{"id":2117239,"url":"https://alion.io/job/vistulo-senior-c-engineer-trading-systems","title":"Senior C# Engineer (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":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Wrocław, Poland","Warsaw, Poland","Kraków, Poland","Poznań, Poland","Gdańsk, Poland"],"countries":["PL"],"hiring_countries":["PL","RO"],"hiring_countries_total":2,"salary":null,"salary_estimate":{"min_usd":54000,"max_usd":87000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":227},"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"C#","optional":false},{"name":"Java","optional":false}],"status":"live","first_seen_at":"2026-10-08T11:05:12Z","employer_posted_date":null,"last_verified_at":"2026-10-08T11:05:12Z","board_verified":false,"closed_at":null,"days_open":6,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":6},"description":"Want to work on FX electronic trading systems at a top N. American Bank?\nThis isn’t just another dev role. It’s your chance to engineer the core of global trading.\nWe’re talking ultra-low-latency architectures, real-time market data, and speedy electronic trading, all in an environment where milliseconds matter, and billions move. You’ll work on building FX (forex) electronic trading systems.\nIf you thrive on complexity, love solving performance challenges under pressure, and want to collaborate directly with traders and product teams at the sharp edge of financial technology, this is your arena.\nThe Role at a Glance\nSenior C# .NET Backend Engineer\n\nBuilding a trading systems, including high-performance backend services for market data and electronic trading\n\nFully remote for a top N. American bank (for residents of Poland or Romania)\n\nPart of the core team - this is not a legacy support role or an outsourced B team\n\nThis role requires experience building trading systems, and an understanding of financial markets. An ideal candidate will have worked on FX trading systems.\nIf you enjoy working on low-latency, high-throughput trading systems, join us and build the next generation of high-performance capital markets solutions.\nWhy Join Us?\nWork on a large-scale, low-latency trading system.\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 C# development experience. They must also be curious, open-minded, and desire to learn new things. English proficiency is a must. 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.\nThis is a fully remote 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.\nOnly open to residents of Poland or Romania. Citizens and legal residents with permission to work in Poland or Romania are welcome. \n\nWhat we offer\nWork that matters in the financial domain: You’ll be building a high-performance trading system at an established financial institution.\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 based in Poland or Romania.\n\nCompetitive Compensation: Top pay and ample time-off options.\n\nResponsibilities\nDesign and implement robust software solutions for FX trading systems using C# .NET.\n\nCollaborate with other teams to research and implement changes to the trading system.\n\nCreate thorough test cases to ensure software stability and reliability.\n\nCollaborate with operations teams regarding building new features and improving existing functionality.\n\nSupport production issues, including independently completing root-cause analysis and diagnosis.\n\nProcess business requirements with minimal guidance, derive implementation proposals, and implement them with a team or individually.\n\nMentor junior developers.\n\nRequirements\nMust have\n7+ years of professional C# .NET development experience, with a strong understanding of programming concepts, including algorithms, complexity, and multi-threading, and Java’s language capabilities and standard libraries.\n\nGood knowledge of the data structures: familiarity with the .NET collections library, depth of understanding of the commonly used data structures, and intuition on what to use when.\n\nProven experience building backend services for front-office trading systems.\n\nDeep understanding of front-office workflows and electronic trading platforms (any asset class).\n\nBuilt or contributed to the development of an electronic trading system (any asset class).\n\nExpertise in multi-threading, event-driven systems, and performance tuning.\n\nAbility to break down complex workflows into maintainable, high-quality solutions.\n\nStrong communication skills and comfort working in high-stakes, trader-facing environments.\n\nKnowledge that is required for building low-latency (measured in microseconds) trading systems.\n\nFamiliarity with the FIX protocol.\n\nAbility to align your work with a 6-hour overlap with US Eastern business hours.\n\nNice to have\nFamiliar with Broadway FX.\n\nFamiliar with Java.\n\nA computer science degree from a top Polish school.\n\nThe recruitment process\nSubmit your CV.\n\nAnswer a few written questions and a short programming exercise which you can do at your own pace.\n\nParticipate in a three-stage interview process:\nWritten screen\n\nTechnical screen interview\n\nThree technical interviews with future team members\nDiscuss your experience and skills.\n\nSolve verbal algorithm problems (focus on clarity and understanding).\n\nTackle live coding challenges (no trick questions).\n\nSuccessful candidates will need to pass a standard background check.\nTech stack\nC#\nTrading Systems\nData Structures\nJava","description_format":"text","description_chars":5725,"description_truncated":false,"requirements":{"experience_years_min":7,"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":"2026-10-08T22:59:03Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring 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