• Strong experience building mobile applications (iOS or Android) in production environments
• Experience with backend services and APIs
• Familiarity with AI-assisted development tools (Claude, ChatGPT, Gemini, etc.)
• Solid understanding of mobile platform internals (permissions, messaging systems, sandboxing, etc.)
• Experience designing scalable architectures and making system-level decisions
• Comfortable working with cloud infrastructure and distributed systems
• Ability to operate with high autonomy and navigate ambiguous requirements
• Strong communication skills and experience working with senior stakeholders

• Experience working on early-stage initiatives
• Experience with consumer-facing products
• Exposure to security-related domains (authentication, fraud detection, phishing, etc.)
• Experience working in fast-paced innovation or experimentation teams

The Security Engineer is responsible for building, maintaining, and improving defensive security measures, tools, and processes that protect systems, applications, and data. This role works closely with the Security, DevOps, and Engineering teams to proactively identify risks, remediate vulnerabilities, and strengthen the overall security posture of the organization.

Key Responsibilities:

- Maintain and enhance intrusion detection and prevention systems (IDS/IPS).
- Support the vulnerability management lifecycle, including scanning, triage, remediation, and reporting.
- Develop and maintain security automation scripts and tooling to improve efficiency and reduce manual work.
- Partner with SOC Analysts during incident response to investigate, contain, and remediate threats.
- Collaborate with DevSecOps engineers to secure CI/CD pipelines, containers, and cloud infrastructure.
- Conduct regular security assessments of infrastructure, applications, and configurations.
- Assist in implementing and maintaining endpoint security controls and monitoring solutions.
- Research emerging threats, attack techniques, and security tools, applying them to strengthen defenses.
- Document security standards, procedures, and response playbooks.

Required Qualifications:

- Experience in security engineering, system administration, or related roles.
- Solid understanding of network security concepts (firewalls, IDS/IPS, proxies, VPNs).
- Experience with vulnerability management tools and processes.
- Strong scripting skills in Python, Bash, or PowerShell for automation and tooling.
- Familiarity with cloud platforms (AWS, Azure, or GCP) and securing cloud-native services.
- Hands-on experience with endpoint security tools and monitoring solutions.
- Strong analytical and problem-solving skills with the ability to think like an attacker.

Preferred Qualifications (Nice-to-Haves): Experience securing containerized workloads (Docker, Kubernetes); knowledge of compliance frameworks (PCI-DSS, SOC 2, NIST, ISO 27001); familiarity with SIEM solutions and log analysis; and experience with Infrastructure as Code (Terraform, CloudFormation).

Join us! 

We are looking for a Kotlin Engineer (Buenos Aires based) to join Arion's team!

We are seeking a Senior Software Engineer to anchor the Mobile Service Layer (MSL), the Backend-for-Frontend (BFF) that serves as the orchestration brain for premium travel applications.
This isn’t a traditional CRUD backend role or a pixel-pushing UI position. We seek for an engineer who understands the native mobile lifecycle deeply enough to architect high-performance, mobile-optimized APIs at scale. You will be the technical bridge between native Android and iOS teams and a complex web of travel data partners, ensuring every mobile interaction is fast, reliable, and secure.

If you thrive in a fast-paced, collaborative environment and appreciate leveraging your team's expertise to deliver high-quality solutions, this role might be for you!

What you'll do:

● Architect the Orchestration Layer: Design and maintain scalable, Kotlin-based APIs that aggregate data from multiple enterprise sources into lean, performant payloads purpose-built for mobile consumption, respecting device constraints like battery, bandwidth, and lifecycle state.
● Own the Integration Contract: Define and evolve the formal API contracts and schema governance that decouple upstream mobile release cycles from internal platform iteration, enabling independent team velocity without sacrificing stability.
● Drive System Performance: Proactively identify and resolve bottlenecks across the API and integration tiers, targeting sub-second response times and high availability within a travel ecosystem that demands real-time pricing, availability, and booking confirmation.
● Collaborative Technical Leadership: Engage in high-level architectural discussions and partner with cross-functional teams (iOS, Android, QA, and external partners) to define, design, and ship features that meet enterprise security and compliance standards.


What we're looking for:

● The Hybrid Edge: 7+ years of professional software development experience, including substantial work in server-side Kotlin and deep familiarity with the Android SDK. You understand mobile constraints well enough to build backend services that respect them.
● BFF Pattern Mastery: Proven track record implementing the BFF pattern with RESTful APIs or GraphQL in high-traffic production environments, not toy projects, but systems handling millions of requests with real SLA pressure.
● Architectural Discipline: Comfort operating within established enterprise architectures, navigating complex dependency chains and downstream service tiers, with the judgment to evolve them incrementally without breaking production.
● Modern Stack Proficiency: Deep skill in Kotlin Coroutines and Spring Boot, with the ability to design solutions spanning multiple database systems and asynchronous workflows.
● Agile Execution: You thrive in Agile/Kanban environments and bring the collaborative instincts needed to work alongside external clients, partners, and vendors with competing priorities.
● Ownership Mentality: You don’t wait for tickets. You see systemic issues, propose solutions, and drive them to completion.
● Advanced English level.

