Backend Developer Salary in London

Backend Developer jobs in London hiring now at vetted startups and product companies on Alion, updated daily. Average salary around $213,225/year. Compare remote, hybrid and on-site positions with relocation and visa sponsorship. Browse and apply today.

London
AI/ML
Data Science
Backend
Frontend
Mobile
DevOps
Web3
Games
Hardware
Robotics
Security
QA
Executive
Networking
Product
Design
Analytics
Support
Enterprise Apps
Quantum

Mistral AI

mistral.ai
Mistral AI is a French artificial intelligence company founded in Paris in 2023 by former researchers from Google DeepMind and Meta. It builds efficient open-weight and commercial large language models, including the Mistral, Mixtral, Magistral and Codestral families, and distributes them through its own developer platform as well as the major cloud marketplaces. Positioned as Europe's leading frontier model developer, the company also ships the Le Chat assistant, on-premise deployment options for regulated industries and a sovereign compute offering for customers who must keep data inside the region.
mistral.ai • HQ: Paris, France • Code Intelligence • Machine Learning • AI Agents • Artificial Intelligence • LLM & Generative AI • 1001-5000 employees • Est. 2023
HQ: Paris, France • Code Intelligence • Machine Learning • AI Agents • Artificial Intelligence • LLM & Generative AI • 1001-5000 employees • Est. 2023
Verified live · 1 hour ago 20 days ago

Software Engineer Network Automation, WAN & Edge

$54k – $103k per year (Estimated)In office (Paris, France, Amsterdam, Netherlands, Warsaw, Poland, Munich, Berlin, Germany) • Relocation • Full-Time
Go
DevOps
Ansible
Terraform
Kubernetes
Cybersecurity
FortiGate
Apply
Verified live · 1 hour ago 2 months ago

Software Engineer Network Automation, Data Center Fabrics

$49k – $92k per year (Estimated)ParisAmsterdamWarsawMunichLondon • Remote (Germany, France, United Kingdom, Netherlands, Poland) • Relocation • Full-Time
Go
AI/ML
InfiniBand
DevOps
Kubernetes
HPC
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Verified live · 1 hour ago 2 months ago

Research Software Engineer

$54k – $103k per year (Estimated)In office (Paris, France, Zurich, Switzerland, Warsaw, Poland, London, United Kingdom) • Relocation • Master's Degree • Full-Time
C++
Go
Java
Python
Rust
AI/ML
CUDA
CUDA Toolkit
DevOps
CI/CD
Kubernetes
SLURM
Apply
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Circle

circle.com
Circle is a global financial technology company best known as the issuer of USD Coin (USDC) and EURC, two of the world's leading fully backed digital stablecoins. Headquartered in New York City, New York, the firm builds open financial infrastructure and developer APIs that enable internet-native payment settlement, treasury management, and blockchain integration. By bridging traditional banking networks with public blockchain systems, it allows businesses worldwide to store, send, and trade digital value seamlessly.
circle.com • HQ: New York, United States • Financial Services • Stablecoins • Blockchain & Crypto • Est. 2013
HQ: New York, United States • Financial Services • Stablecoins • Blockchain & Crypto • Est. 2013
$130k – $140k per year • Senior • 5+ years exp • Remote • Senior
Ruby
TypeScript
JavaScript
Ruby
Ruby on Rails
Databases
MySQL
PostgreSQL
Frontend
Next.js
React.js
Tailwind CSS
Analytics
A/B Testing
Apply
$130k – $140k per year • Senior • 6+ years exp • Remote • Senior
Ruby
JavaScript
Ruby
Ruby on Rails
Databases
MySQL
PostgreSQL
AI/ML
AI Agents
LLM
RAG
Edge AI
Frontend
React.js
Analytics
A/B Testing
Apply
Report

