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Senior Application Security Engineer

Unlimit

Belgradesenior

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Role description

About Unlimit
Unlimit is a global fintech ecosystem built to eliminate financial borders holding businesses back. The company provides the extensive infrastructure needed to scale globally, integrating payment processing, multi-currency business accounts, BaaS and crypto gateways into a single, intelligent platform.

Across 17 offices globally, Unlimit bridges hyper-local expertise with a high-capacity financial network, giving companies the agility to expand across regions with operational confidence and speed. Driving the evolution of payments, Unlimit is transforming its infrastructure from human-operated fintech into AI-native financial infrastructure — where APIs are consumed by machines, integrations are negotiated by agents, and systems evolve continuously through intelligent automation. Our next users are not only humans. They are AI agents acting on behalf of humans and businesses.

Unlimit serves more than the needs of businesses today; we are building the nervous system for a borderless global economy.

Your Challenge
As a Senior Application Security Engineer, you’ll be a hands-on technical expert responsible for improving the security of Unlimit’s applications, APIs, and development processes. You’ll help engineering teams identify and remediate security risks early, automate security testing, and integrate security seamlessly into modern CI/CD pipelines.

This role is ideal for someone who combines strong software engineering fundamentals with practical offensive security knowledge and enjoys building scalable, developer-friendly security solutions through automation and AI.

What You’ll Do
Drive secure software development practices across the organisation.

Perform application security assessments, secure design reviews, and threat modelling for new and existing products.

Conduct manual source code reviews for business-critical applications and support remediation of complex security issues.

Integrate and optimise security testing throughout the SDLC, including SAST, DAST, Software Composition Analysis (SCA), API security testing, and Infrastructure as Code (IaC) security.

Build and improve automated application security workflows within GitLab CI/CD pipelines.

Own and continuously improve Application Security Posture Management (ASPM) capabilities.

Partner closely with software engineering teams to identify vulnerabilities early and implement practical, scalable security controls.

Support penetration testing activities by coordinating external assessments, validating findings, and driving remediation.

Contribute to the development of internal AI-powered and agentic application security workflows, including automated security reviews, code analysis, and vulnerability triage.

Research emerging attack techniques and translate them into practical improvements across secure development and security testing.

Develop security guidance, reusable patterns, and engineering standards that enable developers to build secure software at scale.

What We’re Looking For
5+ years of experience in Application Security, Software Security, DevSecOps, or Software Engineering with a strong security focus.

Previous experience in fintech is preferred; experience in cryptocurrency is a strong plus.

Strong software development background with hands-on experience across modern application architectures.

Experience performing threat modelling, secure design reviews, and manual code reviews.

Strong understanding of Secure SDLC principles and practical application security engineering.

Experience implementing and maintaining automated security testing within CI/CD pipelines.

Hands-on experience with SAST, DAST, SCA, API security testing, ASPM, and modern application security tooling.

Practical understanding of modern attack techniques, exploitation methods, and secure coding practices.

Experience collaborating directly with engineering teams to remediate vulnerabilities and improve application resilience.

Strong scripting or programming skills in one or more of the following: Java, Go, Python, Node.js, PHP, or Dart (Flutter).

Experience working with GitLab-based development workflows.

A pragmatic, engineering-first mindset with a passion for automation and AI-assisted security.

Nice to Have
Practical penetration testing experience or an offensive security background.

Bug bounty participation or responsible vulnerability disclosure experience.

OSCP, OSWE, or similar offensive security certifications.

Experience with application or software architecture, including secure architecture design and security patterns.

Experience developing AI-powered or agentic security automation.

Contributions to open-source security projects, security research, or technical community initiatives.

Join Unlimit Team now!
Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

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SRE

Senior Java Software Engineer

Paychex

Belgrade

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Role description

Paychex is reimagining how businesses manage their workforce by bringing payroll, HR, benefits, and advisory services together into a single connected HCM platform. As Paychex and Paycor come together, we're combining innovative technology, data-driven insights, AI, and human expertise to help organizations work smarter, support their people, and achieve better business outcomes. This is an exciting time to join our team as we continue to invest in innovation, simplify client experiences, and shape the future of work. At Paychex, you'll have the opportunity to grow your career, make a meaningful impact, and be part of something bigger as One Paychex.

