Principal Python Developer

Contract Software Developer (Python/Django) – January Start Location: London (Hybrid – 2 days onsite per week) Contract type: Outside IR35 | Public Sector We are seeking an experienced Python/Django developer to join a public‑sector organisation in January. The role focuses on stabilising and modernising mature systems while contributing to a collaborative engineering environment. Essential Skills & Experience: Strong commercial background with Python and Django Solid PostgreSQL knowledge Experience with Celery or similar task‑queue technologies Comfortable with modernising mature codebases Excellent teamwork and communication skills Active UK security clearance required from day one Details: Start Date: January Location: Hybrid (2 days per week onsite) Engagement: Outside IR35 Software Developer Post‑Trade Automation (Ncounter) Funding a globally recognised systematic investment firm, Ncounter is hiring a Python‑focused developer for our Post‑Trade engineering group. The role delivers high‑performance components that automate the full lifecycle of post‑trade workflows. Core Requirements: Minimum 5 years Python experience in trading or post‑trade domains Proven data‑intensive services, PostgreSQL, and data‑frame tooling experience Background in trade booking and FIX protocol integration Design & implement scalable, high‑availability, distributed architectures Experience with reporting, reconciliation, large transactional datasets Understanding of OTC products (CDS, IRS, Variance Swaps) Highly Desirable: C++, Spark, Kafka or other distributed compute tools Position keeping, risk, or P&L systems exposure Strong debugging, profiling, optimisation across data pipelines Live & active security clearance from day one is required. The role starts in January and is Outside IR35 in the public sector. Software Developer – Server‑Side Python/Django (Public Sector) What You’ll Be Working On: Enhancing and maintaining a Python/Django application Database work (loads, optimisation, schema changes) with PostgreSQL Supporting a Celery‑based background task system Collaborating to streamline code and plan future enhancements What We’re Looking For: Hands‑on Python and Django experience Solid relational‑database knowledge, especially PostgreSQL Experience with Celery or similar task queues Interest in improving older systems Collaborative mindset within a team focused on incremental improvement Live & active security clearance required from day one Public sector environment Junior Java/Python Developer (Banking) We are working with a leading London bank to hire a junior developer experienced in both Java and Python for front‑office/ risk/ middle‑office environments. The role offers rotational exposure across teams. Contract Details: 12‑month contract initially Hybrid (London, up to 3 days a week onsite) Rate: up to £250 per day Experience Required: 1‑5 years in financial services Front‑office, risk, or middle‑office experience Java and Python coding ability Strong degree in engineering, CS, maths, or physics Lead Python Developer (Health Tech) Lead Python Developer (PYTHON/AWS/REACT) in a fast‑growing health tech company. The role involves design, implementation, and maintenance of publishing software and digital products, with technical supervision across the team. Main Accountabilities: Lead development and maintenance of software Promote high‑quality code and agile practices Collaboration with QA, product, and other leads Process improvement and technology adoption Recruitment and onboarding support Mentoring and coaching team members Communications up to executive level Knowledge & Skills: Leadership and delegation skills System design, testing, and operational stability Deep Python ecosystem knowledge with architectural insight Experience with agile (Scrum/Scrum‑like) Familiarity with front‑end (React) and RESTful APIs AWS services (Lambda, SQS, API Gateway, S3) Excellent communication and time‑management skills Senior Python Developer – FinTech FinTech company seeks a Senior Python Developer to join the engineering team. Responsibilities include designing complex systems and applications while optimizing performance. Required Skills: 6+ years commercial Python experience Flask or similar framework experience SQL expertise Cloud experience (AWS preferred) Computer Science/STEM degree from a top university Base salary £70k‑£90k, bonus up to 30% + stock options Remote‑first with central London office access All roles require an active UK security clearance and are advertised as Outside IR35 where applicable. Please contact the relevant recruiter for further details. #J-18808-Ljbffr