Freelance Senior Full Stack Developer Jobs

New

Freelance Tech Lead

Freelance Tech Lead for an International Life Sciences Innovation client. The pr...

Location

Spain , Barcelona

Salary:

Not provided

Blu Selection

Expiration Date

Until further notice

Requirements

Proven experience as a Tech Lead, Lead Engineer, or Senior Full-Stack Developer
Strong understanding of modern web architectures, cloud platforms, and API integrations
Experience leading cross-functional engineering teams
Solid understanding of Agile methodologies and iterative delivery
Ability to make architectural decisions and communicate them clearly
Excellent communication and leadership skills
Fluency in English (French is a plus)
Availability to work onsite in Barcelona 3 days/week

Job Responsibility

Define the technical architecture, frameworks, and tools for the platform
Ensure strong scalability, performance, security, and reliability
Evaluate technical options and make strategic recommendations
Oversee and guide the engineering team throughout the development cycle
Ensure timely delivery of Version 1 in alignment with the March deadline
Review code, ensure development best practices, and maintain high-quality standards
Coordinate integrations with internal systems, APIs, and data flows
Work closely with the Product Owner, UX Designers, and Researchers to align technical decisions with user and business needs
Translate product requirements into clear technical specifications
Identify risks, dependencies, and propose mitigation plans

What we offer

Lead the technical delivery of a high-visibility digital platform
Work with a multi-disciplinary international team
Contribute to innovation in the life sciences sector
Freelance contract with a Daily Rate of 675€

New

Bar & floor crew

At BrewDog, we have one mission: to make other people as passionate about great ...

Location

Sweden , Malmo

Salary:

Not provided

BrewDog

Expiration Date

Until further notice

Requirements

At least 3 years of table service experience
Strong English is a must
Swedish is a big plus
Confident, reliable, and comfortable in a busy service environment

Job Responsibility

Deliver an amazing beer and customer experience every shift
Work on the floor and at the bar
Focus on great service, great atmosphere, and doing things properly

What we offer

Profit share
Staff discount
Customer service incentive scheme
4-week sabbatical every 5 years
Beer training
Enhanced sick pay
Life assurance
Employee assistance programmes
Enhanced family friendly policies around maternity and paternity leave
Additional holiday days per year

Parttime

New

SEM Operations Lead, Paid Search Activation

The U.S. Consumer Cards organization delivers a wide array of credit card servic...

Location

United States , New York

Salary:

163600.00 - 245400.00 USD / Year

Citi

Expiration Date

December 30, 2025

Requirements

10+ years of hands-on keyboard experience in Search Engine Marketing (SEM)
Significant portion dedicated to leading large-scale execution and delivery programs within a complex, regulated environment, especially in a leadership capacity
Proven experience managing execution teams and large-scale SEM budgets, consistently driving substantial performance improvements (e.g., ROAS, conversion rates)
Proven ability to lead operational transformation in high-budget, highly regulated industries, such as financial services
Mastery of Google Ads, Microsoft Ads, SA360, Adobe Analytics, Looker Studio, GA4, GTM, and related workflow tools
Deep expertise in major SEM platforms, advanced bid management strategies, and automation tools
Strong understanding of digital analytics, attribution modeling, A/B testing, and data visualization tools
Exceptional strategic thinking, problem-solving, and analytical skills, with the ability to translate complex data into actionable insights
Extensive experience with risk management, compliance frameworks, and navigating regulatory landscapes, especially within financial services
Excellent communication, presentation, and interpersonal skills, with the ability to influence and collaborate effectively at all levels of an organization

Job Responsibility

Own and lead hands-on keyboard set up and execution of all SEM/paid search campaigns, from initial build through end-to-end flight
Lead a large, hands-on keyboard campaign execution team responsible for building and trafficking campaigns, performing QA and managing large budgets, pacing, QA and reporting, ensuring consistency across multiple lines of business
Build and enforce a standardized QA framework covering bulk sheets, pre-live and post-live validations and end-to-end campaign delivery checklists, with strict adherence to Citi risk and controls framework
Establish SLAs for campaign launches, trafficking updates and invoice reconciliation to ensure zero operational risk
Create and own playbooks for execution tasks, ensuring continuity across all lines of business, accounts and product lines
Oversee the creation and approval of insertion orders, credit line management, billing reconciliation, and pacing controls
Ensure flawless trafficking of ad copy, creative rotations, sitelinks, end-to-end tracking and audience lists
Partner with Legal, Risk, and Compliance teams to uphold stringent advertising standards, including disclosures, disclaimers, and data privacy adherence
Identify opportunities to implement workflow automation, process tools, and AI solutions to enhance efficiency and reduce manual errors
Establish KPIs such as campaign launch accuracy, error rate reduction, and speed-to-market

What we offer

medical, dental & vision coverage
401(k)
life, accident, and disability insurance
wellness programs
paid time off packages, including planned time off (vacation), unplanned time off (sick leave), and paid holidays
discretionary and formulaic incentive and retention awards

Fulltime

!