Tether

tether.to
Tether is a digital asset company founded in 2014 that issues USDT, the largest stablecoin in circulation and the most heavily traded asset in crypto markets. Each token is intended to hold a one-to-one peg with the United States dollar and is backed by a reserve portfolio dominated by short-dated Treasury bills, with regular attestation reports published on the reserve composition. Headquartered in San Salvador, El Salvador, the group has expanded beyond stablecoin issuance into gold-backed tokens, Bitcoin mining, energy, peer-to-peer communications and local artificial intelligence infrastructure.
tether.to • HQ: San Salvador, El Salvador • Crypto Payments • Data Centers • Artificial Intelligence • Blockchain & Crypto • Cryptocurrencies • Stablecoins • 1001-5000 employees • Est. 2014
HQ: San Salvador, El Salvador • Crypto Payments • Data Centers • Artificial Intelligence • Blockchain & Crypto • Cryptocurrencies • Stablecoins • 1001-5000 employees • Est. 2014
$90k – $220k per year (Estimated) • Senior • Remote • Senior
Node JS
JavaScript
C++
AI/ML
Tokenization
Frontend
npm
Web3
Bitcoin
Apply
Verified live · 1 hour ago 3 months ago

Senior Software Architect (100% Remote - Worldwide)

$150k – $281k per year (Estimated) • Staff+ • 5+ years exp • Remote • Architect • English: B2
Node JS
JavaScript
AI/ML
Tokenization
Web3
Bitcoin
Ethereum
Smart Contracts
Token Standards
Apply
Verified live · 1 hour ago 3 months ago

Senior Software Architect (100% Remote - Worldwide)

$150k – $281k per year (Estimated) • Staff+ • 5+ years exp • Remote • Architect • English: B2
Node JS
JavaScript
AI/ML
Tokenization
Web3
Bitcoin
Ethereum
Smart Contracts
Token Standards
Apply
Report

GiveDirectly

givedirectly.org
GiveDirectly allows donors to send money directly to people in poverty with no strings attached. Our approach is guided by rigorous evidence of impact and our values of efficiency, transparency, and respect.
givedirectly.org • Kampala • Cleveland • New York • Washington • San Francisco • Financial Services • Crowdfunding • Est. 2008
Kampala • Cleveland • New York • Washington • San Francisco • Financial Services • Crowdfunding • Est. 2008
Open 493 daysVerified live · 1 day ago 1 year ago

Senior Software Engineer (Remote)

$90k – $218k per year (Estimated) • Senior • 4+ years exp • Remote (United States, United Kingdom, Kenya) • Internship • Senior • English
C#
Go
Java
Python
Ruby
DevOps
AWS
CI/CD
Apply
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Substack

substack.com
substack.com • New York • San Francisco • London • Content Creation • Media & Entertainment • Publishing
New York • San Francisco • London • Content Creation • Media & Entertainment • Publishing
Top 25% payVerified live · 2 days ago 20 days ago

Full Stack Software Engineer - Community

$140k – $260k per year • Senior • 7+ years expSan Francisco • Remote (United States, United Kingdom) • Full-Time • Senior
TypeScript
JavaScript
Databases
PostgreSQL
Frontend
React.js
Apply
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Coram AI

coram.ai
Coram AI is an artificial intelligence company that develops advanced AI-powered video security and surveillance software. Founded by engineers from Stanford and MIT, it integrates with existing IP cameras to provide real-time threat detection, automated alerts, and fast natural-language search across security footage. The platform serves commercial businesses, educational institutions, and enterprise facilities by transforming traditional physical security setups into proactive, intelligent monitoring systems.
coram.ai • HQ: San Francisco, United States • Artificial Intelligence • Cybersecurity • Computer Vision
HQ: San Francisco, United States • Artificial Intelligence • Cybersecurity • Computer Vision
Verified live · 4 hours ago 21 day ago

Software Engineer

$83k – $187k per year (Estimated)In office (London, United Kingdom) • Bachelor's Degree • Full-Time
C++
Go
Python
TypeScript
JavaScript
AI/ML
Claude
Computer Vision
Multimodal AI
Perplexity
AI Agents
Frontend
React Query
React.js
Tailwind CSS
Mobile
Clean Architecture
DevOps
AWS
Kubernetes
Pulumi
Apply
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Tessl

tessl.io
Tessl helps teams build AI-native software by giving coding agents structured, versioned context. Ship AI-powered systems that hold up in real codebases.
tessl.io • London • New York • San Francisco • Artificial Intelligence • Est. 2024
London • New York • San Francisco • Artificial Intelligence • Est. 2024
Verified live · 1 day ago 21 day ago

