Back End Engineer

About DescrialDescrial is a startup inside a twenty-year-old companyTresVista has run the analytical work behind private capital since 2006. 2,000 people, 400+ clients including some of the biggest names in the industry, no outside capital and no outside board. That was the first chapter. And we enjoyed getting here!The next chapter is harder and more interestingWe are moving from services to software, from one firm's workflows to an industry's, and from executing investment decisions to shaping how they get made. Thirty of us in King's Cross, small and senior, with day one founder intensity. At its fullest expression, Descrial changes how every serious investment firm decides.The roleYou report to the Head of Engineering and join the UK core team, shipping through disciplined CI/CD alongside the Bengaluru delivery organisation. The work combines service design with the production constraints of demanding enterprise users.Your remitThe services and contractsYou design REST and asynchronous services in Python 3.11+ and FastAPI, working at Java/Spring boundaries with PostgreSQL and async SQLAlchemy persistence. You implement tenant isolation, context, role-based access and configuration. You version and evolve contracts between core and AI services without breaking consumers.The production qualityYou maintain comprehensive unit and integration tests with pytest and pytest-asyncio and uphold code review standards. OpenTelemetry traces, structured logs, metrics and actionable alerts expose model-call latency, failure rates and token cost. You build validation, schema enforcement and safe failure behaviour for outputs that may be well-formed yet wrong. Authentication, authorisation, secrets, input validation, OWASP awareness and audit trails are part of everyday engineering.The delivery and costYou deploy and operate on AWS using EKS/ECS patterns, RDS and S3 through Jenkins quality gates. You improve queries, caching, asynchronous throughput and right-sizing. For model-calling services, you build queueing, rate limits and orchestration that account for cost.Your experienceYou have real multi-tenant or enterprise-system experience with isolation, permissions and auditability.You have 5+ years in backend engineering for production SaaS or platform systems.You have strong Python, using FastAPI or comparable frameworks, solid SQL/PostgreSQL and the ability to work atJava/Spring service boundaries.You have production AWS experience and are comfortable with Git, CI/CD and Linux.You use AI coding tools daily, such as Cursor or Claude Code, and have a considered view of where they help.You have a degree in engineering, computer science or a related field, or equivalent experience.Useful to have, none requiredJava/Spring depth alongside PythonEvent-driven architecture, queues and workflow enginesFinancial services or regulated-industry systemsLLM service integration patternsThe realityThis will be difficult.It demands pace and accuracy. We are building autonomous systems inside high-stakes live businesses, where decisions carry real consequences and impact and waiting for everyone to agree is not always an option.The systems will sometimes get things wrong. In this phase the London team needs to create the evaluations, visibilities and safeguards that catch mistakes early, reducing them over time and stopping the same failures happening again.If you want to build the foundations of an enterprise grade technology platform to service a multi-billion $ serviceable market opportunity, and share in that growth, this is your chance to join us.In our conversationsCome ready to discuss three pieces of work:A service or API contract you evolved without breaking its consumers.A tenant or permission boundary you implemented and tested.A production quality, reliability or cost problem you diagnosed and improved.CompensationThe all-inclusive package is typically £85,000–£105,000 a year, depending on experience.Practical detailsKing's Cross, London. In office (3 to 5 days a week), with colleagues in London and Bengaluru.Visa sponsorship is not available for this role.We aim to finish the process within three weeks. Tell us if you need an adjustment to the interviews.Descrial is an equal opportunity employer.The systems we are building will influence how important investment decisions are made. That makes a range of experiences and perspectives essential to building them responsibly. We want a team where different viewpoints are heard, respected and reflected in the work.Your application will be passed to our screening partner Chooseto.AI

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