Responsibilities

  • Provide support for the billing system, including resolution of production incidents and implementation of application change requests
  • Develop, test, deploy, maintain, and enhance software to meet requirements
  • Design and develop test automation code
  • Perform comprehensive analysis and design for broadly defined requirements
  • Contribute to technical direction and software architecture decisions
  • Provide technical support and troubleshooting for applications across environments, including high-impact production issues
  • Support changes during quality assurance, user acceptance testing, and post-implementation activities
  • Leverage AI development tools and support agentic development.
  • Support agentic development and improve productivity

Qualifications

  • Bachelor's degree in a computer-related discipline or equivalent work experience
  • 5+ years of hands-on Java development experience
  • Experience building and supporting APIs and RESTful microservices
  • Experience with relational and NoSQL databases
  • Experience with Kafka and enterprise data pipelines
  • Experience supporting and troubleshooting production applications in Agile environments
  • Familiarity with AI development tools for agentic development

What's in it for you?

  • A flexible work philosophy
  • Company paid private health insurance
  • Company paid life and disability insurance
  • Paid leave for illness, birth parents, non-birth parents, elder caregivers, marriage, adoption of a child and bereavement
  • Inclusive and accessible Employee Assistance Program (EAP) to help with everyday challenges
  • Christmas and Easter bonuses
  • Opportunity for strengthening expertise and skills through Paychex’s learning platform, including lessons in English

Not sure if you meet every requirement?
At Paychex, we know that great talent comes in many forms. If you're passionate about the role but don't check every box, we still encourage you to apply. You might be the right fit - either for this position or another opportunity with us.

Paychex is an equal opportunity employer. We are committed to fostering a respectful and inclusive workplace where all individuals are treated fairly and evaluated based on their qualifications, experience, and merit. We comply with all applicable federal, state, and local laws prohibiting discrimination in employment.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

SRE

IT Support Engineer L2

Fundraise Up

Belgrade

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Role description

Highlights:

  • Location: Serbia
  • Languages: Fluent in Russian and English
  • Working hours: 14:00 - 23:00 CET

About Fundraise Up
We’re Fundraise Up - a global fundraising platform built to make donating to nonprofits fast, seamless, and accessible to all. Every month, our technology powers tens of millions of dollars in donations across the globe. We focus on innovation that directly impacts results: faster load times, higher conversion rates, global payment support, and accessibility-first design.

Our platform is trusted by many of the world’s leading nonprofits, including UNICEF, the Alzheimer’s Association, and a wide range of global NGOs. With a 4.9/5 rating across top software review platforms, we’re recognized not just for our impact - but for the quality of the product we deliver.

A Truly Global Product
We operate in the enterprise segment, serving nonprofit organizations across North America, the United Kingdom, Australia, and Europe.

We’re building a
large and complex product ecosystem
that serves nonprofits, donors, and partners around the world. The platform includes a modern
checkout experience and customizable widgets
(each a standalone SPA),
donor, organization, and partner portals
,
admin tools
, and several internal apps.

The Team
We are a distributed team of 160+ product professionals. Our team members are mainly based across Spain, Poland, Portugal, Georgia, Armenia, Serbia, Turkey, and Cyprus.

Despite our scale, we operate like a focused team - where every task matters and every voice is heard. We value thoughtful collaboration, strong engineering practices, and a product mindset. You’ll be joining a team where quality, mentorship, and mutual respect come first.

About The Role
We are looking for a proactive and security-minded
IT Support Engineer (L2)
to join our global team. As a core member of our L2 team, you will share responsibility for complex technical escalations across time zones. Beyond operational support, you will take
full ownership of Access Governance and SaaS administration
. We are looking for an engineer who doesn't just follow processes but actively seeks to automate them, improving our efficiency and security posture through continuous integration and smart tooling.

