Staff Front End Engineer - Ledger Enterprise Services (f/m)

I am Sadr, CEO of Oferli. We are building a high-performance, elite technical team, and I am looking for 5 to 10 dedicated founding technical partners to join me in this mission.
​The Vision:
Oferli is a 100% decentralized ecosystem. While we are rooted in Web3, our expertise spans across professional web and mobile application development. We are not just another agency; we are crafting the next generation of digital solutions. Our goal is to set a new standard for excellence, transparency, and decentralization.
​What I am looking for:
I am building a professional, senior-level "Elite Team." I am looking for partners who are truly passionate about the vision—not just short-term gains. By combining our individual expertise and portfolios, we will establish Oferli’s collective professional reputation.
​Requirements:
​Proven Expertise: You must be a senior-level professional. Please provide your portfolio showcasing your best work in web and mobile development.
​Commitment: This is a founding partnership. We are looking for those who believe in the mission and are ready to tackle complex challenges together.
​Professionalism: We operate with high standards. Communication and efficiency are key.
​How We Work:
​Collaboration: We use professional, secure channels for all communications. Qualified candidates will be contacted via email to be invited to our private workspace on Notion to align on our roadmap and launch our upcoming projects.
​Decentralized Operations: We leverage Web3 tools for collaboration and compensation, maintaining a fully decentralized environment.
​Growth: We are launching with a core team of at least 5 founding partners, scaling to 10, to deliver high-impact results for our clients.
​Application Process:
If you are a senior professional ready to build a world-class, decentralized ecosystem, apply here on LaborX. Qualified candidates will be contacted via email for further professional vetting and onboarding.
​Let’s build the future, together.
​Sadr B
CEO, Oferli

Our client is seeking a backend engineer to assume full responsibility for core functionalities on their medical imaging platform. In this role, you will not just hand off your code at the pull request stage but will be directly accountable for system accuracy, production stability, and the security of clinical data that impacts patient care directly.

The data science team creates machine learning models; your task is to create the robust, deterministic platform that supports them. Your responsibilities will include designing scalable architectures, resolving concurrency issues, ensuring seamless data migrations without downtime, and ensuring the stability of legacy services as their replacements are developed.

Responsibilities:

Full ownership of the technical roadmap of our Python/FastAPI ecosystem, encompassing API design, background task distribution, and production observability.

Manage and develop our PostgreSQL schema in terms of data integrity and persistence, including migrations, lock mechanisms, query optimization, and multi-tenant data isolation while adhering to HIPAA/PHI compliance.

Design and implement resilient image processing pipelines for handling intensive medical imaging files in asynchronous, event-driven workflows from ingestion and de-identification to model inference and result delivery.

Establish reliable API interfaces with frontend teams and clear model input/output contracts with data scientists to ensure a smooth cross-functional collaboration.

Keep thorough technical records, oversee the transition of legacy systems, and maintain Architecture Decision Records (ADRs).

Requirements:

Minimum of 5 years of software engineering experience with demonstrated production ownership and deep expertise in systems and backend fundamentals.

Proficiency in concurrency and distributed systems with a strong understanding of race conditions, deadlocks, idempotent processing, and messaging failure modes.

Hands-on experience with PostgreSQL internals and message brokers in a production environment.

Strong commitment to typed code, automated testing, CI/CD pipelines, Docker, and modern AI developer tools.

Ability to challenge requirements, set technical standards, and communicate effectively in both English and Chinese.

Nice-to-have Skills:

Familiarity with operating containerized workloads on Google Cloud Platform.

Direct experience with medical imaging workflows, DICOM standard protocols, or healthcare regulatory frameworks.

Knowledge of multi-tenant database patterns or deploying hybrid cloud/on-prem solutions.

Exposure to scientific computing contexts like NumPy, computational geometry, or frontend technologies like React/TypeScript.

Certain AI tools may be utilized in the hiring process for tasks such as application review and assessing candidate materials. These tools assist but do not replace human judgment, with final hiring decisions being made by humans. For more information on data processing, please contact us directly.

Are you ready to advance your international career? If so, we are here to guide you!

Ubiminds is a forward-thinking company that prioritizes its people and collaborates with American software product enterprises to expand their global teams. We carefully select top talent from Latin America and match professionals with enduring, impactful opportunities while delivering full support as an employer-of-record.

We are currently seeking a skilled Senior Fullstack Developer who enjoys tackling complex technical hurdles, constructing robust backend systems, and developing responsive web applications. As a key contributor in this role, you will be instrumental in the design, expansion, and upkeep of essential platform features and web interfaces utilized by millions of learners and institutions worldwide.

