Software Engineer (Backend)

Job Description
As a Senior Lead Software Engineer at JPMorganChase within FICC eTrading, you will join an agile team building and supporting market-leading electronic trading platforms. You will deliver critical technology solutions across multiple technical areas and business functions in support of the firm's objectives, with a strong focus on engineering excellence, operational stability, and secure software delivery.

The FICC eTrading team partners with Global FICC businesses to deliver solutions for electronic trading across client and dealer markets, spanning a wide range of products including Rates, FX, Commodities, and Credit. The team is based predominantly in APAC, New York, London, and Athens and supports businesses globally.

This role is based in Athens, Greece.

Job responsibilities

• Design, build, test, and deliver high-quality software solutions for electronic trading systems, from requirements through production rollout
• Lead technical design discussions and contribute to architecture decisions, ensuring solutions are secure, scalable, and resilient
• Build and maintain low-latency, high-throughput services with a strong focus on performance, reliability, and correctness
• Integrate services with internal and external systems, ensuring well-defined interfaces, robust error handling, and operational readiness
• Own production outcomes by participating in on-call/support, triaging incidents, performing root-cause analysis, and driving permanent fixes
• Improve engineering standards through code reviews, automated testing, CI/CD, observability, and continuous refactoring to strengthen system health
• Identify recurring issues and data/operational patterns, and translate insights into measurable improvements in stability and developer productivity
• Contribute to an inclusive team culture and actively engage in communities of practice to evaluate and adopt relevant emerging technologies

Required Qualifications, Capabilities, And Skills

• Strong OOP/design patterns understanding and clean code practices
• Strong coding skills in Java and Spring with solid fundamentals
• Proven, hands-on experience across system design, application development, testing, and production support
• Experience with FIX protocol
• Experience with low-latency/high-throughput systems

Preferred Qualifications, Capabilities, And Skills

• Knowledge of fixed income products
• Exposure to agentic AI

ABOUT US
J.P. Morgan is a global leader in financial services, providing strategic advice and products to the world's most prominent corporations, governments, wealthy individuals and institutional investors. Our first-class business in a first-class way approach to serving clients drives everything we do. We strive to build trusted, long-term partnerships to help our clients achieve their business objectives.

We recognize that our people are our strength and the diverse talents they bring to our global workforce are directly linked to our success. We are an equal opportunity employer and place a high value on diversity and inclusion at our company. We do not discriminate on the basis of any protected attribute, including race, religion, color, national origin, gender, sexual orientation, gender identity, gender expression, age, marital or veteran status, pregnancy or disability, or any other basis protected under applicable law. We also make reasonable accommodations for applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs. Visit our FAQs for more information about requesting an accommodation.

About The Team
J.P. Morgan's Commercial & Investment Bank is a global leader across banking, markets, securities services and payments. Corporations, governments and institutions throughout the world entrust us with their business in more than 100 countries. The Commercial & Investment Bank provides strategic advice, raises capital, manages risk and extends liquidity in markets around the world.

• Are you an API Developer who enjoys building and improving REST APIs that power booking systems, partner integrations, and seamless user experiences?
• Would you like to work on scalable backend services integrating with external platforms, ticket providers, and mobile applications?
• Are you excited by the opportunity to collaborate with both technical and commercial teams while shaping the future architecture of a growing API ecosystem?

ManpowerGroup Greece,
on behalf of our client, is seeking an
API Developer with strong skills in Node.js or Express.js

Our client is an innovative travel-tech company that offers cultural and immersive experiences for museums, cities, and heritage sites through mobile apps and audio guides.

📌 Location: Athens City Center – Easily accessible by Metro

📍 Working Model: Hybrid (3 days in the office 2 days from home)

🖋️ Reporting to: Head of IT

What will you do:

As an
API Developer,
you will join their IT Team and participate in the development and maintenance of APIs and relevant connectivity layers that power their digital products and partner integrations. The role focuses on building and maintaining reliable APIs, supporting integrations with external partners (such as Online Travel Agencies and ticket providers), and ensuring smooth communication between the internal systems, mobile applications, and external services.

You will work closely with all the product teams (mobile, backend, and frontend) to expand the platform's capabilities and maintain stable integrations with partners.

More specifically, you will:

• Maintain and enhance existing REST APIs while designing and developing new services to support product expansion and integrations with external partners, agencies, booking systems, and ticket providers.
• Support connectivity for booking management, product availability, inventory synchronization, and partner data exchange, ensuring API reliability, scalability, and performance.
• Collaborate with internal teams and external technical partners to integrate backend services with mobile apps and internal tools, while supporting the technical aspects of commercial partnerships.
• Contribute to API documentation, monitoring, troubleshooting, automated testing, CI/CD processes, deployment workflows, and the continuous improvement of the overall API architecture.