New

Data Engineer

Join us as a Data Engineer at Barclays where your role will focus on building da...

Location

United Kingdom , Glasgow

Salary:

Not provided

Barclays

Expiration Date

Until further notice

Requirements

Experience with Python
Experience with AWS Glue
Experience with Athena
Experience with S3
Experience with VPC
Experience with Redshift
Knowledge of dbT
Knowledge of Snowflake
Knowledge of Databricks
To be assessed on key critical skills such as risk and controls, change and transformation, business acumen strategic thinking and digital and technology, as well as job-specific technical skills

Job Responsibility

Build and maintenance of data architectures pipelines that enable the transfer and processing of durable, complete and consistent data
Design and implementation of data warehoused and data lakes that manage the appropriate data volumes and velocity and adhere to the required security measures
Development of processing and analysis algorithms fit for the intended data complexity and volumes
Collaboration with data scientist to build and deploy machine learning models
To advise and influence decision making, contribute to policy development and take responsibility for operational effectiveness
Lead a team performing complex tasks, using well developed professional knowledge and skills to deliver on work that impacts the whole business function
Consult on complex issues
providing advice to People Leaders to support the resolution of escalated issues
Identify ways to mitigate risk and developing new policies/procedures in support of the control and governance agenda
Take ownership for managing risk and strengthening controls in relation to the work done

What we offer

Competitive holiday allowance
Life assurance
Private medical care
Pension contribution

Fulltime

New

Data Engineer

Join us as a Data Engineer at Barclays, responsible for supporting the successfu...

Location

India , Pune

Salary:

Not provided

Barclays

Expiration Date

Until further notice

Requirements

Proficiency in Ab Initio (GDE, EME, Co-Operating System) for graph development, debugging, and performance tuning
Ability to write and debug shell scripts for job orchestration
Querying skills for data extraction, transformation, and validation
Familiarity with Tivoli Workload Scheduler (TWS) or similar
Exposure to SIT, E2E, and OAT testing cycles
Experience with JIRA for sprint planning, backlog grooming, and delivery tracking
Should be able to write test cases and execute testing scenarios
Collaborate with architects, analysts, and QA teams to ensure data quality and system stability
Participate in code reviews, peer testing, and production deployments
Maintain documentation and support audit and compliance requirements

Job Responsibility

Supporting the successful delivery of Location Strategy projects to plan, budget, agreed quality and governance standards
Spearhead the evolution of our digital landscape, driving innovation and excellence
Harness cutting-edge technology to revolutionize our digital offerings, ensuring unparalleled customer experiences
Design and implement scalable ETL solutions for real-time and batch data processing
Build and maintenance of data architectures pipelines that enable the transfer and processing of durable, complete and consistent data
Design and implementation of data warehoused and data lakes that manage the appropriate data volumes and velocity and adhere to the required security measures
Development of processing and analysis algorithms fit for the intended data complexity and volumes
Collaboration with data scientist to build and deploy machine learning models
To perform prescribed activities in a timely manner and to a high standard consistently driving continuous improvement

What we offer

Competitive holiday allowance
Life assurance
Private medical care
Pension contribution

New

Data Engineer

You'll spearhead the evolution of our digital landscape, driving innovation and ...

Location

India , Pune

Salary:

Not provided

Barclays

Expiration Date

Until further notice

Requirements

Experience in Microsoft SQL
Experience in Microsoft SSIS
Experience in Python
Minimum Qualification – bachelor’s degree

Job Responsibility

Build and maintenance of data architectures pipelines that enable the transfer and processing of durable, complete and consistent data
Design and implementation of data warehoused and data lakes that manage the appropriate data volumes and velocity and adhere to the required security measures
Development of processing and analysis algorithms fit for the intended data complexity and volumes
Collaboration with data scientist to build and deploy machine learning models

What we offer

Competitive holiday allowance
Life assurance
Private medical care
Pension contribution

Fulltime

New

Corporate Salesperson

The Corporate Salesperson is a strategic professional who stays abreast of devel...