Job Challenges:

In this position, you will embark on significant career-enhancing endeavors, refining your expertise and contributing to a team that values continuous improvement, technical ownership, and ongoing learning.

As a Senior Developer, your responsibilities will entail designing, constructing, and maintaining high-capacity backend services and user interfaces throughout the product ecosystem. Leading technical initiatives spanning across multiple sprints, producing precise technical specifications, coding in C# and JavaScript/TypeScript, and utilizing AWS infrastructure to ensure platform reliability will be part of your daily tasks.

Additionally, you will have the chance to mentor team members, collaborate with product and support teams, and actively engage in projects that embody our core values and raise engineering standards across all departments.

Responsibilities:

Software Engineering & Architecture: Produce top-tier code in C# for backend services and JavaScript/TypeScript for web applications, emphasizing scalable and fault-tolerant component architectures and APIs.

Technical Design & Planning: Craft detailed technical specs for multi-sprint projects, including cost estimations and architectural assessments, while actively seeking peer feedback during technical design evaluations.

Cloud Architecture & Integration: Develop and deploy services leveraging Amazon Web Services (AWS), working alongside DevOps and Cloud teams to ensure optimal performance and security.

Code Quality & Technical Standards: Participate in code reviews, enforce coding standards, and maintain robust test coverage across the codebase.

Mentorship & Collaboration: Guide mid-level and junior developers, promote a culture of technical rigor, and collaborate across departments to deliver customer-centric features.

Customer Empathy & Operational Support: Collaborate with support teams to address complex technical escalations, maintaining a deep understanding of customer needs and product usage.

Mandatory Skills:

Proficiency in Advanced English level

Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent industry experience

4+ years of professional software engineering experience in delivering complex customer-facing applications

Strong skill set in C# or Java, with a good transition capability to C#, and proficiency in object-oriented design principles

Proficiency in JavaScript and contemporary frameworks like TypeScript, Node.js, React

Strong knowledge of Amazon Web Services (AWS) core services and cloud infrastructure

Deep understanding of core CS fundamentals

Effective communication skills, both written and verbal

Nice to Have:

Experience with modern front-end frameworks like React and building single-page applications

Proven experience in developing and maintaining public or enterprise RESTful APIs and microservices

Background in high-scale SaaS or cloud platform environments

Familiarity with educational software ecosystems and enterprise integration standards like SAML, OAuth2, LTI

Team & Environment:

International, distributed engineering team

Ownership-driven culture, where engineers lead solutions from start to finish

Focus on modernization, automation, and enhancing developer experience

Ample autonomy to suggest and implement enhancements

Collaborative setting with significant impact on engineering efficiency.

About Ubiminds:

Our Culture:

People-First: Focus on people as the top priority

Challenge Yourself: Embrace continuous improvement and self-challenge

Make It Happen: Ready to tackle challenges with a dedicated attitude

We're in This Together: Teamwork, growth, and evolution as a collaborative entity

Averaging on Awesome: Commitment to exceeding expectations with high-quality service

Keep It Real: Guaranteeing honesty, transparency, and openness across all scenarios

Perks and Benefits:

Placed within a product-based company with equivalent employee treatment

Full back-office support, from career guidance to concierge services

Remote-first policy for a distributed team

MacBook provided, no need for a personal device

Access to growth opportunities through technology-focused events and interactions

English improvement programs for free

Candidate referral bonus opportunity

On-site headquarters available for use, equipped with amenities for a comfortable workspace.

About Merkle Science

Merkle Science specializes in providing solutions for blockchain transaction monitoring and intelligence. These tools are utilized by various entities ranging from web3 companies to law enforcement to detect and prevent illicit activities involving cryptocurrencies. The ultimate goal is to establish a safe environment for cryptocurrency transactions and foster compliant growth within the industry.

Merkle Science has a strong presence in multiple global locations, including New York, Singapore, Bangalore, and London. The team comprises professionals with diverse backgrounds from reputable companies such as Bank of America, Paypal, Luno, Thomson Reuters, and Amazon. With significant funding from various investors, the company is well-positioned for growth and success.

Team: Product Engineering (Frontend)
Duration: 1 year
Work Mode: Hybrid, preferring a mix of office and remote work
Post-internship: Exceptional performers may be considered for a full-time position with a defined service commitment period.