Member of Technical Staff - Software Engineer

$131k – $283k per year (Estimated) • Staff+ • 5+ years expIn office (London, United Kingdom) • Full-Time • Staff
C++
Haskell
JavaScript
Python
TypeScript
AI/ML
Edge AI
DevOps
Kubernetes
Rest API
GitHub
Apply
Report

Openhomefoundation

openhomefoundation.org
The Open Home Foundation fights for the principles of privacy, choice, and sustainability for smart homes. And for every person who lives in one. It does this by supporting the development of open source projects, and open connectivity and communication standards.
openhomefoundation.org • Wireless • Smart Home Devices
Wireless • Smart Home Devices
Verified live · 2 days ago 21 day ago

Senior Python Engineer

$66k – $187k per year (Estimated) • Senior • 5+ years exp • Remote (Europe) • Full-Time • Senior
Python
Python
Asyncio
AI/ML
llama.cpp
LLM
Model Context Protocol
Ollama
AI Agents
Edge AI
Function Calling
DevOps
Git
GitHub
IoT
Matter
Apply
Report

Customer.io

customer.io
Customer.io, legally Peaberry Software, Inc., is a customer engagement software company headquartered in Portland, Oregon, and founded in 2012. The company provides a platform that enables businesses to automate personalized messaging across email, SMS, push notifications, and in-app channels based on real-time customer behavior and data. Serving over 9,000 brands globally, the organization operates as a remote-first company with a focus on data-driven marketing automation and artificial intelligence integration for B2B and B2C enterprises.
customer.io • HQ: Portland, United States • Software • Customer Analytics • Data & Analytics • AI Agents • Artificial Intelligence • Sales & Marketing • Email Marketing • Marketing Automation • Est. 2012
HQ: Portland, United States • Software • Customer Analytics • Data & Analytics • AI Agents • Artificial Intelligence • Sales & Marketing • Email Marketing • Marketing Automation • Est. 2012
Open 151 dayTop 25% pay 5 months ago

Senior Software Engineer, Full Stack

$150k – $200k per year • Senior • 7+ years exp • Remote (AMER, EMEA) • Senior
Go
TypeScript
JavaScript
AI/ML
AI Agents
Frontend
React.js
Apply
Open 150 daysTop 25% pay 5 months ago

Senior Software Engineer, Backend

$150k – $200k per year • Senior • 7+ years exp • Remote (AMER, EMEA) • Senior
Go
Databases
MySQL
AI/ML
AI Agents
DevOps
AWS
GCP
Apply
Report

LiveKit

livekit.io
LiveKit is an open-source real-time audio, video, and AI voice infrastructure platform headquartered in San Francisco. The company provides cloud and developer infrastructure designed to build ultra-low-latency video conferencing, live streaming, and interactive multimodal AI voice agents into web and mobile applications. Powered by flexible SDKs and scalable server orchestration, LiveKit is widely used by developers and enterprise teams to deploy real-time voice and video applications at global scale.
livekit.io • HQ: San Francisco, San Jose, United States • Artificial Intelligence • AI Agents • Speech & Audio AI • Est. 2021
HQ: San Francisco, San Jose, United States • Artificial Intelligence • AI Agents • Speech & Audio AI • Est. 2021
Open 595 daysTop 25% pay 1 year ago

Software Engineer, Agents

$135k – $300k per year • Equity • Remote (EMEA, North America) • Full-Time
Python
TypeScript
AI/ML
AI Agents
LLM
LiveKit
OpenAI
Marketing
Salesforce
Apply
$167k – $313k per year (Estimated) • Equity • Staff+ • Remote (United States, United Kingdom) • Visa sponsorship • High School Diploma • Staff
Go
Databases
ClickHouse
NATS
AI/ML
Multimodal AI
LiveKit
OpenAI
DevOps
gRPC
Kubernetes
OpenTelemetry
Prometheus
GitHub
etcd
Apply
Top 25% payVerified live · 8 hours ago 2 months ago

