09:00–18:00

• 15:30–00:30

If you enjoy solving complex production incidents, digging into root causes, and keeping infrastructure stable and reliable in a crypto payments environment, we’d love to hear from you.

We are hiring for our partner — an international crypto payments company — and are looking for an IT Infrastructure / L3 Support Engineer to join an established infrastructure team.

You’ll work on a B2C product, supporting internal and production infrastructure across Linux, Windows, Microsoft 365, identity management, networks, databases, backups, and containers.

This is a hands-on L3 infrastructure role for a system administrator who enjoys solving technical issues across different areas rather than focusing on just one technology.

What you’ll do

• Administer Linux and Windows guest operating systems

• Provide L3 infrastructure support and troubleshoot complex technical issues

• Administer Microsoft 365 environments

• Manage Microsoft Entra ID / Azure AD

• Manage users, accounts, permissions, licenses, and corporate access

• Administer Slack and related integrations

• Manage domains and corporate working environments

• Support corporate networks and network security

• Work with pfSense / MikroTik

• Support databases and business applications

• Perform backup and restore operations

• Work with Docker / containers and basic automation

• Monitor infrastructure, investigate logs, and troubleshoot incidents

• Maintain technical documentation, task trackers, and knowledge bases

What we’re looking for

• 3+ years of experience in System Administration / IT Infrastructure

• Strong hands-on experience with Linux and Windows

• Practical experience with Microsoft 365 administration

• Experience with Microsoft Entra ID / Azure AD

• User, account, access, and permission management

• Good understanding of corporate networking

• Hands-on experience with pfSense or MikroTik

• Experience supporting databases, including backup and restore

• Experience with Docker or similar container technologies

• English sufficient for reading technical documentation

• Comfortable working in a shift-based schedule

• Strong attention to detail and ability to follow established processes

Nice to have

• Slack administration

• Entra ID ↔ Slack integrations

• Bash / Python scripting

• Ansible

• Experience in a B2C / product company

• Experience with task trackers and knowledge bases

• Nginx / HAProxy

Details

Schedule: shift-based

• 01:30–09:30

• 09:00–18:00

• 17:00–01:00

You’ll join an established team and work across a broad infrastructure stack, combining system administration, L3 troubleshooting, identity management, networking, and infrastructure support.

We’re looking for our first dedicated marketing person: hands-on, generalist, willing to learn fast. You’d be working directly with the founder (one person, no committee, no politics), running day-to-day marketing execution across our products (we’re shipping consumer apps on iOS and MacOS)

This is a full-time, remote role (35–40 hrs/week). Initial 3-month engagement with strong intent to extend if it’s working. Could grow into a Marketing Lead role as the portfolio scales.

What you’d actually do:
Your time will shift between our products based on what’s live, what’s launching, and what needs the most attention. Expect 2–4 products active in your queue at any time. Across them:

- Basic SMM. Run TikTok, Instagram accounts for our apps. Mostly base for launching ads and influencers outreach. We give you the playbook.
- Creator outreach. Find influencers of small and medium size (1K–10K, 10K-100K followers) in each product’s niche. Reach out, send brief, pay them, collect content, track results. Markets vary — often US, Europe, Brazil, Japan.
- Community participation. Genuine presence in the Reddit / Discord / Telegram communities relevant to each product. Help people, build credibility, mention the app only when it actually helps the conversation. We do NOT spam.
- Newsletter sponsorships . Find small targeted newsletters per product, negotiate small ads.
- Reporting & systems. Weekly metrics sheet across all products (downloads, ratings, install sources, MRR). Weekly Friday written report across all projects.

Who you are:
Ambitious junior or self-taught marketer. The role demands real ownership. You’ll get a budget, a playbook, and weekly priorities — then you decide what to ship and when. We don’t want someone who needs daily approval to do the next obvious thing.