We are seeking a highly skilled and experienced Senior Ruby Engineer to join our team. You will play a pivotal role in shaping and delivering high-quality solutions while mentoring and coaching the development team to achieve technical excellence. If you thrive in a fast-paced, collaborative environment and are passionate about driving innovation in Ruby on Rails development, we encourage you to apply.

WHAT YOU'LL DO

• Implementation of scalable and high-performance solutions using Ruby on Rails, optimizing application performance for various scenarios.
• Develop architectural solutions to facilitate seamless integration of client/third-party services and APIs within our applications.
• Create and maintain comprehensive documentation of the application architecture, ensuring all team members have a clear understanding of design decisions and implementation details.
• Stay updated on the latest industry trends, emerging technologies, and best practices in Ruby on Rails development, incorporating them into our architecture as appropriate to drive continuous improvement.

WHAT WE NEED FROM YOU

• Bachelor's or Master's degree in Computer Science or a related field, or equivalent experience.
• Minimum of 10 years of overall software development experience, with at least 6 years of hands-on experience with Ruby on Rails.
• Strong expertise in Ruby on Rails development, with a focus on writing clean, maintainable code.
• Proficiency in JavaScript, particularly in the frontend development using modern frameworks/libraries such as Reactjs or Vuejs.
• Excellent communication skills in English, both oral and written.
• Familiarity with agile development methodologies and practices.
• Great to have: Experience in coaching and mentoring development teams, guiding them to success.

Sr. Backend Developer 

Are you someone who loves turning bold ideas into reality? Does the thought of experimenting with cutting-edge tech and creating quick Proof of Concepts (POCs) excite you? At Arionkoder, our Innovation Team is searching for a Backend Developer who thrives on pushing boundaries and sharing their journey through impactful communication. If you’re passionate about reshaping what’s possible with technology, we’d love to meet you.

What You’ll Do

• Experiment and Build: Rapidly prototype and iterate on backend solutions, creating POCs to explore new ideas and validate use cases.
• Collaborate Creatively: Partner with frontend developers, ML engineers, and domain experts to design and deliver innovative solutions.
• Integrate Thoughtfully: Integrate AI/ML models into backend systems, optimizing their performance for scalable, real-world applications.
• Optimize and Secure: Build scalable, secure systems using AWS services and adhere to industry best practices.
• Mentor and Lead: Guide team members, sharing your knowledge and fostering a culture of curiosity and experimentation.

What We’re Looking For

• Curiosity and Passion: You’re eager to explore emerging backend technologies and stay ahead of the curve.
• Hands-On Problem-Solver: You’re driven to create, prototype, and refine solutions quickly, learning from successes and failures alike.
• Great Communicator: You excel at making technical ideas accessible, inspiring your team and the broader organization.
• Team-Oriented Mindset: You succeed in multidisciplinary teams and believe innovation is strongest when perspectives combine.
• Technical Expertise:
• Proficiency in Python and FastAPI for backend development.
• Strong experience with AWS services (Lambda, API Gateway, RDS, S3, etc.).
• Familiarity with integrating AI/ML models into backend systems.
• Solid understanding of CI/CD pipelines, RESTful APIs, and GraphQL.

Extra skills that can make you stand out:

• Experience with monitoring and observability tools (e.g., CloudWatch, Datadog).
• Familiarity with conversational AI, natural language processing (NLP), Computer Vision or ML based predictive models is nice to have.
• Knowledge of Docker, containerization, and debugging tools.
• Exposure to event-driven architectures and message queues (e.g., SQS, SNS, Kafka).
• Knowledge of Infrastructure-as-Code tools like Terraform or AWS CDK.
• Understanding of database optimization and performance tuning for both SQL and NoSQL databases.

Why Join Us? 

At Arionkoder, innovation isn’t just a buzzword; it’s our way of working. As a Back-End Developer on our Innovation Team, you’ll have the freedom to experiment with cutting-edge technologies, build Proof of Concepts, and deliver impactful solutions that shape the future. From integrating advanced AI models to solving real-world challenges, you’ll work at the forefront of technology in a team that values creativity, learning, and collaboration.

Ready to build the backbone of tomorrow’s innovations? Apply now!

We are looking for a Rust Engineer to join Arion's team!

Our remote Tech Tribe team is expanding, and we are seeking a skilled Rust Engineer to join us. If you thrive in a fast-paced, collaborative environment and appreciate leveraging your team's expertise to deliver high-quality solutions, this role might be for you!

WHAT WE NEED FROM YOU:

• Excellent oral and written English communication skills.
• Advanced proficiency in the Rust programming language.
• Experience working in Agile environments.
• Backend developers, as Sr as possible with 1 or 2 years of experience in Rust, and ideally have worked with other technologies such as Node, Python.
• AWS and its tools.