Staff Software Engineer, Distributed Systems

$135k – $300k per year • Equity • Staff+ • Remote (EMEA, North America) • Full-Time • Staff
Go
Databases
ClickHouse
NATS
AI/ML
Multimodal AI
LiveKit
OpenAI
DevOps
gRPC
Kubernetes
OpenTelemetry
Prometheus
GitHub
etcd
Apply
Report

Bitcoin

bitcoin.com
Bitcoin kopen, verkopen en opslaan, live crypto-nieuws en koersen volgen, en ontdekken hoe Bitcoin werkt — alles op één plek. Al meer dan 10 jaar een vertrouwde partner.
bitcoin.com • Warsaw • Dubai • DeFi • Blockchain & Crypto • Cryptocurrencies • Est. 2015
Warsaw • Dubai • DeFi • Blockchain & Crypto • Cryptocurrencies • Est. 2015
Verified live · 12 hours ago 21 day ago

Senior Software Engineer (L2)

$90k – $221k per year (Estimated) • Senior • 5+ years exp • Remote (Europe) • Bachelor's Degree • Contractor • Senior
Java
Kotlin
Rust
AI/ML
Claude
Claude Code
Mobile
Room
DevOps
AWS
CI/CD
Rest API
New Relic
Cybersecurity
PCI DSS
Web3
Bitcoin
Token Standards
QA
Sentry
Apply
Report

Raspberry Pi Foundation

raspberrypi.org
Raspberry Pi Foundation is a UK-based charity and company focused on enabling young people to realize their potential through computing and digital technologies. They provide free resources, training, and guidance to teach coding and computing to young people and educators. Their initiatives include Code Club, a global movement of coding clubs, and various projects like the Astro Pi Challenge.
raspberrypi.org • Minneapolis • Atlanta • Cambridge • EdTech Platforms • Education • STEM Education
Minneapolis • Atlanta • Cambridge • EdTech Platforms • Education • STEM Education
Verified live · 1 day ago 21 day ago

Staff Engineer

$89k – $100k per year • Staff+ • Remote (United Kingdom) • Staff
Node JS
Ruby
JavaScript
Ruby
Ruby on Rails
Databases
PostgreSQL
Frontend
React.js
DevOps
AWS
CircleCI
Cloudflare
Heroku
Terraform
Apply
Report

Mercor

mercor.com
Mercor is an artificial intelligence infrastructure company headquartered in San Francisco, California, and founded in 2023. The company operates a platform that connects a global network of domain experts, including physicians, lawyers, and engineers, with AI labs to provide high-quality data for reinforcement learning from human feedback (RLHF) and model evaluation. It develops specialized benchmarks like APEX to measure model performance on economically valuable tasks and provides enterprises with tools to monetize their workflow data for AI training.
mercor.com • HQ: San Francisco, United States • Professional Services • Data Collection • Data & Analytics • Reinforcement Learning • LLM & Generative AI • Artificial Intelligence • 501-1000 employees • Est. 2023
HQ: San Francisco, United States • Professional Services • Data Collection • Data & Analytics • Reinforcement Learning • LLM & Generative AI • Artificial Intelligence • 501-1000 employees • Est. 2023
21 day ago

Software Developer

$135k – $245k per year (Estimated) • Middle • 3+ years expSan Francisco • Remote (United States, United Kingdom) • Full-Time • Middle
C#
C++
Java
Python
Rust
TypeScript
AI/ML
LLM Evaluation
Apply
$120k – $222k per year (Estimated) • Junior • 2+ years expSan Francisco • Remote (United States, United Kingdom) • Full-Time • Junior
Claude
Claude Code
Cursor
Windsurf
OpenAI Codex
Apply
Report

Sophos

sophos.com
Sophos is a global leader in cybersecurity, providing businesses and individuals with a comprehensive range of solutions to protect against a wide range of cyber threats. Our products include endpoint protection, network security, and cloud security. Sophos is committed to providing our customers with the highest level of security and protection, and we are always innovating to stay ahead of the latest threats.
sophos.com • HQ: Oxford, United Kingdom • Internet Security Services • Managed Security • Information Security • Cybersecurity
HQ: Oxford, United Kingdom • Internet Security Services • Managed Security • Information Security • Cybersecurity
$54k – $129k per year (Estimated) • Junior • United Kingdom • Remote (United Kingdom) • Full-Time • Junior
CI/CD
Cybersecurity
Sophos
Apply
Report