Required:
- Strong written English
- Active TikTok user — you get how it works in 2026
- Comfortable on Pinterest, Reddit, Instagram at user level
- Comfortable juggling 2–4 different products with different audiences and brand voices, without mixing them up
- Spreadsheets (Google Sheets), comfortable in Notion or similar
- Self-directed: weekly plan, ship, iterate, raise blockers early
- Honest about what works and what doesn’t

Would be a plus:
- Efficient with AI
- Personal interest in consumer tech and design
- Basic Canva or Figma
- Previous experience juggling multiple small clients or projects in parallel
- Familiarity with App Store Connect or app analytics tools

Not required:
- A marketing degree
- Years of experience
- Agency background
- Knowing “ASO” or “CAC” — we’ll teach what you need

How we work:
- Async-first. Daily Slack/ check-in, weekly call.
- Weekly Friday written update across all projects.

We are looking for a Middle/ Middle+ PHP Developer to join a long-term project focused on building and evolving a complex data-processing platform in the Construction Technology domain.

This role is centered around backend architecture, high-load systems, and real-time data processing. You will be responsible for designing scalable services, managing asynchronous data flows, and ensuring reliable ingestion and processing of IoT device data.

The platform plays a key role in workforce tracking, operational efficiency, and automation of field processes. It processes large volumes of real-time data and applies complex business logic for workforce scheduling and analytics.

This is a backend-focused role with high ownership and impact on system architecture and performance.
 

Benefits

• Opportunity to solve complex architectural and high-load challenges
• Professional growth within a scaling tech company
• High-impact role in a real-world IoT and data-driven product
• Work with modern backend technologies and distributed systems
• Remote-first environment with flexibility and autonomy
   

About the Client

International product company in the Construction Technology domain, focused on automating workforce management processes through IoT and cloud-based solutions.

The product replaces manual time tracking with automated data collection, improves payroll accuracy, and enables real-time tracking of workforce operations and analytics.
 

About the Project

The platform’s core processing system is responsible for IoT data ingestion, real-time processing, and advanced workforce scheduling logic.

The system provides real-time dashboards and analytics for operational decision-making.
 

Location: United States

Duration: long-term
 

Requirements

• 3+ years of commercial experience with PHP in backend development
• Strong expertise in Laravel and its ecosystem in production environments
• Deep knowledge of PostgreSQL, including optimization, indexing, and schema design
• Experience with Laravel Jobs and queue systems (Redis, SQS)
• Solid understanding of RESTful APIs and third-party integrations
• Experience with Eloquent ORM performance tuning and N+1 query prevention
• Familiarity with Docker and containerized development
   

Additional Requirements

• Strong understanding of SOLID principles and clean code practices
• Strong problem-solving skills and attention to detail
• Experience working in Agile/Scrum environments
• Upper-Intermediate (B2+) English level for spoken communication
   

Responsibilities

• Design and implement scalable backend services and APIs
• Architect and evolve backend systems for high-load environments
• Optimize complex database queries to handle large volumes of real-time data
• Build and manage asynchronous processing using queues and background jobs
• Ensure reliable ingestion and processing of IoT-driven data streams
• Conduct code reviews and maintain high standards of code quality
• Refactor legacy components into modern, maintainable service patterns
• Collaborate with product and engineering teams to translate business requirements into technical solutions
   

🇺🇦 Additional Notes

• We consider candidates both in Ukraine and abroad
• For specialists based in Ukraine, we provide the option of official booking (reservation)

We’re Hiring: Customer Support Manager

Our mission: to deliver world-class gaming experiences by providing fast, reliable, and customer-centric support that builds trust, satisfaction, and long-term loyalty. We are looking for a Customer Support Manager to manage our support daily operations and ensure an outstanding experience for every player.

Now we are looking for Customer Support manager, who will cover 3PM-11PM shifts by London time

What You’ll Do:

• Deliver high-quality, timely, and professional assistance across all communication channels, including some of cold, reactivation or  up-sell outbound outreaches (live chat, email, etc.);
• Ensure hitting personal KPIs (list of KPIs) and continuous improvement;
• Participate in developing and optimizing support processes, workflows, and internal knowledge bases to increase efficiency and service quality;
• Handle complex escalations and ensure that critical cases are resolved quickly and in line with company standards;
• Gather and analyze customer feedback and support data to identify trends, pain points, and opportunities for product and service improvements;
• Ensure compliance with regulatory requirements and internal policies in all customer communications.
  
