Python developer with visa Work, Jobs in London (with Salaries)

AI Research Engineer - Post-Training
SonarSource —London
- Doctoral degree
- Computer Science
- English
AI Platform Support Engineer (EMEA)
Lightning AI —London
- £75,000 - £95,000 a year
- Weekend availability
- Software troubleshooting
- Machine learning
- Computer networking
- Annual leave
Quick apply
Senior DevOps Engineering Manager
The Currency Cloud Services Limited —London
- DevOps
- Java
- Project management
Senior Backend Engineer
SumUp —London
- SQL
- AWS
- Banking
- Annual leave
- Life insurance
Quick apply
8d
Service & Operations Lead in SERVICE OPERATIONS
Bank of England —London
- £41,680 - £46,890 a year
- Full-time
- Hybrid work
- SQL
- Travel
- Scripting
- Annual leave
- Flexible schedule
Senior Cloud Engineer (K8S)
Graphcore —London
- Presentation skills
- Bachelor's degree
- No degree
- Annual leave
- Employee assistance programme
Staff Software Engineer (ML QA)
Graphcore —London
- Management
- Doctoral degree
- Computer Science
- Annual leave
- Employee assistance programme
Smart Automation Consultant - Power Platform
Talan —London
- Full-time
- Azure
- Salesforce
- JavaScript
Quick apply
DevOps Engineer - BPSS - Global Trading
Amber Labs —London
- Full-time
- Hybrid work
- DevOps
- SQL
- In-person
Quick apply
Senior Software Engineer (ML QA)
Graphcore —London
- Management
- Doctoral degree
- Computer Science
- Annual leave
- Employee assistance programme
Senior Cloud Network Engineer
Graphcore —London
- Presentation skills
- Bachelor's degree
- No degree
- Annual leave
- Employee assistance programme
Senior Cloud Platform Engineer
Graphcore —London
- Presentation skills
- Bachelor's degree
- No degree
- Annual leave
- Employee assistance programme
Lead DevOps (iOS)
Global Relay —London
- Hybrid work
- Management
- Python

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AI Research Engineer - Post-Training

SonarSource -
London

Apply Now

Job details

Qualifications

Cloud infrastructure
Rust (programming language)
Law
Doctoral degree
Computer Science
C#
English
Java
Master's degree
AWS
C++
Machine learning
JavaScript
GitHub
ServiceNow
IT
AI
Communication skills
Python

Full job description

Who is Sonar?

Sonar is driving the future of agent-centric software development. As the leader in AI code review and verification, we solve a critical problem: ensuring that software generated by AI-assisted developers or autonomous agents is reliable, secure, and maintainable.

Integrating seamlessly with Claude Code, Codex, Cursor, GitHub Copilot, Gemini, and Devin, we help over 75% of the Fortune 100 build trusted, reliable, compliant software. Customers who use Sonar are 44% less likely to report an outage due to AI-generated code.

We believe code verification is the critical missing link in the Agent-Centric Development Cycle (AC/DC). Industry giants like Nvidia, ServiceNow, Booking.com, Goldman Sachs, AstraZeneca, and Ford Motor Company count on us to provide independent, explainable, consistent review and governance of their AI-generated code via products like:

SonarQube: The world’s leading AI code review and verification platform.
SonarQube Foundation Agent: Currently topping the leaderboards for agentic software repair.
SonarSweep & Sonar Context Augmentation: Providing the enterprise-grade context and constraints agents need to be truly effective.

Our team operates across global hubs in Austin, Bochum, Dubai, Geneva, London, Singapore, Tokyo, and Washington D.C. We move with a mindset we call CODE:

Committed to our customers and community.
Obsessed with quality.
Deliberate in our decisions.
Effective as one team.

With over $400M in revenue and profitable, fast-paced growth, we are building the backbone of the AI software revolution. If you’re hungry to have an impact, want to build at a fast pace, and ready to work at the forefront of AI, we want to hear from you.

Position description

At Sonar, we are seeking an ambitious research engineer to join our cross-disciplinary team, innovating and developing the next generation of solutions to build enterprise-grade coding agents and models. You will harness Sonar’s deep experience in static analysis, and combine it with your experience and leading techniques in large language model post-training. If you are interested in being hands-on with state-of-the-art research, building practical solutions that deliver high-impact for customers, and working within a team of innovative researchers and engineers, this role is for you.

What you will do

Outcome Driven Development: Work in a team developing and implementing advanced products that enable customers to post-train models to power their agentic coding practices. These agents need to generate high-quality code that meets their enterprise standards and software development best practices.
Translate Prototypes to Products: Collaborate closely with researchers, research engineers, MLOps and Engineers within the team to design hypotheses and experiments, iterate proofs-of-concept quickly and develop successful prototypes into cutting-edge products.
Subject Matter Expert: You will contribute and discuss ideas within our cross-disciplinary team, driving towards the next generation of coding model post-training for enterprises.
Spearhead Research & Innovation: Stay up-to-date with the latest LLM and agentic developments; you are driven by learning and teaching others. You will need to explain complex technical details and concepts to both technical and non-technical audiences.

Experience and qualifications

The ideal candidate will have:

An advanced academic background (Master’s or PhD) in Computer Science, Machine Learning, or a related quantitative field.
Strong industry experience in machine learning, with a solid understanding of modern software engineering practices and tools.
Fluency with Python including core ML frameworks, experience with Rust or any of SonarQube’s flagship languages (C#, C++, JS/TS, Java) is a plus.
Expertise in post-training of AI models, with techniques such as:
- Reinforcement learning from verifiable rewards
- GRPO and related techniques
- Offline or semi-online reinforcement learning
- Parameter efficient fine-tuning
- Supervised fine-tuning
- Safety Alignment
Experience with large-scale data processing frameworks and cloud infrastructure (e.g. AWS, Microsoft Foundry, Databricks).
Experience of driving research projects, delivering valuable findings and prototypes, and then converting them into products.
Excellent communication skills in English and a talent for explaining complex scientific topics clearly and concisely.

We value diversity, equity, and inclusion

At Sonar, we believe that our diversity is our strength. We are a global company that values and respects different backgrounds, perspectives, and cultures. We are committed to fostering a diverse and inclusive work environment where everyone feels valued and empowered to contribute their best. We are proud to be an equal opportunity employer and welcome all qualified applicants, regardless of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.

If you need any accommodation, please reach out to us at [email protected].

All offers of employment at Sonar are contingent upon the results of a comprehensive background check and reference verification conducted before the start date.

We do not currently support visa candidates in the US.

Applications that are submitted through agencies or third party recruiters will not be considered.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

Apply Now

Refine Your Search

python developer with visa jobs in london

AI Research Engineer - Post-Training

AI Platform Support Engineer (EMEA)

Senior DevOps Engineering Manager

Senior Backend Engineer

Service & Operations Lead in SERVICE OPERATIONS

Senior Cloud Engineer (K8S)

Staff Software Engineer (ML QA)

Smart Automation Consultant - Power Platform

DevOps Engineer - BPSS - Global Trading

Senior Software Engineer (ML QA)

Senior Cloud Network Engineer

Senior Cloud Platform Engineer

Lead DevOps (iOS)

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