Role Overview:

In this role, you will be responsible for developing user-facing features for web applications, including dashboards, investigation workflows, and compliance tools essential for daily operations by analysts and investigators.

Responsibilities:

Develop responsive and high-performing UI components using ReactJS

Transform design concepts into reusable and clean components

Integrate frontend applications with backend REST APIs

Manage application state efficiently and enhance rendering performance

Write well-structured, maintainable, and tested frontend code

Required Skills:

Strong knowledge of JavaScript (ES6+), HTML, and CSS

Proficiency in React, including component lifecycle, hooks, and state management

Ability to consume REST APIs and handle asynchronous data

Basic understanding of responsive design principles and cross-browser compatibility issues

Experience with collaborative development workflows using Git

Excellent problem-solving skills

Preferred Skills:

Experience with TypeScript

Familiarity with state management libraries like Redux, Zustand, React Query

Knowledge of charting/visualization libraries such as D3 or Recharts

Portfolio, GitHub profile, or personal projects demonstrating UI expertise

Exposure to AI tools beneficial for coding and design tasks

Eligibility Requirements:

Final year B.Tech/B.E./Dual Degree students graduating in 2027

Limited to candidates from IIT / NIT / IIIT with a specialization in CSE, IT, or closely related fields

Strong academic background with demonstrated coding and UI skills

Preference given to those with open-source contributions, personal projects, and prior internship experience

Selection Process:

Initial resume screening based on eligibility criteria

Online coding assessment covering DSA and role-specific fundamentals

Technical interviews with the engineering team

HR discussion and potential offer

How to Apply:

Interested candidates should submit their updated resumes to the provided email address with the specified subject line referencing the internship position and their college name.

Well-Being, Compensation, and Benefits:

Merkle Science emphasizes employee well-being by offering comprehensive health insurance, flexible time off, learning initiatives, and a balanced work environment. The company encourages team-building activities and open discussions on mental health topics.

Recognizing and rewarding talent is paramount at Merkle Science. Competitive compensation packages along with equity opportunities are provided, offering avenues for career advancement within a rapidly growing organization.

Please note that artificial intelligence (AI) tools may be utilized in the hiring process to support recruitment activities. While these tools aid in the assessment of applications, the final hiring decisions are made by human evaluators based on the provided information.

Our client, an established proprietary trading and technology firm, is seeking a qualified professional to join their engineering team in Taiwan. The firm operates at the intersection of quantitative research, trading strategies, and technology innovation. They are on the lookout for an experienced individual to lead the quality engineering strategy in their trading and research technology domain.

In this role, the ideal candidate will be responsible for spearheading the creation of automated testing frameworks, enhancing testing infrastructure, and elevating quality standards throughout the software development lifecycle. This position requires direct involvement in software engineering activities rather than conventional quality assurance duties. Collaboration with various teams such as software engineers, researchers, traders, and operations is key to understanding system complexities and implementing effective automated testing solutions.

Responsibilities:

Develop and take charge of automated test frameworks for backend services, APIs, and user-facing applications.

Enhance automated functional, integration, and performance testing capabilities.

Collaborate with different teams to define quality standards and requirements.

Identify gaps in existing test coverage and drive enhancements in the development process.

Advocate a proactive testing approach to detect issues early in development.

Participate in discussions on architecture and system design to optimize testability.

Ensure system correctness, reliability, and performance under high-throughput and low-latency scenarios.

Create testing tools and infrastructure rather than just writing or executing test cases.

Contribute to setting engineering standards and best practices related to automated testing.

Requirements:

Minimum of 5 years of experience in QA automation, SDET, or software test engineering.

Demonstrated expertise in building automation frameworks from scratch.

Proficiency in at least one of Python, TypeScript, Go, or C++.

Experience utilizing programming languages for test framework development and tooling.

Strong understanding of software testing methodologies and automation architecture.

Familiarity with integrating automated testing into CI/CD pipelines.

Previous exposure to trading, fintech, or financial technology sectors, ideally involving complex data-intensive systems.

Excellent communication skills and ability to collaborate effectively with engineering and research teams.

Preferred Qualifications:

Familiarity with Playwright, Pytest, or similar modern automation frameworks.

Experience in performance and load testing utilizing tools like k6 or Locust.

Background in systematic trading, quantitative finance, or crypto/Web3.

Knowledge of applying AI/LLMs to software testing and related areas.

Working knowledge of SQL and/or NoSQL databases.

Previous experience in testing data warehouses, data lakes, or streaming/data pipelines.

Understanding of observability and monitoring platforms such as Datadog or Grafana.