   

What We’re Looking For:

• Proven experience in Customer Support management within the iGaming, gambling, or similar fast-paced digital industries;
• High level of autonomy in resolving customer requests or going through a proper escalation process;
• Deep understanding of customer service KPIs, quality assurance processes, and performance management.
• Data-driven mindset with the ability to identify trends and turn them into improvement suggestions.;
• Excellent communication skills and a customer-first approach, + fast typing and proficient PC / Internet user;
• Ability to manage multiple priorities, adapt quickly to change, and stay solution-oriented under pressure.
  
   

Experience:

• 1+ years of experience in Customer Support. 
• English B2+ level.
  
   

Why You Should Join Us:

• Competitive Compensation: Enjoy a competitive salary and performance-based bonuses.
• Remote Flexibility: Work from anywhere as part of an international and geographically diverse team.
• Professional Growth: We invest in your career development with learning opportunities and clear growth paths.
• Exciting Challenges: Join a fast-growing company at the forefront of the iGaming industry.

Apply now and help us elevate the player experience, build a world-class support function, and make a lasting impact in the iGaming world.

We are looking for a Lead DevOps / Observability Engineer to lead the migration of the client's observability stack from New Relic and Datadog to Grafana, using technologies such as Prometheus, Loki, and Tempo.

This is a hands-on role combining:
- DevOps & platform engineering - deploying and configuring the new observability stack using AWS, Kubernetes, and Terraform.
- Application instrumentation - modifying application code to add or adapt metrics, logs, and traces.
- Migration & collaboration - rebuilding existing dashboards and alerts in Grafana and working with multiple engineering teams to ensure full monitoring coverage.

We are looking for someone who is comfortable working across both infrastructure and application code and can independently drive a cross-team observability migration.

Responsibilities:

• Lead the migration of monitoring, alerting, and dashboards from New Relic and Datadog to Grafana.
• Design and implement the target observability architecture (metrics, logs, traces) and the infrastructure-as-code (Terraform) needed to support it.
• Audit existing New Relic and Datadog dashboards, alerts, and integrations to build a complete migration inventory and ensure feature/coverage parity in Grafana.
• Make application-level code changes across services to add, adjust, or replace instrumentation (metrics exporters, logging, tracing libraries) as needed for the new stack.
• Work with AWS infrastructure, including EKS, Kubernetes, and Docker, to deploy and operate the new observability tooling.
• Configure AWS networking and access as needed to support the observability platform (VPCs, security groups, IAM).
• Contribute to CI/CD pipelines and deployment automation using GitHub Actions to support the rollout.
• Collaborate with development, platform, and infrastructure teams to coordinate the cutover from New Relic/Datadog to Grafana with minimal disruption.
• Identify and remediate any security issues (secrets, keys, dependencies) encountered in the course of this work.
• Document the new observability architecture, migration procedures, and dashboard/alert mappings.
• Use AI-assisted development tools, including Codex, to improve engineering productivity and delivery speed.

Requirements: 

• Strong hands-on experience with Grafana, including dashboard design, alerting, and data source configuration (e.g. Prometheus, Loki, Tempo, or similar).
• Practical experience migrating away from commercial observability platforms such as New Relic and/or Datadog.
• Full-stack development experience — comfortable reading, modifying, and instrumenting application code across front-end and back-end services, not just infrastructure.
• Solid experience with AWS in production environments, including EKS and Kubernetes.
• Practical experience with Docker and containerized workloads.
• Strong Terraform and infrastructure-as-code skills.
• Experience with GitHub Actions or comparable CI/CD tools.
• Ability to work across multiple teams, services, and codebases to coordinate a cross-cutting migration.
• Fluency with Codex or comparable AI-assisted coding tools.

Nica to have:

• Prior experience running a similar New Relic/Datadog-to-Grafana (or equivalent) observability migration end to end.
• Grafana-specific certifications or demonstrated community contributions (plugins, dashboards, etc.).
• Experience with the broader Prometheus/Loki/Tempo (LGTM) ecosystem.
• AWS certification, such as AWS Solutions Architect Associate/Professional.
• Experience with RDS and other AWS data services.
• Prior contract or consulting experience with clearly defined deliverables.
• At least an Upper-Intermediate level of English 

Join a growing DevOps community at Sigma Software and build hands-on experience with modern cloud infrastructure, CI/CD pipelines, automation, and Infrastructure as Code. We are looking for a Junior DevOps Engineer eager to develop technical expertise while working alongside experienced professionals on international projects.