NMI

nmi.com
NMI is a leading provider of payment processing solutions. The company's platform helps businesses accept payments from a variety of sources, including credit cards, debit cards, ACH, and more. NMI's platform offers a range of features, including: Payment gateway Merchant account Payment processing Fraud prevention Customer support NMI's platform is designed to be secure and reliable, with a focus on providing businesses with a seamless payment experience.
nmi.com • Cape Town • Bristol • FinTech • Financial Services • Payments
Cape Town • Bristol • FinTech • Financial Services • Payments
Verified live · 22 min ago 27 days ago

Senior Software Engineer

$80k – $152k per year (Estimated) • Senior • 6+ years exp • Remote (United Kingdom) • Senior
Go
PHP
DevOps
AWS
Cybersecurity
SOC 2
Apply
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Oyster

oysterhr.com
Opportunities for all Where you are shouldn't govern what you do. We're changing the way the world works—one brilliant remote hire at a time.
oysterhr.com • Austin • Toronto • Chicago • Charlotte • Denver • Professional Services • Human Resources
Austin • Toronto • Chicago • Charlotte • Denver • Professional Services • Human Resources
Verified live · 1 day ago 22 days ago

Senior Engineer (Platform)

Senior • 5+ years exp • Remote (EMEA) • Full-Time • Senior • English: C1
Ruby
Ruby
Ruby on Rails
DevOps
AWS
CI/CD
Datadog
Platform Engineering
Terraform
Heroku
QA
Sentry
Apply
Report

AssemblyAI

assemblyai.com
AssemblyAI is a developer focused company that provides speech and audio AI through an API. In practical terms, it helps software teams turn unstructured audio into text and structured information, such as transcripts, summaries, and other speech derived signals that can be used inside products and workflows. The core problem it addresses is that working with audio at scale is difficult and time consuming without reliable models and infrastructure, especially when teams need accuracy, speed, and an integration that is straightforward to maintain.
assemblyai.com • London • New York • San Francisco • Denver • Chicago • LLM & Generative AI • Speech & Audio AI • Artificial Intelligence
London • New York • San Francisco • Denver • Chicago • LLM & Generative AI • Speech & Audio AI • Artificial Intelligence
Top 25% payVerified live · 2 hours ago 2 months ago

Senior Forward Deployed Engineer

$135k – $203k per year • Equity • Senior • 4+ years expLondon • Remote (United Kingdom) • Senior
Python
SQL
AI/ML
LLM
Cybersecurity
GDPR
Apply
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Anza

anza.xyz
Anza is a software engineering and R&D firm dedicated to building core infrastructure, protocols, and developer tools for the Solana blockchain ecosystem. Founded in 2024 by executives and core engineers from Solana Labs, the firm focuses on enhancing network performance, reliability, and decentralization. Its major contributions include the Agave validator client - a major client fork designed to optimize block propagation and reduce latency - alongside core SDKs, token extension protocols, and infrastructure tooling for decentralized application developers.
anza.xyz • HQ: San Francisco, United States • Blockchain & Crypto • 201-500 employees • Est. 2024
HQ: San Francisco, United States • Blockchain & Crypto • 201-500 employees • Est. 2024
$180k – $300k per year • Senior • 3+ years exp • Remote (United States, Switzerland, United Kingdom) • Bachelor's Degree • Full-Time • Senior
C++
Rust
Web3
Solana
Bitcoin
Ethereum
Apply
Top 25% pay 2 months ago

Senior Software Engineer, Generalist

$180k – $300k per year • Senior • 3+ years exp • Remote (United States, Switzerland, United Kingdom) • Bachelor's Degree • Full-Time • Senior
C++
Rust
Web3
Solana
Bitcoin
Ethereum
Apply
Top 25% pay 2 months ago

Software Engineer, Security

$180k – $300k per year • Senior • 5+ years exp • Remote (United States, Switzerland, United Kingdom) • Full-Time • Senior
Rust
Cybersecurity
Defense in Depth
Web3
Smart Contracts
Solana
Cosmos
CosmWasm
NEAR
Apply
Report

