{"id":2112725,"url":"https://alion.io/job/vistulo-senior-java-backend-engineer-core-java-trading-systems","title":"Senior Java Backend Engineer (Core Java, Trading Systems)","company":{"id":3861023,"name":"Vistulo","domain":"vistulo.com","url":"https://alion.io/company/vistulo","size_band":null,"is_staffing_agency":false,"employer_type":"staffing","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"contractor","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Kraków, Poland","Wrocław, Poland","Poznań, Poland","Warsaw, Poland","Katowice, Poland","Gdańsk, Poland","Lublin, Poland","Łódź, Poland","Szczecin, Poland","Rzeszów, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":220,"max":240,"currency":"PLN","period":"hour","gross":null,"usd_annual":122000},"salary_estimate":null,"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Java","optional":false},{"name":"AWS","optional":true},{"name":"Spring Boot","optional":true}],"status":"live","first_seen_at":"2026-09-30T09:38:06Z","employer_posted_date":null,"last_verified_at":"2026-09-30T09:38:06Z","board_verified":false,"closed_at":null,"days_open":12,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":12},"description":"Join the Java Engineering Team at a top N. American Bank\n\nAre you a Java engineer who enjoys working on large scale and high performance software? Do you love working with smart people on meaningful technology? Want to work in capital markets on financial trading systems? If so, read on.\n\nThe Role at a Glance\n\nSenior Java Backend Engineer\n\nFully remote for a top N. American bank (for residents of Poland or Romania)\n\nOpenings on multiple teams in the capital markets division (prime brokerage, platform team)\n\nPart of the core team - this is not a legacy support role or an outsourced B team\n\nWe’re hiring experienced backend engineers (6+ years) to join a major N. American bank — directly supporting the development of financial trading systems. This is not a legacy maintenance or support role — you’ll be part of the core product team, building highly-performant, low-latency systems used across the firm.\n\nAre you a passionate Java developer who thrives on solving complex problems in low-latency, high-throughput trading systems? Join us and work on interesting financial system engineering problems.\n\nWhy Join Us?\n\nWork on a large-scale, low-latency trading system processing millions of daily transactions.\n\nNo Legacy: Join an actively developed system — the engineers who built it originally are still on the team.\n\nCollaborate with a world-class team of developers across North America and Europe.\n\nEnjoy the stability of a long-term, fully remote role that only a bank can offer.\n\nA successful candidate will be a very strong programmer with current Java development experience. They must also be curious, open-minded, and desire to learn new things. English proficiency is a must.\n\nThis role is for developers who excel at programming core Java from the ground up, not just integrating frameworks or APIs. If you’re fascinated by understanding systems ‘under the hood,’ this role is for you. Successful candidates enjoy geeking out about data structures and debugging application performance issues.\n\nThis is a fully remote backend Java development role for a developer in Poland or Romania. You will be working through a Polish company that will provide the support and administrative assistance to make you successful in the role. We are looking for people to join the team long-term.\n\nDifferent teams have different working hour arrangements. For all roles, to ensure efficient onboarding, you’ll work in sync with the American team during US Eastern business hours for the first two months. Working this way maximizes your time overlap for answering questions, which means you can learn quickly. That means working until 21:00 CET. After that, some teams offer more flexibility your schedule can shift closer to standard Polish business hours.\n\nOnly open to residents of Poland and Romania. Citizens and legal residents with permission to work in Poland or Romania are welcome. \n\nWhat we offer\n\nWork that matters in the financial domain: Work on a trading system at an established financial institution, processing millions of transactions daily.\n\nProfessional growth: Collaborate with smart, highly capable developers in a supportive and challenging environment.\n\nDirect collaboration: You will work directly with the client team in North America and in Europe.\n\n1st-tier work: This is not a technical support or legacy maintenance role. The system is functional and is actively being built and you will take part in updating it. The people who built the system are still part of the team.\n\nLong-term commitment: This is not a fixed-scope or fixed-term outsourcing role; we value people who want to grow and contribute long-term.\n\nFlexibility & remote work: Fully remote position with increasing schedule flexibility post-onboarding.\n\nCompetitive Compensation: Above-average pay and ample time-off options.\n\nZakres obowiązków\n Design and implement robust software solutions for the bank’s trading systems using core Java (versions vary from team to team, and include 8, 17 and 21).\nUnderstand, develop, and improve the subsystems used by other teams in the trading platform.\nCreate thorough test cases to ensure software stability and reliability.\nCollaborate with operations teams regarding building new features and improving existing functionality.\nSupport production issues, including root-cause analysis and diagnosis.\nWymagania\nMust have\n\nStrong understanding of programming concepts, including algorithms, complexity, and data structures.\n\nGood knowledge of the data structures in the Java standard library - both breadth and internals.\n\nExperience building distributed service-based applications based on message queues.\n\nStrong analytical and problem-solving skills, to effectively diagnose production performance issues measured in microseconds.\n\nOpen mind, curiosity, and a strong desire to learn new technologies and business domains.\n\nAbility to clearly explain non-trivial systems and algorithms.\n\nAbility to follow and understand technical conversations.\n\nKnow when and how to ask questions that speed up learning.\n\nAbility to align your working schedule to US Eastern business hours.\n\nNice to have\n\nExperience with financial markets and trading systems.\n\nKnowledge of AWS systems.\n\nExperience with Spring boot (some teams).\n\nExperience with JVM tuning (some teams).\n\nExperience working remotely with North American firms.\n\nA computer science degree from a top school.\nTech stack\nJava\nCore Java\nAlgorithms\nData structures\nMessage queues\nJVM tuning\nAWS\nSpring Boot\nFintech / Trading","description_format":"text","description_chars":5516,"description_truncated":false,"requirements":{"experience_years_min":6,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"},{"name":"Romania","iso":"RO","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Security Compliance","Recruiting & Staffing","IT Staffing & Staff Augmentation"],"lifecycle":[{"event":"open","at":"2026-10-08T22:25:03Z"}],"visa":[],"liveness":{"score":75,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.832,"p_room":0.9,"age_days":11,"expected_fill_days":22,"reasons":["seen:11","velocity","win:mid"],"computed_at":"2026-10-12T06:55:09Z"},"pay":{"stated_usd_annual":122000,"is_top_pay":false},"html_url":"https://alion.io/job/vistulo-senior-java-backend-engineer-core-java-trading-systems","json_url":"https://alion.io/job/vistulo-senior-java-backend-engineer-core-java-trading-systems.json","meta":{"generated_at":"2026-10-12T17:28:32Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":27984,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-13T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":3861023},"rest":"https://alion.io/mcp/rest/get_company?id=3861023"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fvistulo-senior-java-backend-engineer-core-java-trading-systems"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fvistulo-senior-java-backend-engineer-core-java-trading-systems"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fvistulo-senior-java-backend-engineer-core-java-trading-systems"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/vistulo-senior-java-backend-engineer-core-java-trading-systems\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fvistulo-senior-java-backend-engineer-core-java-trading-systems"}]}