You will become part of a top-notch DevOps team of more than 30 specialists collaborating across cloud-native platforms, enterprise systems, and scalable digital products. We as a company support continuous learning, mentoring, certification growth, and transparent career development.

This role is a great opportunity for engineers who want to strengthen their cloud and automation skills in a collaborative environment with access to Senior and Principal-level mentorship.

Requirements

• 1+ years of hands-on experience with at least one public cloud platform: AWS, Azure, or GCP
• Solid understanding of Linux administration and networking fundamentals including TCP/IP, DNS, HTTP/HTTPS, services, packages, and system metrics
• Understanding of CI/CD principles and practical exposure to GitHub Actions, GitLab CI, Azure DevOps, Jenkins, or TeamCity
• Understanding of containerization concepts and practical experience with container images and runtime environments
• Scripting experience using Shell and either Python or PowerShell
• General understanding of Infrastructure as Code and configuration management tools such as Terraform and Ansible
• Understanding of SDLC processes and DevOps principles
• Basic knowledge of databases, monitoring, logging, backup, storage, and security concepts
• Understanding of authentication and authorization concepts, TLS, and secure secrets management
• Experience using AI assistants responsibly while validating outputs and maintaining data security standards
• Good communication and collaboration skills
• At least an Upper-Intermediate level of English

WILL BE A PLUS:

• Experience with Kubernetes or other orchestration platforms
• Hands-on experience with Terraform or Ansible in production environments
• Experience with centralized logging and monitoring tools such as Prometheus, Grafana, ELK Stack, CloudWatch, or Datadog
• Exposure to GitOps practices
• Familiarity with AI/LLM services or vector databases in infrastructure-related scenarios
• Cloud or Linux-related certifications

Personal Profile

• Strong willingness to learn and grow within a professional DevOps environment
• Proactive and ownership-oriented mindset
• Ability to collaborate effectively in cross-functional teams
• Attention to detail and structured approach to operational tasks
• Good analytical and problem-solving skills

Responsibilities

• Set up, configure, test, and maintain infrastructure across development, staging, testing, and production environments
• Contribute to Infrastructure as Code implementation following established modules, conventions, and review processes
• Support CI/CD pipeline configuration, maintenance, release preparation, and deployment activities
• Investigate incidents by collecting logs and monitoring evidence, performing initial triage, and documenting resolutions
• Configure monitoring checks, alerts, and participate in backup and recovery procedures
• Follow security best practices including least-privilege access management and secure secrets handling
• Maintain infrastructure documentation, deployment instructions, architecture diagrams, and operational runbooks
• Collaborate with developers, QA engineers, security specialists, and operations teams
• Continuously improve technical skills through mentoring, certifications, and project participation

Lead Engineer | Node.js, React Native, AI Agents

Location: London / hybrid preferred, or remote from Central & Eastern Europe
Level: Mid-to-Senior, hands-on Lead
Employment: Full-time, permanent

About the company

We are an early-stage UK product company building an AI-powered platform focused on professional relationships and network intelligence.

The product combines a social graph, relationship data and an AI agent that helps users identify relevant people, understand their network and strengthen important connections.

We are looking for a Lead Engineer / Founding Senior Engineer who will own the technical architecture, write production code and help grow the engineering team.

This is a hands-on engineering role, not a pure management position.

Tech stack

• Node.js / TypeScript / Express
• React Native + Expo
• MongoDB Atlas
• Atlas Vector Search + BM25 / hybrid retrieval
• OpenAI / custom LLM tool-calling agents
• AWS EC2, Cognito, S3
• Docker, Nginx
• GitHub Actions / CI/CD

Responsibilities

• Own technical architecture and production infrastructure
• Ship features across backend, mobile and AI agent layers
• Build and improve LLM agents, prompts, tool-calling flows and evaluation
• Mentor engineers and establish strong engineering practices
• Implement privacy-by-design and GDPR requirements
• Build and use synthetic data for development, testing and model evaluation
• Own CI/CD, monitoring, secrets management and incident response
• Own application and infrastructure security
• Secure AI agents against prompt injection, data leakage and unintended tool actions
• Work directly with the Founder on product and architecture decisions