What You’ll Do

  • L1 escalations: intake, triage, diagnosis, and resolution of tickets not closed at L1. Includes admin operations in corporate tools, access provisioning, complex technical requests, integrations, and alerts from monitoring systems. Work within agreed SLAs for response and resolution; escalate further when outside scope or ownership boundaries.
  • Onboarding & offboarding support: creation and deprovisioning of accounts in corporate SaaS tools, MDM enrollment where applicable, credential handoff, and baseline laptop setup in line with internal processes.
  • Incident response: phishing, account compromise, lost/stolen devices, malware, and other security alerts — containment, remediation, and follow-up actions using documented playbooks.
  • Automation & integrations: drive continuous improvement through scripts, APIs, Zapier/n8n (or equivalents), and integrations to eliminate repetitive manual work. Automation does not have to be your current strongest skill, but initiative and genuine interest are required. You can consult with our Tools Engineer, but ideas and ownership should come from you.
  • L1 mentoring & documentation: provide regular feedback and coaching, maintain and improve L1 instructions and runbooks, and document automations and recurring operational procedures.
  • Corporate SaaS administration: admin ownership over our core collaboration and identity stack (e.g., Slack, Notion, Google Workspace, 1Password) plus other corporate SaaS tools — configuration, access policies, audits, and license usage control.
  • SaaS lifecycle management: maintain the SaaS registry in Notion, provide reporting for Vendor Management ahead of renewals; evaluate new tools and roll out after approval; decommission outdated tools.
  • Identity-related incident playbooks: develop and maintain playbooks for phishing, account compromise, suspicious sign-ins in Google Workspace, and credential/access rotation.
  • At Fundraise Up, AI is a default tool, not an experimental one. We expect every team member to actively use AI in their day-to-day work, identify where AI can change the shape of problems in their function, and grow their fluency as the tools evolve. You should already be using AI meaningfully in your work and understand where it adds value and how it can improve the way you operate.

Requirements

  • 5 years in IT support, with at least 3–5 years at L2 / Sysadmin level.
  • Strong troubleshooting skills and end-to-end ticket ownership (intake, triage, resolution, escalation when out of scope).
  • Hands-on experience with macOS administration and end-user troubleshooting.
  • Strong Google Workspace admin skills (roles, logs, security settings).
  • Understanding of security and incident handling (phishing / account compromise).
  • Comfortable with identity & access work (RBAC, audits, access reviews; understands how SSO / SAML / SCIM affect onboarding/offboarding).
  • Ability to write and keep documentation up to date (runbooks, checklists, incident playbooks); can mentor L1.

Strong plus

  • Admin ownership in multiple corporate SaaS tools (e.g., Slack/Notion + project management + ticketing/support tooling) — access policies, audits, license management
  • Automation experience (scripts / APIs / Zapier / n8n or equivalents). We can support your growth here, but you should be self-driven and eager to automate your own work.
  • Knowledge of 1Password or similar in a corporate context (if not covered above as a must-have)
  • Experience with Jira Service Management (as a user or admin) or similar tools
  • Familiarity with vendor/license management processes (renewals, usage reporting)
  • Experience with MDM / endpoint tooling (for collaboration with Devices & Infrastructure owner)

Why work with us

  • A strong, collaborative product team that owns what it builds
  • Clear product vision and access to real customer feedback from global nonprofit leaders
  • Flat structure: no politics, just great work with great people
  • Transparent company culture-we share how we’re growing, where revenue comes from, and what’s next
  • Long-term focus: we offer equity options and value sustained, meaningful contribution

Benefits

  • Private medical insurance for the employee and their family
  • 20 paid vacation days per year
  • 15 paid public holidays per year
  • 5 company-paid sick leave days
  • English learning courses
  • Relevant professional education
  • Gym or swimming pool
  • Home Office Setup Assistance: the company offers assistance with purchasing furniture (office chair, office desk, monitor) and other items to create a comfortable workspace
  • Co-working
  • Remote working

We are an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, gender, sexual orientation, gender identity or expression, age, national origin, disability, or any other characteristic protected by applicable law in the countries where we operate.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

SRE

Application Support and Technical Analyst

Manpower Serbia

Belgrade

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Role description

On behalf of our client, an international company specializing in the trading and distribution of raw materials, metals, and industrial materials, Manpower Serbia is looking for a motivated and experienced professional to join their team as an
Application Support & Technical Analyst.

  • As an
    Application Support & Technical Analyst
    , you will be responsible for the day-to-day support, reliability, and continuous improvement of the company’s Commodity Trading and Risk Management (CTRM) system and related applications.

  • The role combines technical application support, troubleshooting, system administration, testing, and collaboration with business users. You will work closely with internal users, technical teams, and external development partners to ensure that critical applications and business processes operate smoothly and efficiently.

