{"id":3754491,"url":"https://alion.io/job/cloudmargin-senior-software-engineer-reliability-core-services","title":"Senior Software Engineer – Reliability & Core Services","company":{"id":3784655,"name":"CloudMargin","domain":"cloudmargin.com","url":"https://alion.io/company/cloudmargin","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"BambooHR","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"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":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Datadog","optional":false},{"name":"MySQL","optional":false},{"name":"Node JS","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-11-04T16:31:12Z","employer_posted_date":"2026-11-04","last_verified_at":"2026-11-06T20:41:13Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Company Profile\nCloudMargin is an award winning, growth-stage FinTech company offering an innovative Software-as-a-Service (SaaS) service. We are rapidly challenging the way financial and corporate institutions manage the collateral and risk associated with derivatives trading. We believe in offering our community an affordable, easy to deploy and scalable service.\nBacked by professional investment and corporate investors, our global team works closely across product, technology and sales disciplines. Our flat structure and ethos of openness and communication means you’ll be engaged with everyone in the business and have the senior leadership team as one of your key stakeholders.\nPrimary Purpose of Role\nWe’re looking for a Senior Engineer to join a full stack team dedicated to making CloudMargin’s platform faster, more stable and more resilient, and to leading critical, high-impact work that needs specialist expertise. Based in London, you’d work closely with our Principal Engineer and one other Senior Engineer. Because the team works across the whole platform, your work will shape technical decisions that affect every part of the product, and you’ll work regularly with other teams and senior stakeholders across the business.\nRecent work includes cutting latency on one of our file import types by 90%, which helped onboard a strategic client and reduced database load, and leading in-depth testing that de-risked a major platform-wide upgrade.\nCore Accountabilities\nDeliver major improvement projects. Help shape and deliver large pieces of work such as performance overhauls and platform migrations, from investigation through to rollout.\nFix systemic problems. Use tracing, metrics and logs to find recurring stability and performance issues across services and databases, then fix them or partner with the owning team to do so.\nOwn critical shared services. Maintain and improve essential services such as authentication and data access control, and help raise the standard of our shared libraries and service templates.\nKeep our older platform healthy. Between major projects, deliver a steady stream of smaller fixes and improvements to the older parts of the platform that run critical client workflows.\nBe a go-to expert when things go wrong. When production issues arise, you’ll be one of the people the business turns to, using your knowledge of the whole platform to diagnose and resolve them quickly. You’ll also step in on urgent, high-risk issues that need focused expertise, resolving risks before they become outages.\nJoin our on-call rota. You will be required to take part in our out-of-hours on-call incident rota once you have completed probation and settled into the team (usually around 5-6 months in). An on-call allowance is paid.\nWork across the organisation. Collaborate closely with product delivery teams and our platform team, respecting their ownership while helping introduce better architectural and operational patterns.\nExperience\nSenior-level backend engineering. Substantial production experience (5+ years) building and maintaining applications in TypeScript/Node.js. You’ve owned services end to end, from design through to running them in production. You also have some front-end experience and are happy to get involved in front-end work when it’s needed.\nHands-on AWS operational experience. You’re comfortable with infrastructure-as-code, containers, serverless and CI/CD, and you understand how these fail in production.\nStrong production debugging skills. You’ve diagnosed performance and stability problems in live systems you didn’t build, using observability tooling such as Datadog, and you can work at the database level (MySQL or similar) when queries are the problem.\nSkills\nEffective and pragmatic approach to AI. You use AI coding assistants and agents to speed up development, investigation and debugging, and you have clear views on how to get the most out of them, while also understanding AI’s limits and the problems these tools can create.\nClear written communication. You can explain a technical risk or trade-off to engineers and non-engineers alike.\nSelf-direction. You take ambiguous problems, work out what matters most and drive them to resolution with minimal steer.\nMaking others better. You make the engineers around you better through thoughtful code review, sharing what you know, and improving how we build and run software.\nEnjoyment of variety.You’re as comfortable making steady small improvements to an older, complex system as you are delivering a large project.\nEducation / Professional Qualifications\nNo formal educational requirements required\nEqual Opportunities\nhttps://cloudmargin.com/privacy-policy/","description_format":"text","description_chars":4702,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Stock Exchanges & Market Infrastructure","Financial Data & Market Intelligence"],"lifecycle":[{"event":"open","at":"2026-11-04T16:31:12Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":1,"expected_fill_days":36,"reasons":["conf:2","win:early"],"computed_at":"2026-11-06T05:58:05Z"},"pay":null,"html_url":"https://alion.io/job/cloudmargin-senior-software-engineer-reliability-core-services","json_url":"https://alion.io/job/cloudmargin-senior-software-engineer-reliability-core-services.json","meta":{"generated_at":"2026-11-07T00:42:20Z","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":1742,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-08T00:00:00Z"}},"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":3784655},"rest":"https://alion.io/mcp/rest/get_company?id=3784655"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcloudmargin-senior-software-engineer-reliability-core-services"},{"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%2Fcloudmargin-senior-software-engineer-reliability-core-services"},{"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%2Fcloudmargin-senior-software-engineer-reliability-core-services"},{"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/cloudmargin-senior-software-engineer-reliability-core-services\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcloudmargin-senior-software-engineer-reliability-core-services"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3754491}},{"tool":"search_jobs","arguments":{"company":"cloudmargin.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3754491},"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. Docs: https://alion.io/developers"}}