Requirements:

• Degree in Computer Science, Engineering, Mathematics, or a related field.
• 3-5 years of professional experience in backend development, including API development and integrations
• Strong experience with Node.js or Express.js
• Experience building RESTful APIs
• Good understanding of API design and best practices
• Experience integrating with third-party APIs
• Experience with Docker
• Familiarity with CI/CD pipelines
• Experience writing unit tests
• Familiarity with Git-based workflows
• Experience in debugging and maintaining production systems
• Ability to communicate technical concepts clearly to internal teams, external partners, and non-technical stakeholders
• Excellent command of Greek and English languages

Any experience in the following will be considered an asset

• Experience with Swagger / OpenAPI, Laravel / PHP
• Strong understanding of API security concepts (authentication, authorization, API keys, OAuth)
• Experience with monitoring and logging tools
• Experience integrating with booking systems, ticketing platforms, or travel APIs

Benefits

• Competitive compensation package
• Private health insurance
• Healthy work–life balance and respectful working hours
• Ηybrid Working model
• Professional development opportunities in a dynamic environment
• Modern and friendly work environment

👥 Recruitment Process:

• If you’re interested in this role, feel free to apply directly. Our consultants will contact the candidates who meet the role requirements to arrange an interview.
• As for the next step, there will be 2 more interview rounds with the Hiring Manager, either online or in person.

For any questions regarding this opportunity, please contact Anna Georgiou directly at the following email: ageorgiou@manpowergroup.gr

#Empoweringtalent #WebelieveinTalent #ManpowerGroupGreece

The Role

Our Wallet Development team is growing in Greece and we are now looking for a Backend Software Engineer to join! Engagement at Betsson Group ensures our customers come back for more. It’s all about loyalty. We provide a world class customer experience beyond the game play featuring Tournaments, Dynamic personalized campaigns and much more! 

You will be part of preparing our journey to containerization, increasing the scalability of our systems while also maintaining their high quality. To accommodate new requirements, we are constantly re-evaluating our systems design and working on exciting new features.

What you'll do

• Design and develop distributed backend services using .NET and event-driven architecture.
• Collaborate with product and commercial teams to turn engagement ideas into scalable, maintainable, and user-friendly solutions.
• Optimize our microservice ecosystem for performance, reliability, and observability.
• Drive our containerization and cloud migration strategy forward.
• Participate in architecture discussions and help shape technical decisions.
  • For senior engineers
    Lead architectural decisions and proactively identify areas for improvement.
• Write maintainable, well-tested code and conduct code reviews.
• Participate in incident resolution and the team’s on-call rotation.
• Maintain clear technical documentation such as ADRs, runbooks, and guidelines.
• Build and share your domain expertise within the team.

What Tech Stack you'll be working with

We don’t expect you to know everything listed below – but the more you’re familiar with, the better. What matters most is your ability to learn, collaborate, and write high-quality, maintainable code. 

Core Technologies

These are essential to the role, and we’re looking for solid experience here – especially for senior candidates.

• Languages & Frameworks
  C#, .NET (modern versions after .NET Core)
• Databases
  SQL Server, PostgreSQL, Redis, Couchbase 
  (experience with relational or document databases, including indexing and query optimization, is a strong plus)
• Cloud & Containers
  AWS, Kubernetes, Docker 
  (experience with any major cloud provider or containerization platform is valuable)
• Testing & Quality
  xUnit/NUnit, mocking frameworks, k6 for load testing 
  (understanding of unit, integration, and performance testing is more important than specific tools)

Additional Tools & Practices

Familiarity with these of similar tools and concepts is a plus.

• Messaging & Microservices
  Web APIs, Apache Kafka, RabbitMQ, Orleans 
  (experience with any messaging or actor-based system is valuable)
• Observability
  Prometheus, Grafana, Loki, Splunk 
  (or experience with other observability stacks)
• CI/CD
  GitHub Actions, trunk-based development, progressive delivery 
  (familiarity with continuous delivery pipelines and deployment strategies is more important than specific tooling)
• Architecture
  Domain-driven design, event sourcing, actor model, distributed systems at planet-scale
• Ways of Working
  Agile and Lean principles, DevOps mindset, strong collaboration

 

What we offer

• Monthly Allowance for Lunch
• Private & Life Plan Insurance for you and your family
• Annual Wellness Allowance
• Team Building Budget
• Corporate Travel Insurance
• Events and initiatives both Local (Quarterly Meetings) and Global
• Professional Development Programs & Internal Career Opportunities
• Milestone Birthday

 

We can also offer you an environment full of ambition and passion. One day is never like the other as the only constant is change, to the better, to the greater. We strive to be the best in whatever field we choose to play on, and we make sure to have fun along the way!

