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About the Role

Thought Machine is building the backbone of critical banking infrastructure worldwide, empowering financial institutions to modernize their operations. In this high-stakes environment, producing quality software is a fundamental imperative. We are seeking a Senior Software Engineer to drive quality engineering excellence, modern testing architecture, and scalable infrastructure across our product engineering organization. This is a hands-on backend software engineering position focused on building intelligent, automated infrastructure and AI-driven developer tooling.

Responsibilities

Design, build, research, evaluate and adopt advanced engineering tools, including leveraging Agentic AI for automated triage of performance test failures, automated test-code generation, and eliminating developer toil.
Develop and integrate quantitative product reliability metrics for test coverage, execution speed and defect prevention into CI/CD pipelines.
Build telemetry and infrastructure for advanced testing paradigms, including deterministic fault injection to catch concurrency and race conditions.
Partner with engineering teams to conduct risk analyses, implement integration and performance testing strategies, and resolve complex edge-case defects.
Develop high-quality, testable, and robust backend services, APIs, and microservices in alignment with architecture standards.
Mentor junior and mid-level engineers in test automation patterns, backend engineering design, unit/integration testing strategies, and code hygiene.

Requirements

Extensive hands-on experience in backend software development using modern languages (e.g., Go, Python) and cloud-native architecture.
Proven track record of designing and implementing scalable backend platforms, with deep expertise in CI/CD integration, containerisation, and orchestration (e.g., GitHub Actions, GitLab CI, Docker, Kubernetes).
Deep understanding of complex distributed systems, API protocols (REST/gRPC), and observability stacks (e.g., Prometheus, Grafana, BigQuery).
Familiarity with leveraging modern AI-assisted tools and building agentic workflows for code generation, log analysis, and automated triage.
Excellent communication and stakeholder management skills to advocate for quality initiatives and influence cross-functional technical teams.

Skills

Backend software development
Modern languages (e.g., Go, Python)
Cloud-native architecture
CI/CD integration
Containerisation
Orchestration (e.g., GitHub Actions, GitLab CI, Docker, Kubernetes)
Complex distributed systems
API protocols (REST/gRPC)
Observability stacks (e.g., Prometheus, Grafana, BigQuery)
AI-assisted tools
Agentic workflows
Code generation
Log analysis
Automated triage
Test automation patterns
Backend engineering design
Unit/integration testing strategies
Code hygiene

Location

London
New York
Singapore
Sydney
Lisbon

Work Type

Full-time
Hybrid

Experience Level

Senior

Salary/Compensations

Highly competitive salary

Benefits

Pension plan (match up to 5%)
Life insurance - three times annual salary
Competitive maternity (six months fully paid) and paternity leave (four weeks fully paid)
Shared parental leave (matched to our maternity leave for the same point in time)
25 days holiday and bank holidays
Flexible working hours
Cycle-to-work scheme
Electric car scheme
Season ticket loan
Access to outstanding learning materials and courses
Sports and hobby clubs, subsidised by Thought Machine
All the latest tech you need
Fresh fruit and cereals
Huge range of healthy (and not-so-healthy) snacks, smoothies and drinks
A talented and experienced team as your colleagues
An environment where we encourage learning and progress
Two charity days a year
Weekly food pop-up

About the Company

Thought Machine's mission is bold – to properly and permanently rid the world's banks of legacy technology.
We have developed the foundations of modern banking through core and payments technology which run natively in the cloud.
We have grown rapidly, growing our team to more than 550 individuals across offices in London, New York, Singapore, Sydney and our newly established Engineering Hub in Lisbon.
We have raised more than £500m in funding and our investors include Molten Ventures, Eurazeo, Intesa Sanpaolo, Temasek, Nyca Partners, JPMorgan Chase Strategic Investments, Standard Chartered Ventures, and more.
We have created a culture that enables our team to produce the best work in the industry while ensuring we have fun along the way.
We're regularly cited as having a fantastic workplace culture and have been recognised by Sifted magazine as having one of the highest Glassdoor ratings for a UK fintech company and the industry's most generous employee share package.
Named one of the world's most innovative fintechs by Global Finance Magazine, we were also recognised by the Financial Times as one of Europe's fastest-growing companies for two consecutive years—and a UK Best Employer for 2026.

Equal Opportunity

We actively hire candidates who demonstrate technical excellence in their field and welcome people of all ages and backgrounds, providing everyone with equal access to professional development.
You are encouraged to apply even if your experience doesn't accurately match the job description.
We also encourage applications from those with different abilities, including candidates with ADHD, autism, dyslexia or dyspraxia.