Senior software engineer

Thyll Müller

I’m a Senior Software Engineer at JPMorgan Chase, building high-performance trading platforms where resilience and precision matter. I specialise in Python, modern web technologies, and backend systems, turning complex, business-critical workflows into clear, maintainable products that perform reliably in production.

+44 7706 746800 · thyll.muller@gmail.com · linkedin.com/in/thyllmuller · Bilingual: English / German

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Experience

JPMorgan Chase

2023 to Present

High-volume trading & risk systems

Senior Associate Software Engineer (SWE III)

Current role

Delivered major trading-platform initiatives in a regulated environment, combining product ownership, delivery leadership, and operational support.

Bond Portfolio TRS Athena migration
  • Led the design and delivery of the trade-capture UI for the Bond Portfolio TRS migration to Athena, replacing an error-prone legacy booking workflow with a modern, resilient interface.
  • Enabled the desk to scale while reducing trade-booking time and improving workflow efficiency.
  • Supported the full go-live lifecycle from instrument build through trade capture, pricing, and lifecycle management, improving reporting accuracy for Operations, Risk, and P&L.
Legacy trading platform tactical modernisation
  • Contributed to the migration of a long-established monolithic trading platform to a cloud-native Java backend and TypeScript/React frontend.
  • Migrated financial instruments while achieving behavioural and risk parity through comprehensive regression testing and integration with existing trading infrastructure.
  • Used AI-assisted reverse engineering to accelerate analysis and implementation of legacy functionality where subject matter expertise was no longer available.
  • Developed cloud-based (AWS) risk calculation services, improving platform scalability, resilience, and long-term maintainability.
General engineering impact
  • Championed continuous engineering improvements by refactoring large monolithic modules into focused, well-tested components.
  • Reduced commit contention and workflow pileup despite increased development activity.
  • Supported first-of-its-kind exotic derivative trade bookings.
  • Managed a summer intern to build an automation framework for lower-environment trade bookings to accelerate developer and QA testing.

Junior Associate Software Engineer (SWE II)

Earlier role

Credit Derivative Flow bulk trade management

Built and shipped new bulk trade-management capabilities for Credit Derivative Flow products within Athena, improving workflow accuracy and reducing reliance on manual operations.

  • Designed and implemented GraphQL APIs and front-end view models to support complex trade-management workflows across Athena Trade and Risk systems.
  • Replaced fragile, generic operational processes with dedicated tooling that reduced manual intervention.
  • Provided high-priority production support for CDS and index products, while owning quarterly IMM processing.

Waracle

Junior Python Developer

Global pharmaceutical company · data pipelines Sep 2022 to Apr 2023

Supported a global pharmaceutical company in building and testing data pipelines for a mobile drug-testing application, helping maintain reliable data flows as the programme progressed into further trial phases.

  • Wrote unit and integration tests and created custom APIs to interact with Azure Cosmos DB.
  • Configured Docker containers to mirror client infrastructure for strict testing requirements.
  • Worked within a large agile delivery team using version control and collaborative engineering practices.

IBM

Conversational Analyst

Government financial institution · NLP user support Mar 2022 to Sep 2022

Contributed to the early build-out of NLP capabilities for user support at a government financial institution, helping translate client requirements into practical conversational-AI improvements.

  • Helped build conversational AI capabilities using NLP and NLU to support clearer, more reliable user journeys.
  • Worked closely with clients to translate requirements into practical, production-ready solutions.

Selected contributions

Engineering work in practice.

Workflow modernisation Delivered user-facing improvements for complex, regulated workflows.
Legacy systems Contributed to modernising established platforms and strengthening maintainability.
Production support Supported reliable operation of time-sensitive, business-critical processes.
Team enablement Improved engineering workflows and created automation to support development and testing.

Skills

A concise view of the toolkit.

Core languages

Python Primary

JavaScript / TypeScript Production

SQL Production

Backend & APIs

FastAPI Production

GraphQL Production

REST Production

Frontend

React Production

AgGrid Production

Material UI Working

Platform & testing

Docker Production

AWS / Azure Working

PyTest / Jest Production

Engineering philosophy

How I approach building software.

I enjoy simplifying complex systems into maintainable products that are dependable in production. My focus is on delivering software that is reliable, easy to evolve, and backed by measurable outcomes. I care about ownership, clear architecture, and engineering practices that help teams move quickly without sacrificing quality.

Education

Academic background

University of Strathclyde

Data Analytics MSc. (Distinction, 82%)

Sep 2021 to Sep 2022

  • Specialised in artificial intelligence, machine learning, and deep learning.
  • Worked with Python, R, SQL, TensorFlow, PyTorch, Scikit-learn, and XGBoost.

University of Glasgow

Pharmacology BSc. (Hons) (2:1)

More

Sep 2017 to Jul 2021

My scientific training led naturally into data analytics and, ultimately, software engineering: a path grounded in rigorous analysis, experimentation, and problem-solving.

  • Built strong foundations in experimental design, statistics, and scientific analysis.
  • Completed an honours project on vitamin D and COVID-19 morbidity and mortality.

Outside work

A little more of the person behind the work.

Wakeboarding Photography Learning C++ Travel

Contact

Interested in discussing engineering, distributed systems, AI, or opportunities? Feel free to get in touch.

thyll.muller@gmail.com +44 7706 746800 LinkedIn GitHub Request CV