Description

  • Monitor the health, availability, and performance of business-critical applications and scheduled processes.
  • Troubleshoot application, data, integration, and workflow issues and coordinate their resolution.
  • Investigate incidents, identify root causes, and implement or coordinate corrective and preventive actions.
  • Provide technical support to internal users across Trading, Operations, Finance, Risk, and Accounting.
  • Administer users, permissions, reference data, and other application configurations.
  • Work closely with developers and external vendors on incidents, system changes, enhancements, and releases.
  • Create and execute test cases, support User Acceptance Testing (UAT), and validate system changes before and after releases.
  • Support projects related to reporting, automation, integrations, data quality, and process improvement.
  • Identify opportunities to automate manual and repetitive activities and improve operational processes.
  • Maintain documentation, procedures, and user guides and contribute to improving support processes.

Requirements

  • Bachelor’s degree in information systems, Computer Science, Engineering, Business, Finance, or a related field.
  • 3+ years of relevant experience in application support, technical analysis, business systems analysis, production operations, or a similar role.
  • Strong experience supporting business-critical applications and troubleshooting issues across systems, data, integrations, and automated processes.
  • Good understanding of Python is required, with the ability to read and understand existing scripts. This is not a software development role, so advanced programming experience is not required.
  • Practical knowledge of SQL, databases, APIs, and scripting.
  • Understanding of application logs, scheduled jobs, file transfers, integrations, and basic infrastructure concepts.
  • Experience working with software developers, vendors, and business stakeholders.
  • Strong analytical and problem-solving skills, ownership, and the ability to work independently during time-sensitive incidents.
  • Excellent English communication skills and the ability to explain technical topics clearly to non-technical users.

The following would be considered an advantage:

  • Experience with CTRM/ETRM platforms or commodities-related businesses.
  • Understanding of trading, pricing, logistics, inventory, invoicing, settlements, PnL, risk, or accounting processes.
  • Experience with Azure/AWS, Power BI, Tableau, or similar tools.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

SRE

Senior Infrastructure Specialist

Deloitte

Belgradesenior

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Role description

Description & Requirements
Who we are looking for
As
Senior Infrastructure Specialist
you work across all layers of IT to ensure new solutions, IT assets and services are introduced sustainably and securely - thereby driving the delivery of IT infrastructure for our businesses.

  • Degree in Computer Science or a similar relevant field of studies or completed vocational training as well as several years of relevant on-the-job experience;
  • Knowledge e.g. of IT infrastructure, application management, databases, cloud, network, security, IAM, monitoring or other areas and proficiency at picking up new concepts and technology at a rapid pace;
  • Experience in structuring, presenting and communicating your work results with stakeholders at all levels;
  • Very strong ownership of your priorities, work structure and task management;
  • Proficiency in English.

Your future role

  • Design:
    You create the architecture for our digital services to ensure compliance with our policies and the fit into the Deloitte environment - looking at hosting, network, user access, data retention and all other aspects of solution design including those of sustainable operations.
  • Analyze:
    Design patterns, suppliers, products - you consider their effectiveness in addressing our functional as well as quality requirements in close collaboration with stakeholders.
  • Plan:
    During your projects, you create estimates for effort as well as implementation plans
  • Delivery:
    Together with your SA team, you act as the technical sub-project lead, responsible for coordinating and driving implementation together with subject matter experts and operations teams.
  • Share
    : You create the documentation and architectural views for your solution designs according to best-practice and present your work results to your stakeholders and peers to meet our internal standards and policies.

What we offer

  • Stable job in multinational company based on employment contract;
  • Working in flexible hybrid model - partially from home and the office;
  • Great opportunity for professional development (individual training plan, soft skills and technical trainings, access to modern training platforms)
  • Structured onboarding process and Buddy program for new joiners;
  • Open and friendly organizational culture based on the pillars of well-being and diversity & inclusion.

Selection process
Apply and create your future with us!

If your resume is of interest to us, the recruitment will consist of several stages:

  • Short online interview / short phone interview with Recruiter.
  • Interview/s with member/s of the team.

You will receive feedback regardless of process result.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

3 more openings in this category and country

Senior Application Security EngineerUnlimit · Serbia

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