Must-have

• 4+ years of professional software engineering experience
• Strong Node.js / TypeScript backend experience
• Experience owning real production systems
• Comfortable across backend, frontend/mobile and infrastructure
• MongoDB or similar document database experience
• Hands-on experience building LLM agents and prompting systems
• Experience with agent tool usage and evaluation
• Practical GDPR and data privacy knowledge
• Strong security fundamentals
• Understanding of AI-agent risks such as prompt injection, data leakage and unintended actions
• Experience working with synthetic data
• Production deployment, monitoring and incident-response experience
• Previous mentoring or technical leadership experience
• Comfortable with ambiguity and a fast-moving startup environment

Nice-to-have

• React Native / Expo
• RAG / vector search
• AWS Cognito
• Previous Tech Lead, CTO or founding engineer experience
• Application security / pentesting background
• Experience securing LLM / AI-agent applications

Compensation

Competitive salary + equity depending on experience and location.

We are looking for someone interested in a long-term role and growing together with the company, not a freelance or short-term contract position.

We are looking for a strong Backend Developer for a high-load project connected with Android infrastructure, reverse engineering, network traffic analysis, and processing large amounts of data.

The main backend is built on Node.js, so strong knowledge of JavaScript and TypeScript is required.

Responsibilities

• Develop and maintain backend services using Node.js / TypeScript.
• Work with high-load and distributed systems.
• Design systems for storing and processing large amounts of data.
• Work with PostgreSQL, ClickHouse, and Redis.
• Optimize database queries, indexes, and data structure.
• Work with:
  • replication;
  • sharding;
  • partitioning;
  • distributed data;
  • high availability;
  • fault tolerance.
• Work with Kubernetes infrastructure.
• Find and fix performance problems in backend, databases, and infrastructure.
• Analyze network traffic and application communication.
• Work with traffic sniffing and proxy tools.
• Understand how mobile applications communicate with backend services and APIs.
• Analyze requests, responses, headers, payloads, tokens, and sessions.
• Work with existing code and systems with limited documentation.
• Find technical problems and propose solutions independently.
• Work with distributed workers, services, and nodes.

Required Skills

Backend

• Strong experience with Node.js.
• Strong knowledge of JavaScript.
• Strong knowledge of TypeScript.
• Good understanding of async programming.
• Understanding of Node.js event loop.
• Experience with REST API and WebSocket.
• Experience with high-load backend systems.

Databases

• Strong experience with PostgreSQL.
• Strong experience with ClickHouse.
• Strong experience with Redis.
• Good understanding of:
  • indexes;
  • query optimization;
  • query plans;
  • replication;
  • sharding;
  • partitioning;
  • distributed databases;
  • data consistency;
  • high availability.

Experience with large databases and high traffic is very important.

Infrastructure

• Kubernetes.
• Docker.
• Linux.
• Experience with cluster systems.
• Understanding of networking.
• Understanding of load balancing.
• Understanding of horizontal scaling.
• Ability to find CPU, RAM, disk, and network bottlenecks.
• Experience with logs and monitoring.

Reverse Engineering / Network Analysis

• Understanding of Android reverse engineering.
• Understanding of Android architecture.
• Experience with traffic sniffing.
• Good understanding of HTTP / HTTPS.
• Understanding of TLS.
• Experience with proxy-based traffic analysis.
• Understanding of authentication, sessions, cookies, and tokens.

Important

We are not looking for a developer who only has experience with simple CRUD applications.

The candidate should understand the full system:

application → network → backend → databases → infrastructure

The developer should be able to work independently, research technical problems, understand existing systems, and find solutions even when documentation is limited.

Level

Strong Middle / Senior Backend Developer

Experience in these areas will be a plus:

• high-load systems;
• distributed systems;
• reverse engineering;
• network traffic analysis;
• large-scale data processing;
• complex or undocumented APIs;
• systems with many workers and nodes.

The Defense Procurement Agency (DOT) is a national agency responsible for procuring ammunition, UAVs, military equipment, fuel, food, clothing, and other critical supplies for the Armed Forces of Ukraine and the Defense Forces.

Our mission: Strengthening Ukraine by ensuring reliable support for the Defense Forces while fostering the development of the national defense industry.

Our vision: To become the driving force behind the transformation of Ukraine's defense procurement ecosystem—not only operating the system, but continuously improving it.