 

Challenge accepted?

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About Allwyn Hellas

OPAP is now Allwyn
, entering a new era of transformation powered by digitalization, innovation and unique experiences for retail and online customers.

Allwyn is a multi-national gaming entertainment company, lottery-led, with leading market positions and trusted brands across Europe and North America.
Our purpose is to make play better for all
by focusing on innovation, technology, player safety and returning more to good causes across a growing casual gaming entertainment portfolio.

This new era brings more for our people. Whatever your role, you’ll feel part of something bigger and empowered to
make an impact
, with opportunities to
accelerate your ambitions
, develop your talent and thrive alongside colleagues around the world.

Allwyn has been recognized as a
Top Employer in Greece
for four consecutive years (2023–2026), reflecting our commitment to creating a workplace that truly stands out and focuses on our people.

A Winning Career Awaits.

So what’s the challenge…

As a
Senior Software Developer
, you will play a key role in shaping and delivering high‑quality software solutions. You will lead the analysis, design, and implementation of new concepts, ensuring they meet technical requirements and standards. You’ll also oversee the seamless integration, deployment, configuration, and ongoing maintenance of these solutions-driving reliability, performance, and long‑term scalability.

What your day to day will include:

• Reviewing business and technical requirements and designing scalable, modular software solutions.
• Leading the development and refactoring of applications in line with architectural standards and the platform roadmap.
• Identifying technical debt proactively and driving refactoring or modernization initiatives to enhance maintainability and performance.
• Ensuring high software quality through code reviews, debugging, troubleshooting, and close collaboration with the QA team.
• Following best practices and patterns, delivering clean, testable code, and applying Test‑Driven Development (TDD).
• Monitoring application performance and providing 2nd and/or 3rd‑level maintenance and support to ensure long‑term stability and reliability.
• Translating business needs into clear technical specifications (SoW) and design artifacts.
• Responding to ad‑hoc assignments that support evolving business needs, aligned with the scope of the role and your professional capabilities.
• Staying up to date with emerging technologies and industry best practices and proposing improvements that elevate the efficiency and speed of operations.

What you’ll bring:

• BSc in Computer Science or Information Technology or equivalent STEM
• MSc in relevant topic is desirable
• Demonstrated experience as a SW engineer, preferably in all phases of the Software Lifecycle
• Understanding of Lottery/Gaming/Betting/Casinos, Passive/Scratch systems and business concepts (desirable)
• Strong experience in enterprise‑level Java/J2EE development, using frameworks and tools such as Spring Boot, Hibernate, JPA, JavaEE/JakartaEE, and JUnit.
• Solid background in relational and non‑relational databases (MySQL, Postgres, Oracle, MongoDB) and a good understanding of RESTful API design and systems integration with JSON/XML/SOAP.
• Proficiency in core engineering practices including Git or Subversion, CI/CD pipelines, Agile methodologies, and familiarity with Linux environments.
• Deep understanding of scalable application design principles and commitment to Clean Code and Clean Architecture for high‑quality, maintainable software.
• Strong analytical, organizational, debugging and troubleshooting skills for resolving complex technical issues effectively
• Communicating effectively in Greek and English, with strong written and verbal skills

What’s in it for you?

🚀 An award-winning working environment

💸 Competitive salary package and bonus scheme

🩺 Health insurance coverage, Pension Plan and Annual Health Checkup

💻 Hybrid working model

🏢 State of the art facilities including gym & restaurant

🎓 Continuous learning powered by Allwyn Academy

💼 Internal career opportunities

👪 Family Support incl. daycare voucher and assisted reproduction voucher

🌱 Volunteering program, including 2 extra days off to give back

💪 Well-Being Program incl. sports teams, nutritionist & psychologist services, Employee Assistance line and more

🗓️ Allwyn Day - one extra day off

🍴 Monthly food allowance

🚌 Shuttle service for easy commute to our offices

🛍️ Exclusive employee discounts across a range of partners ️

Allwyn is an equal opportunity employer, welcoming talented individuals from all backgrounds.

Does this opportunity sound exciting to you? If yes, we would love to hear from you!