Location

Singapore , Singapore

Salary:

Not provided

Citi

Expiration Date

Until further notice

Requirements

4-10 years of experience
Previous experience in client-facing roles with proven track record on growing and maintaining relationships through value added service and commercial skills
An entrepreneurial approach for business origination and developing new relationships
Demonstrated interpersonal skills
Working knowledge of financial accounting principles, company balance sheets and understanding of corporate finance
Strong analytical skills, with an eye for details coupled with good oral/written communication skills
Strong interpersonal skills and a good team player who is flexible and adaptable, able to work within a dynamic team
Comfortable handling multiple tasks, projects, initiatives simultaneously in a timely manner
Self motivated individual, highly resourceful
Sets and achieves results with minimum support and is decisive

Job Responsibility

Deliver best in class solutions to clients across FX, FX options, Risk Management Solutions and originate multi asset opportunities mainly for China Parented Names incorporated in Singapore
Understand and analyze clients’ businesses and exposures to provide best suited sales solutions in full coordination with all relevant business partners
Work in close liaison with the coverage banker team to deliver a coordinated business strategy across products, clients and delivery channels
Achieve ambitious personal and team goals in both market and wallet share from the identified client franchise, originate and execute meaningful and landmark transactions
Assist clients on non-market risk management challenges, for example, balance sheet, cash-flow/earnings risk analysis and strategic, episodic driven hedging discussions
Develop a deep and broad personal “trusted advisor” relationship with primary clients, aiming to a foster a strong relationship with key top-level decision makers
Fostering an environment of collaboration through interfacing with appropriate internal partners to enhance share of mind with clients, increase dialogue and to deliver on expertise
Strive to deliver efficient FX execution solutions and to increase E-penetration
Appropriately assess risk/reward of transactions when making business decisions, demonstrating proper consideration for the firm’s reputation
Ensure all desk activities are carried out in compliance with all applicable laws and regulations, including internal Citi policies, and to the highest ethical standards

Fulltime

New

Maintenance Engineer

The Maintenance Engineer will be responsible for the smooth operation of all pla...

Location

United Kingdom , Ellon

Salary:

Not provided

BrewDog

Expiration Date

Until further notice

Requirements

SVQ Level 3 in Engineering or equivalent qualification
Proven experience in a maintenance role within the food and beverage or a similar high-paced manufacturing environment
Demonstrated ability to interpret technical documentation and drawings
Hands-on experience in troubleshooting and resolving mechanical, electrical, and automation failures
Knowledge of PLCs, automation systems, and control systems is highly desirable
Familiarity with food safety standards, GMP (Good Manufacturing Practices), and HACCP
Strong understanding of food safety regulations (e.g., HACCP) and industry best practices
In-depth knowledge of mechanical, electrical, and automation systems
Familiarity with Maintenance Management Systems (CMMS) for tracking maintenance activities and work orders
Strong problem-solving abilities and diagnostic skills

Job Responsibility

Perform preventive and reactive maintenance troubleshooting as required to resolve automation, electrical, mechanical, pneumatic and hydraulic issues on site machinery and equipment as determined by the Maintenance Delivery Manager
Ensure all work adheres to the sites HSEQ procedures, policies and standards
Conduct task risk assessments and follow health, safety, and environmental policies
Assist with the installation, commissioning, and modification of equipment
Interpret technical drawings and documentation for troubleshooting and repairs
Maintain accurate maintenance records and provide reports to the Maintenance Delivery Manager
Attend safety, production and team meetings as required
Work and communicate closely with other engineering teams and the production teams to ensure efficient operations
Ensure detailed hand backs and handovers are completed for every task and end of shift
Participate in training identified by the business to meet legislation, enhance skills and knowledge

What we offer

Bonus scheme
Pension enhancements up to 10%
4-week sabbatical every 5 years
Staff discount
Extra holiday day each year
Additional pay for each beer exam passed
Enhanced sick pay
Healthcare
Life assurance
High street retail discounts

Fulltime

Freelance Senior Full Stack Developer

Blu Selection

Location:
Spain , Barcelona

Category:
IT - Software Development

Contract Type:
B2B

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:
December 27, 2025

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Job Description:

Job Responsibility:

Requirements:

Nice to have:

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Job Posted:December 27, 2025

Looking for more opportunities? Search for other job offers that match your skills and interests.

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Job Posted:
December 27, 2025