We are looking for a Tech Lead / Senior DevSecOps to provide technical leadership to the Security Engineering team, develop information security architecture, implement security solutions across the Microsoft ecosystem, and integrate security requirements into infrastructure and software development processes.

Responsibilities

• Provide technical leadership to the Security Engineering team, including prioritizing and distributing tasks, mentoring team members, and ensuring the quality of implementation.
• Design and develop information security architecture and key cybersecurity capabilities, including Cloud Security, Identity & Access Management, Vulnerability Management, DevSecOps, and Incident Response.
• Implement, administer, and develop security services across the Microsoft security ecosystem.
• Conduct security reviews of infrastructure, CI/CD pipelines, and Infrastructure as Code (Terraform).
• Collaborate with Infrastructure, DevOps, and Software Engineering teams to integrate security requirements into architecture and development processes.
• Develop the AI Security function, including AI Security Proxy, AI Governance, DLP, monitoring, and auditing.
• Develop technical security standards, guidelines, recommendations, and information security documentation.

Requirements

• Bachelor's or Master's degree in Cybersecurity, Information Technology, Computer Science, or a related field.
• 3+ years of experience in cybersecurity roles such as Security Engineer, Cloud Security Engineer, or DevSecOps Engineer, with hands-on experience in Azure Security and Microsoft Security.
• Hands-on experience securing cloud infrastructure in Microsoft Azure.
• Strong knowledge of Microsoft security services, including Defender XDR, Defender for Cloud, Sentinel, Intune, Entra ID, Purview, and related solutions.
• Experience building and developing Vulnerability Management processes.
• Strong understanding of modern DevSecOps practices, including CI/CD security, Infrastructure as Code (Terraform), SAST, DAST, Secret Scanning, and IaC Security.
• Hands-on experience securing containerized environments and Kubernetes.
• Experience with information security incident analysis and response.
• Previous technical leadership experience or strong Senior Security Engineer experience with the readiness to take on a Tech Lead role.

What We Offer

• Meaningful work that directly contributes to strengthening Ukraine's defense capabilities.
• Official employment with competitive salary and full social benefits.
• Professional development, learning opportunities, and career growth.
• Structured onboarding and dedicated mentorship.
• A collaborative, supportive, and mission-driven team.
• Modern office near the metro with reliable internet and equipped shelter.

By joining our team, you will contribute to one of Ukraine's largest digital transformation initiatives in the defense sector and help build the future of defense procurement.

Ready to make a real impact? We'd love to hear from you. Apply today!

* By submitting your CV, you consent to the processing of your personal data in accordance with applicable legislation.

** Due to the high volume of applications, only candidates whose qualifications best match the position will be contacted.

About the Client

Our client is a leading global healthcare organization, driving innovation in pharmaceuticals, biotechnology, and patient-centric solutions.

We develop advanced data and analytics solutions that help global organizations turn complex data into intuitive digital tools, enabling teams to make informed decisions in their daily operations and long-term strategy. Our projects span modern operational applications, interactive dashboards, and advanced analytics platforms designed to deliver actionable insights across multiple business domains.

About the Role

We are looking for a proactive and analytical Market Research Analyst to support strategic decision-making in the aesthetics medicine industry, with a focus on the Facial Injectables market.

The role involves conducting market, industry, competitor, financial, digital, and brand research, identifying relevant trends and opportunities, and translating research findings into clear, actionable insights for senior and executive leadership.

The successful candidate will work with both quantitative and qualitative information, research companies and markets using multiple sources, identify meaningful patterns and business implications, and communicate findings through structured analyses and executive-level presentations. The scope of the role may evolve depending on business priorities and emerging research needs.

Key Responsibilities

• Conduct market, industry, competitor, and company research to support strategic decision-making.
• Monitor competitor activities, product developments, strategic initiatives, geographic expansion, investments, and other relevant market developments.
• Analyze company financial performance, including revenue dynamics, business segments, margins, cost structure, and profitability drivers.
• Research competitor digital presence, brand positioning, messaging, PR strategies, product focus, and audience engagement across relevant channels.
• Monitor industry trends, emerging players, high-growth segments, industry events, and other market signals to identify risks and opportunities.
• Synthesize information from multiple sources into clear, actionable business and strategic insights.
• Prepare PowerPoint presentations and executive-level reports communicating key findings, trends, implications, and recommendations.
• Use existing Power BI dashboards and other analytical tools to support research and analysis.
• Maintain structured research materials, trackers, datasets, and research libraries.
• Conduct ad hoc research and analysis and support other market research initiatives as business priorities evolve.
• Organize all collected intelligence into a document library for future AI ingestion.
• Proactively suggest improvements to research methodologies, data sources, and analytical processes.

