{"id":136335,"url":"https://alion.io/job/stonex-poland-senior-net-software-engineer","title":"Senior .NET Software Engineer","company":{"id":2646,"name":"StoneX Group","domain":"stonex.com","url":"https://alion.io/company/stonex","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"iCIMS","truth_index":{"grade":"A","score":100,"open_postings":6,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":13,"computed_at":"2026-10-30T05:48:23Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bogotá, Colombia"],"countries":["CO"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Apache Kafka","optional":false},{"name":"Azure","optional":false},{"name":"C#","optional":false},{"name":"ChatGPT","optional":false},{"name":"Claude","optional":false},{"name":"Copilot","optional":false},{"name":"Docker","optional":false},{"name":"GitHub","optional":false},{"name":"Kubernetes","optional":false},{"name":"Redpanda","optional":false},{"name":"SQL","optional":false},{"name":"ASP.NET Core","optional":true},{"name":"Grafana","optional":true},{"name":"MS SQL","optional":true},{"name":"PostgreSQL","optional":true},{"name":"Rancher","optional":true},{"name":"TeamCity","optional":true}],"status":"live","first_seen_at":"2026-08-27T16:53:56Z","employer_posted_date":"2026-09-20","last_verified_at":"2026-10-30T06:39:06Z","board_verified":true,"closed_at":null,"days_open":63,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":63},"description":"Overview\nPermanent, full-time, hybrid in our office in Bogota.\nPlease submit your CV in English.\nConnecting clients to markets - and talent to opportunity. With 5,400+ employees and over 80,000 institutional, commercial, and payments clients, we operate from more than 80 offices spread across six continents. As a Fortune 100, Nasdaq-listed provider, we connect clients to the global markets - focusing on innovation, human connection, and providing world-class products and services to all types of investors.Whether you want to forge a career connecting our retail clients to potential trading opportunities, or ingrain yourself in the world of institutional investing, StoneX Group is made up of four business segments that offer endless potential for progression and growth.\nBusiness Segment Overview: Engage in a deep variety of business-critical activities that keep our company running efficiently. From strategic marketing and financial management to human resources and operational oversight, you’ll have the opportunity to optimize processes and implement game-changing policies.\nTech Stack You’ll Work With\nLanguages & Frameworks: C#, .NET Core, ASP.NET Core\n Architecture: Microservices, event-driven systems (Kafka, Redpanda)\nCloud & Infrastructure: Azure, Kubernetes, Docker, Rancher, TeamCity, Octopus, Grafana\n Databases: Microsoft SQL Server (T-SQL), PostgreSQL, NoSQL databases\nTooling: GitHub, Visual Studio, VS Code, Rider, ReSharper\nAI & Developer Tools: Microsoft Copilot, GitHub Copilot, ChatGPT, Claude\nResponsibilities\nPosition Purpose: We are hiring a Senior .NET Software Engineer to join the API & Middleware Group, a central platform team responsible for building scalable APIs, middleware services, and event-driven systems used across the organization.\nThis role focuses on designing and operating high-performance, low-latency services that run under significant load and strict reliability requirements. You will work on distributed, data-intensive systems that enable system-to-system integration and platform-level capabilities.\nThis role is ideal for an experienced .NET engineer who thrives on ownership, stays up to date with the newest .NET technologies, and brings deep expertise to high-load, low-latency systems.\nYou will collaborate closely with experienced engineers, tech leads, and QA partners, contributing to architecture, implementation, and operational excellence.\nPrimary Duties will include\nDesign and develop low-latency solutions using the latest .NET technologies; build performant, scalable backend services from scratch or improve existing ones\nWrite well-designed, testable, and efficient code; ensure designs are in compliance with specifications\nTackle live production challenges, including troubleshooting and performance issues\nDo proof of concepts to test out various ideas and technologies\nSupport continuous improvement by investigating alternatives and technologies and presenting these for architectural review\nMentor and support engineers with technical direction and best practices\nParticipate in code reviews (PRs), design sessions, and agile ceremonies; contribute as a strong team player\nWork closely with team leads, stakeholders, and other teams across the company\nContinuously explore and evaluate new technologies that could enhance the platform\nQualifications\nWhat We’re Looking For\nMinimum 5+ years’ experience building global enterprise-level systems\nKnowledge of financial markets or a strong desire to learn\nProven hands-on experience designing and developing enterprise applications using C# / .NET Core / .NET 8 or higher\nSolid grasp of .NET Core APIs, high-load systems, multithreading, and performance tuning\nExperience developing distributed systems using microservice architecture (event-based)\nExperience with messaging systems like Redpanda and Kafka\nHands-on experience with Kubernetes and containerization (Docker); experience working on cloud platforms (Azure preferred)\nExcellent knowledge of relational databases (SQL) and NoSQL databases\nStrong communication skills and the ability to collaborate across teams\nA growth mindset and eagerness to stay current with industry trends\nEducation\nBachelor’s degree in computer science, Software Engineering, or equivalent professional experience\nWhat We Offer\nWork on mission-critical systems used globally\nOwnership, and room to grow technically and personally\nA strong, collaborative engineering culture with talented peers\nSupport for continued technical and professional development\nWorking environment\nHybrid (Office location: Avenida Carrera 9A - Avenida Carrera 9A # 115-06/30 Edificio Torre Tierrafirme Bogotá, 110111 Colombia)","description_format":"text","description_chars":4672,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":true},"security_clearance":false,"languages":[]},"benefits":["Professional development"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Currency Exchange & FX Payments","Online Brokerage & Trading Platforms"],"lifecycle":[{"event":"open","at":"2026-08-27T16:53:56Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 24 · green card filings: 3","filings_12m":24,"filings_prev_12m":17,"green_card_filings_12m":3,"median_offered_wage_usd":122500,"route":null,"cap_exempt":false,"checked_at":"2026-10-29T16:27:21+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)","US Department of Labor: PERM disclosure data (green cards)"],"filings_for_role_12m":9}],"liveness":{"score":10,"band":"cold","label":"Long shot","p_open":1,"p_active":0.362,"p_room":0.28,"age_days":63,"expected_fill_days":13,"reasons":["conf:3","velocity","win:tail","crowd:"],"computed_at":"2026-10-30T05:48:23Z"},"pay":null,"html_url":"https://alion.io/job/stonex-poland-senior-net-software-engineer","json_url":"https://alion.io/job/stonex-poland-senior-net-software-engineer.json","meta":{"generated_at":"2026-10-30T09:04:47Z","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":12992,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-31T00:00:00Z"}},"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":2646},"rest":"https://alion.io/mcp/rest/get_company?id=2646"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fstonex-poland-senior-net-software-engineer"},{"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%2Fstonex-poland-senior-net-software-engineer"},{"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%2Fstonex-poland-senior-net-software-engineer"},{"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/stonex-poland-senior-net-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fstonex-poland-senior-net-software-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":136335}},{"tool":"search_jobs","arguments":{"company":"stonex.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":136335},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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