{"id":862520,"url":"https://alion.io/job/oktopayments-senior-software-engineer-gr110-dv","title":"Senior Software Engineer (GR110-DV)","company":{"id":679981,"name":"OKTO Payments","domain":"oktopayments.com","url":"https://alion.io/company/oktopayments","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Athens, Greece"],"countries":["GR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":48000,"max_usd":91000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":10},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon EC2","optional":false},{"name":"Amazon S3","optional":false},{"name":"API Gateway","optional":false},{"name":"AWS","optional":false},{"name":"AWS Lambda","optional":false},{"name":"CI/CD","optional":false},{"name":"DynamoDB","optional":false},{"name":"Git","optional":false},{"name":"IAM","optional":false},{"name":"Java","optional":false},{"name":"MySQL","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false},{"name":"Spring Cloud","optional":false}],"status":"live","first_seen_at":"2026-04-06T00:00:00Z","employer_posted_date":"2026-04-06","last_verified_at":"2026-11-02T12:18:51Z","board_verified":true,"closed_at":null,"days_open":210,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":210},"description":"OKTO PAYMENTS' continuous growth demands high-caliber candidates who embody professionalism, passion, and creativity. For those who join us, we offer significant career advancement, stimulating challenges, and a clear runway for growth.\nOKTO PAYMENTS is the next-generation Payment Service Provider - AI-native, precision-engineered, and relentlessly merchant-obsessed. Built for merchants operating in the most complex and demanding eCommerce sectors, our platform goes far beyond transaction processing. We solve for scale, compliance, and performance with one unshakable focus: delivering outcomes that power merchant growth.\nFrom payments and banking to treasury and settlement, we engineer the financial infrastructure that gives our partners a competitive edge. The result? Faster onboarding, smarter operations, and resilient, real-time performance.\nAt OKTO PAYMENTS, we enable merchants to Play Differently, transforming payments from routine transactions into true differentiators that deliver personalized, frictionless experiences.\nOur AI-native innovation harnesses data and insight to power every decision, while our proprietary in-house engineering ensures precision and control. Combined with deep, trust-based relationships worldwide, we’re redefining what it means to build, scale, and win in complex digital commerce.\nSummary\n As a Senior Software Engineer, you will play a key technical leadership role in architecting, designing, and developing our next-generation payment platform. This position requires deep expertise in distributed systems, Java-based microservices, and high-volume transaction processing. You will be responsible for ensuring the platform meets the highest standards of scalability, security, and reliability while working closely with product, infrastructure, and security teams.\nThis position offers tremendous career growth and the opportunity to make a direct impact in a rapidly expanding international company.\nYour responsibilities will include:\nLeading the design and architecture of complex distributed systems that handle real-time financial transactions at scale. \nSpearheading the integration of payment gateways, banks, card networks, and alternative payment methods.\nTaking a lead role in our transition to a microservices-based architecture for payments.\nCreating and maintaining high-quality, optimized code with robust unit tests and appropriate test coverage.\nProviding technical leadership, mentoring junior developers, and guiding the team in best practices and efficient coding techniques.\nCollaborating with cross-functional teams to deliver highly scalable, performant solutions.\nDriving continuous improvement initiatives, identifying bottlenecks, and optimizing the software development lifecycle.\nCollaborating with DevOps to optimize CI/CD pipelines, and monitoring strategies for production systems.\nRequirements\nExcellent academic background: Bachelor’s or Master’s degree in Computer Engineering or a related field.\nProven experience (7+ years) in backend software development, with at least 3 years leading teams and architecting payment systems.\nStrong understanding of payment flows, settlement, reconciliation, and fraud detection mechanisms.Deep knowledge of Java 11+, Spring Boot.\n\nStrong experience with AWS cloud services, including IAM, EC2, S3, Lambda, RDS, DynamoDB, and API Gateway.\nHands-on experience with transaction management, database tuning (PostgreSQL, MySQL, or NoSQL stores), and high-availability strategies.\nExtensive experience with Event-Driven Software Design Patterns and complex systems architecture.\nExpertise in microservices architecture, specifically with Java 11+, Spring Boot, Spring Cloud (Netflix OSS), OAuth2 Security, and JPA ORM.\nExpertise in designing secure RESTful APIs and working with OAuth2, JWT, and SSO mechanisms.\nAdvanced proficiency in Git for source control and versioning.\nStrong technical writing skills, with the ability to produce clear and concise technical requirements, design documents, and specifications.\nA proven ability to communicate complex technical concepts effectively in both Greek and English.\nBenefits\n Competitive Compensation\n Modern Equipment \n Career Growth\n Continuous Learning\n Inclusive Environment\n Work-from-home \n Birthday leave","description_format":"text","description_chars":4282,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"Greek","level":"All 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