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5 senior software engineer jobs found

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senior software engineer £400 - £500 Greater London
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Duration not stated  (5)
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Contract Spy
May 29, 2026
Duration not stated
Senior Solidity Engineer at Test Yantra, London/Remote, £400 per day
£400 per day
Contract Spy Hybrid (London, UK)
Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial...
Contract Spy
May 27, 2026
Duration not stated
Data Engineer - SC Cleared at Softwire, London Area, £500-£600 per day (Outside IR35)
£500 - £600 per day
Contract Spy London Area, United Kingdom
Data Engineer - Outside IR35 - Contract - SC ESSENTIAL   A rare opportunity to join our fast-growing technology company selling high-value software development services. You will be working within a Government department as part of an existing team to support the rollout of a new Database.   Must have   Several years' experience with data modelling, data mapping, and defining data standards Experience working with complex, multi-organisation data landscapes Track record of delivering clarity in the presence of ambiguity Experience working with senior stakeholders to define strategy   Nice to have   Experience working with central and/or local government Familiarity with housing / property / regulatory datasets Experience implementing data standards that have already been defined   Your approach   You are passionate about delivering great technical quality, whether...
Contract Spy
May 21, 2026
Duration not stated
Senior Solidity Engineer at Test Yantra, London/Remote, £400 per day
£400 per day
Contract Spy London, UK
Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial...
Contract Spy
May 18, 2026
Duration not stated
Data Engineer - SC Cleared at Softwire, London, £500-£600 per day (Outside IR35)
£500 - £600 per day
Contract Spy London Area, United Kingdom
Data Engineer - Outside IR35 - Contract - SC ESSENTIAL   A rare opportunity to join our fast-growing technology company selling high-value software development services. You will be working within a Government department as part of an existing team to support the rollout of a new Database.   Must have   Several years' experience with data modelling, data mapping, and defining data standards Experience working with complex, multi-organisation data landscapes Track record of delivering clarity in the presence of ambiguity Experience working with senior stakeholders to define strategy   Nice to have   Experience working with central and/or local government Familiarity with housing / property / regulatory datasets Experience implementing data standards that have already been defined   Your approach   You are passionate about delivering great technical quality, whether...
Contract Spy
May 14, 2026
Duration not stated
Senior Solidity Engineer at Test Yantra, London/Remote, £400 per day
£400 per day
Contract Spy Hybrid (London, UK)
Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial...
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