Normal Computing

normalcomputing.com
Normal Computing is an artificial intelligence and semiconductor technology company headquartered in New York City, New York, and founded in 2022. The firm develops a full-stack platform including AI-native Electronic Design Automation software and thermodynamic Application-Specific Integrated Circuits designed to optimize AI inference and long-context reasoning. Backed by investors such as Samsung Catalyst, the company partners with major semiconductor manufacturers to deploy its co-design solutions for complex system-on-chip verification and hardware acceleration.
normalcomputing.com • HQ: New York, United States • Machine Learning • LLM & Generative AI • EDA • Software • Semiconductors • AI Infrastructure • Hardware • Artificial Intelligence • Est. 2022
HQ: New York, United States • Machine Learning • LLM & Generative AI • EDA • Software • Semiconductors • AI Infrastructure • Hardware • Artificial Intelligence • Est. 2022
Top 25% payVerified live · 1 day ago 22 days ago

Software Engineer, Agent Systems

$200k – $400k per year • Middle • 4+ years expRemote/Hybrid (New York, United States, London, United Kingdom, Zurich, Switzerland, Copenhagen, Denmark) • Full-Time • Middle
PostgreSQL
Redis
AI/ML
AI Agents
LLM
DevOps
Kubernetes
Platform Engineering
Apply
Top 25% payVerified live · 1 day ago 2 months ago

Software Engineer, Backend

$200k – $400k per year • Middle • 4+ years expRemote/Hybrid (New York, United States, London, United Kingdom, Copenhagen, Denmark) • Full-Time • Middle
PostgreSQL
Redis
DevOps
Kubernetes
Apply
Top 25% payVerified live · 1 day ago 2 months ago

Software Engineer, Product

$200k – $400k per year • Senior • 5+ years expRemote/Hybrid (New York, United States, London, United Kingdom) • Full-Time • Senior • Polish
Node JS
Python
TypeScript
JavaScript
AI/ML
AI Agents
Frontend
React.js
Apply
Report

ElevenLabs

elevenlabs.io
ElevenLabs is transforming human-technology interaction with AI research and products. Powering the best enterprises, creators, and developers. From ElevenAgents for customer experience, ElevenCreative for content creation, to the leading AI voice generator.
elevenlabs.io • HQ: New York, United States • HQ: London, United Kingdom • AI Agents • LLM & Generative AI • Artificial Intelligence • Speech & Audio AI • 51-200 employees • Est. 2022
HQ: New York, United States • HQ: London, United Kingdom • AI Agents • LLM & Generative AI • Artificial Intelligence • Speech & Audio AI • 51-200 employees • Est. 2022
$96k – $174k per year (Estimated) • Senior • 8+ years expIn office (London, United Kingdom) • Relocation • Bachelor's Degree • Full-Time • Staff
Python
AI/ML
AI Agents
ElevenLabs
Apply
Verified live · 1 hour ago 2 months ago

Website Growth Engineer

$81k – $182k per year (Estimated)London • Remote (United States, United Kingdom, Poland, Spain) • Full-Time
SQL
TypeScript
JavaScript
AI/ML
ElevenLabs
Frontend
React.js
Analytics
A/B Testing
Apply
Open 553 daysVerified live · 1 hour ago 1 year ago

Full-Stack Engineer (Back-End Leaning)

$83k – $186k per year (Estimated)New YorkAmsterdamWarsawMadridSofia • Remote (United States, Germany, United Kingdom, Bulgaria, Ireland) • Full-Time
Python
AI/ML
ElevenLabs
DevOps
Kubernetes
GitHub
Apply
Report
Backend Developer Salary in London
Frequently asked questions
How many Backend Developer jobs in London are available on Alion?
There are currently 682 active listings from 259 hiring companies on Alion, refreshed daily.
What salary do Backend Developer jobs in London pay?
The average salary is around $213,225 per year based on the current listings.
Are remote options available for Backend Developer jobs in London?
Yes, many of these roles offer remote or hybrid work, and you can filter listings by remote, relocation and visa sponsorship.
How do I apply for Backend Developer jobs in London?
Open any listing on Alion and apply directly with the employer through the provided link - no lengthy sign-up required.