Required Skills & Experience

• 4+ years of experience in market research ( competitive intelligence, business analysis, strategy, consulting, or a related analytical role).
• Relevant experience in pharmaceuticals, medical devices, aesthetics medicine, healthcare, or a closely related industry is required.
• Proven experience conducting market, industry, company, or competitor research and analyzing both quantitative and qualitative information.
• Experience analyzing financial performance, business models, market dynamics, or similar business metrics.
• Strong PowerPoint and Excel skills.
• Ability to independently structure research, identify relevant and reliable sources, and synthesize findings into clear business insights.
• Excellent written and spoken English.
• Strong attention to detail, organization, and accuracy.
• Proactive and self-motivated, with the ability to work independently and communicate findings clearly to senior stakeholders.

Nice to have

• Experience with Power BI or other data visualization tools
• Experience analyzing digital and social media presence, brand positioning, or PR strategies.
• Experience preparing presentations and reports for senior or executive leadershi

Looking to take your .NET expertise to the next level while working on high-impact FinTech solutions? This role offers the chance to contribute to scalable, cloud-native systems that empower thousands of businesses worldwide.
We’re seeking a Senior .NET Developer to join our team, collaborating with talented engineers, product managers, and designers to deliver innovative financial technology.
At Sigma Software, we work with some of the most forward-thinking companies in the industry. This opportunity will let you grow professionally while making a tangible difference in a fast-paced, regulated environment.

CUSTOMER

Our customer is a leading FinTech company providing embedded financing solutions for platforms and marketplaces. Their mission is to enable businesses to offer flexible credit products to customers, helping SMEs access funding quickly and efficiently.
The customer is recognized for innovation in embedded finance, serving thousands of businesses globally and partnering with major platforms. They operate in a regulated environment with a strong focus on scalability, performance, and security.

PROJECT

The project involves enhancing and expanding customer’s embedded finance platform, which integrates directly into partner services to deliver fast, flexible funding to SMEs. You’ll work on a modern tech stack, building features that improve customer and partner experiences while ensuring reliability in production.
Key Technologies: C#, .NET Core, Angular 18, AWS, CI/CD, Docker/Kubernetes, Kafka/RabbitMQ, Datadog, relational & NoSQL databases

Job Description

• Design, build, and deliver features and projects across C#, .NET Core, and Angular stack
• Write clean, maintainable, and well-tested code (unit/integration/e2e)
• Take ownership of features from requirements breakdown to deployment
• Deploy and monitor services in AWS cloud-native environments
• Handle production issues and incidents with accountability
• Collaborate with Product, Design, and Engineering teams in Agile practices
• Contribute to continuous improvement of systems and processes

Qualifications

• 5+ years of experience in software development with strong OOP and system design skills
• Solid hands-on experience with .NET (C#) and Angular
• Understanding of software testing concepts and practices
• Expertise in cloud-native and DevOps practices (CI/CD, automation, monitoring)
• Experience with relational and NoSQL databases
• Knowledge of non-functional requirements (performance, security, availability)
• Proven experience in FinTech, payments, banking, or regulated financial environments
• Upper-Intermediate English level or higher

WILL BE A PLUS

• Experience with Docker/Kubernetes
• Familiarity with event-driven architectures (Kafka, RabbitMQ)
• Proficiency with observability tools (Datadog or similar)
• Knowledge of domain-driven design (DDD) and complex domain modeling

PERSONAL PROFILE

• Growth mindset, curiosity, and proactivity
• Strong problem-solving skills balancing complexity and simplicity
• Feedback-oriented, open to giving and receiving constructive input
• Ownership & accountability in delivering commitments
• Team player with strong collaboration skills
• Adaptability to changing priorities
• Excellent communication skills across disciplines